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[Member] Other Commitments [Axis] Other Commitments [Axis] Loans held for investment Financing receivable, gross Total Total Financing Receivable, before Allowance for Credit Loss Income before provision for income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Shareholders’ equity Stockholders' Equity Attributable to Parent [Abstract] Cumulative Effect, Period of Adoption [Domain] Cumulative Effect, Period of Adoption [Domain] Securities held-to-maturity, at amortized cost (fair value of $3,323 and $3,432 at March 31, 2023 and December 31, 2022, respectively) Securities held-to-maturity, at amortized cost Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss After one but within five years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Net change in time deposits in banks Proceeds from (Payments for) in Interest-Bearing Deposits in 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Trading Symbol Trading Symbol Entity File Number Entity File Number Less: Net deferred loan fees Financing Receivable, Unamortized Loan Cost (Fee) and Purchase Premium (Discount) Schedule of Interest-Bearing Deposits. Schedule of Interest-bearing deposits. [Table Text Block] Schedule of Interest-bearing deposits. 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five million, amount Deposits, $5 Million Or More, Amount Deposits, $5 Million Or More, Amount Subsequent Events [Abstract] Subsequent Events [Abstract] Commercial land and development Real estate , Commercial land and development Real Estate Commercial Land And Development [Member] Real Estate Commercial Land and Development [Member] Deposits over five million, total Deposits, $5 Million Or More, Per Deposit Deposits, $5 Million Or More, Per Deposit Number of investment securities in a continuous loss position for twelve months or more Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions Investment Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Non-interest expense: Noninterest Expense [Abstract] Within one year Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Interest paid Interest Paid, Excluding 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dividends paid Dividends, Common Stock 2023 Time Deposit Maturities, Remainder of Fiscal Year Financing Receivable, Past Due [Line Items] Financing Receivable, Past Due [Line Items] Loans held for investment, net of allowance for credit losses Financing Receivable, after Allowance for Credit Loss Deferred tax asset (Interest receivable and other assets) Deferred Tax Assets, Other Entity Interactive Data Current Entity Interactive Data Current Service charges on deposit accounts Service Charges On Deposit Accounts Service Charges On Deposit Accounts Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Net changes in: Increase (Decrease) in Operating Capital [Abstract] Proceeds from sale of securities available-for-sale Sales proceeds Proceeds from Sale of Debt Securities, Available-for-Sale Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Cash dividends paid Payments of Dividends Retained Earnings Retained Earnings [Member] Deposits Deposits, Fair Value Disclosure Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Common Stock Common Stock [Member] Other comprehensive income (loss) Other comprehensive loss Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Federal Reserve Bank Branch [Domain] Federal Reserve Bank Branch [Domain] Federal Reserve Bank Branch [Domain] Number of reportable segments Number of Reportable Segments Statement [Table] Statement [Table] Shares vested (in USD per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Document Quarterly Report Document Quarterly Report Letter of Credit Letter of Credit [Member] Pledged loans Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged Statistical Measurement [Axis] Statistical Measurement [Axis] Grantee Status [Domain] Grantee Status [Domain] Retained earnings Cumulative effect of adoption of ASC 842 and 326 on retained earnings Retained Earnings (Accumulated Deficit) After ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Equity Components [Axis] Equity Components [Axis] Fair Value, Recurring Fair Value, Recurring [Member] Subordinated notes Subordinated Debt Obligations, Fair Value Disclosure Segments Segment Reporting, Policy [Policy Text Block] Deposits and Federal Funds Purchased Deposits And Federal Funds Purchased [Member] Deposits And Federal Funds Purchased Less than twelve continuous months, fair value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Document Fiscal Year Focus Document Fiscal Year Focus Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Statement [Line Items] Statement [Line Items] Investment in Federal Home Loan Bank Stock Investment in Federal Home Loan Bank Stock [Member] Beginning of the period balance (in shares) End of the period balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Interest receivable and other assets Interest Receivable and Other Assets Variable Rate [Domain] Variable Rate [Domain] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] CALIFORNIA CALIFORNIA Number of branch offices Number Of Branch Offices Number Of Branch Offices Farmland Real estate, farmland Real Estate Farmland [Member] Real Estate Farmland [Member] Gross unrealized losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Operating leases, right-of-use asset, net Operating Lease, Right-of-Use Asset Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Unrecognized compensation expense Employee Benefits and Share-Based Compensation Summary of Credit Quality Indicators Financing Receivable Credit Quality Indicators [Table Text Block] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Document Transition Report Document Transition Report Local Phone Number Local Phone Number 2020 Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year After ten years Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10 Recently Issued Accounting Standards, Accounting Standards Adopted, and Accounting Standards Issued But Not Yet Adopted New Accounting Pronouncements, Policy [Policy Text Block] FHLB stock and other investments Investment in Federal Home Loan Bank Stock, Fair Value Disclosure Money market accounts Interest Expense Domestic Deposit Liabilities, Money Market Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Collateralized mortgage obligations Collateralized mortgage obligations Collateralized Debt Obligations [Member] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Provision for income taxes Income Tax Expense (Benefit) Geographical [Domain] Geographical [Domain] Savings accounts Interest-Bearing Domestic Deposit, Savings Preferred stock (in USD per share) Preferred Stock, Par or Stated Value Per Share Income Statement [Abstract] Income Statement [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus Cumulative Effect, Period of Adoption, Adjusted Balance Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Interest-Bearing Deposits Interest-Bearing Deposits [Text Block] Interest-Bearing Deposits Liabilities: Liabilities, Total [Member] Weighted average diluted common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Derivatives – interest rate swap Derivative Liability Interest rate swap Derivative Liability, Subject to Master Netting Arrangement, before Offset Net gain on sale of securities available-for-sale Net Gain On Sale Of Securities Available-For-Sale This item represents the difference between the realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. Loans, including fees Interest and Fee Income, Loans and Leases Cumulative Effect Adjustment for Adoption of ASC 326 Accounting Standards Update and Change in Accounting Principle [Table Text Block] Consumer and other Consumer And Other [Member] Consumer And Other Cash dividends paid (in USD per share) Common Stock, Dividends, Per Share, Cash Paid ICS I C S [Member] I C S [Member] Common stock, no par value; 100,000,000 shares authorized; 17,258,904 shares issued and outstanding at March 31, 2023; 17,241,926 shares issued and outstanding at December 31, 2022 Common Stock, Value, Issued Carrying Amounts Reported Value Measurement [Member] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Accrued Interest Interest Expense, Policy [Policy Text Block] Shares granted (in USD per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Total commitments and standby letters of credit Other Commitment Allowance for credit losses - loans Allowance for Credit Losses Less: Allowance for credit losses Beginning Balance Ending Balance Allowance for credit loss Financing Receivable, Allowance for Credit Loss Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Federal Reserve Bank Branch [Axis] Federal Reserve Bank Branch [Axis] Federal Reserve Bank Branch Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] FHLB Agreement FHLB Agreement [Member] FHLB Agreement Common stock, shares issued (in shares) Common Stock, Shares, Issued Data processing and software Information Technology and Data Processing Prior Financing Receivable, Originated, More than Five Years before Current Fiscal Year Loans held for sale Loans Held-for-sale, Fair Value Disclosure Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Subordinated debt, net Subordinated Debt Number of securities in unrealized loss positions Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions Interest-bearing Deposits Interest-bearing Deposits Interest-bearing Deposits Amendment Flag Amendment Flag Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Professional services Professional Fees Face amount Debt Instrument, Face Amount Available-for-sale (AFS) and Held-to-maturity Debt Securities Investment, Policy [Policy Text Block] Stock issued under stock award plans, net Stock Issued During Period, Value, Employee Stock Purchase Plan Total comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Gross unrealized gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Entity Current Reporting Status Entity Current Reporting Status Schedule of Realized Gain (Loss) Schedule of Realized Gain (Loss) [Table Text Block] Unpaid principal balance Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance Available-for-Sale Available-for-Sale Securities, Debt Maturities [Abstract] Total interest and fee income Interest and Dividend Income, Operating Stock issued under stock award plans, net (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Purchase of BOLI Payment to Acquire Life Insurance Policy, Investing Activities Investment securities in a loss position for less than twelve months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Liabilities: Liabilities [Abstract] Schedule of Other Commitments Other Commitments [Table Text Block] Basis of Financial Statement Presentation and Consolidation and Emerging Growth Company Basis of Accounting, Policy [Policy Text Block] Premises and equipment, net Property, Plant and Equipment, Net Operating lease liabilities recorded in conjunction with adoption of ASC 842 Lease Obligation Incurred Salaries and employee benefits Labor and Related Expense Federal Funds Purchased Federal Funds Purchased [Member] Title of Individual [Domain] Title of Individual [Domain] Total network deposits Total network deposits Total network deposits Forfeited in period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Common stock, shares authorized (in shares) Common Stock, Shares Authorized Cash and due from financial institutions Cash and Due from Banks Commercial Portfolio Segment Commercial Portfolio Segment [Member] Maximum Maximum [Member] Accumulated other comprehensive loss, net Accumulated Other Comprehensive Income (Loss), Net of Tax Line of credit outstanding Line of Credit Facility, Fair Value of Amount Outstanding Proceeds from sale of loans Proceeds from Sale of Loans Held-for-sale Gain on sale of loans Gain (Loss) on Sale of Loans and Leases Loans greater than 90 days past due Financing Receivable, 90 Days or More Past Due, Still Accruing Stock forfeitures Stock Repurchased and Retired During Period, Value Number of collateral dependent loans in process of foreclosure Number Of Collateral Dependent Loans In Process Of Foreclosure Number Of Collateral Dependent Loans In Process Of Foreclosure Entity Small Business Entity Small Business Amortization, debt issuance costs Accumulated Amortization, Debt Issuance Costs Measurement Basis [Axis] Measurement Basis [Axis] Other Commitments [Table] Other Commitments [Table] Beginning balance (in shares) Ending balance (in shares) Shares, Outstanding Measurement Frequency [Domain] Measurement Frequency [Domain] Shareholders' Equity Stockholders' Equity Note Disclosure [Text Block] Common stock declared (in USD per share) Common Stock, Dividends, Per Share, Declared Revolving Loans Financing Receivable, Revolving Summary of Fair Value of Assets and Liabilities Measured on Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Other time accounts Interest Expense Domestic Deposit Liabilities, Other Time Deposit Purchases of securities available-for-sale Payments to Acquire Debt Securities, Available-for-Sale Taxable securities Interest Income, Securities, Operating, Taxable Subordinated Debt Subordinated Debt [Member] Stock forfeitures (in shares) Stock Repurchased and Retired During Period, Shares Title of 12(b) Security Title of 12(b) Security Financial assets: Financial Assets, Recorded At Amortized Cost [Abstract] Financial Assets, Recorded At Amortized Cost Basis of Presentation and Summary of Significant Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] After one but within five years Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five 2022 Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year Interest-bearing transaction accounts Interest Expense Domestic Deposit Liabilities, Checking Interest rate Subordinated Borrowing, Interest Rate Number of deposits Deposits, $5 Million Or More, Number Of Deposit Relationships Deposits, $5 Million Or More, Number Of Deposit Relationships FHLB advances Proceeds from FHLBank Borrowings, Financing Activities Subsequent Event [Line Items] Subsequent Event [Line Items] Debt Instrument [Line Items] Debt 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