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common stock (in shares) Common Stock, Convertible, Shares Issuable Common Stock, Convertible, Shares Issuable Other Other Commitments [Member] Other Commitments [Member] Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] 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 Asset Class [Axis] Asset Class [Axis] 2023 Time Deposit Maturities, Remainder of Fiscal Year Financial liabilities: Financial Liabilities, Recorded At Amortized Cost [Abstract] Financial Liabilities, Recorded At Amortized Cost Common stock, shares issued (in shares) Common Stock, Shares, Issued Shares vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Weighted average remaining term on the unvested restricted shares (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Unvested, Weighted Average Remaining Contractual Terms Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Unvested, Weighted Average Remaining Contractual Terms Gross unrealized losses Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss Interest-bearing transaction accounts Interest Expense Domestic Deposit Liabilities, Checking Security Exchange Name Security Exchange Name Accounting Standards Update 2018-01 Accounting Standards Update 2018-01 [Member] Total securities in a loss position, unrealized loss Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss Accounting Standards Update 2019-11 Accounting Standards Update 2019-11 [Member] FHLB stock price (in USD per share) Federal Home Loan Bank, Advances, Stock Price For Sales And Purchases Federal Home Loan Bank, Advances, Stock Price For Sales And Purchases Number of investment securities in a continuous loss 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Schedule of Interest-bearing deposits. [Table Text Block] Schedule of Interest-bearing deposits. 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and NAV [Axis] Fair Value Hierarchy and NAV [Axis] 2027 Time Deposit Maturities, Year Four Retained earnings Cumulative effect of adoption of ASC 842 and 326 on retained earnings Retained Earnings (Accumulated Deficit) Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Face amount Debt Instrument, Face Amount Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Federal Reserve Bank Branch [Domain] Federal Reserve Bank Branch [Domain] Federal Reserve Bank Branch [Domain] Other Commitments [Line Items] Other Commitments [Line Items] Advertising and promotional Advertising Expense Total non-interest income Noninterest Income Entity Address, State or Province Entity Address, State or Province Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Interest payable and other liabilities Increase (Decrease) in Interest Payable, Net Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Maturities, prepayments, and calls of securities available-for-sale Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Non-interest income: Noninterest Income [Abstract] CALIFORNIA CALIFORNIA Beginning balance (in shares) Ending balance (in shares) Shares, Outstanding Asset Class [Domain] Asset Class [Domain] Interest rate swap Derivative Asset, Subject to Master Netting Arrangement, before Offset Common Stock (in USD per share) Common Stock, Par or Stated Value Per Share Interest income related to non-accrual loans Financing Receivable, Nonaccrual, Interest Income Deposits and Federal Funds Purchased Deposits And Federal Funds Purchased [Member] Deposits And Federal Funds Purchased Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Derivatives – interest rate swap Interest Rate Swap [Member] Professional services Professional Fees Debt Instrument [Axis] Debt Instrument [Axis] Number of securities in unrealized loss positions Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions Stock forfeitures Stock Repurchased and Retired During Period, Value Operating lease liability Operating Lease, Liability Number of branch offices Number Of Branch Offices Number Of Branch Offices Total liabilities Liabilities 2020 Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year Farmland Real estate, farmland Real Estate Farmland [Member] Real Estate Farmland [Member] Basis of Presentation and Summary of Significant Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Cumulative Effect, Period of Adoption, Adjusted Balance Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Purchase of FHLB stock Payments for (Proceeds from) Federal Home Loan Bank Stock Loans held for sale Financing Receivable, Held-for-Sale, Not Part of Disposal Group, after Valuation Allowance Measurement Frequency [Domain] Measurement Frequency [Domain] Title of Individual [Axis] Title of Individual [Axis] Unrealized (losses) on securities: Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, before Tax, Portion Attributable to Parent [Abstract] Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] Total non-interest expense Noninterest Expense Time deposits in banks Time Deposits Debt Disclosure [Abstract] Debt Disclosure [Abstract] Number of reportable segments Number of Reportable Segments Earnings per common share: Earnings Per Share [Abstract] Subsequent Event [Line Items] Subsequent Event [Line Items] Common stock, no par value; 100,000,000 shares authorized; 17,257,357 shares issued and outstanding at September 30, 2023; 17,241,926 shares 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[Abstract] Segments Segment Reporting, Policy [Policy Text Block] Cumulative Effect Adjustment for Adoption of ASC 326 Accounting Standards Update and Change in Accounting Principle [Table Text Block] Interest payable and other liabilities Interest Payable Mortgage-backed securities Mortgage-backed securities Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] Pledging Purpose [Axis] Pledging Purpose [Axis] Interest-Bearing Deposits Interest-Bearing Deposits [Text Block] Interest-Bearing Deposits Supplemental disclosure of cash flow information: Supplemental Cash Flow Information [Abstract] Summary of Credit Quality Indicators Financing Receivable Credit Quality Indicators [Table Text Block] Accounting Standards Update [Axis] Accounting Standards Update [Axis] Entity Filer Category Entity Filer Category Allowance for credit losses - loans Allowance for Credit Losses Beginning Balance Ending Balance Allowance for credit loss Financing Receivable, Allowance for Credit Loss Statement [Table] Statement [Table] Current Fiscal Year End Date Current Fiscal Year End Date EPS Earnings Per Share, Policy [Policy Text Block] 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. Securities held-to-maturity Fair Value Debt Securities, Held-to-Maturity, Fair Value Pass Pass [Member] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Gain on sale of loans Gain (Loss) on Sale of Loans and Leases Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized ICS I C S [Member] I C S [Member] 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 Loans and Allowance for Credit Losses Financing Receivables [Text Block] Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Marketable Securities [Line Items] Marketable Securities [Line Items] Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Accrued Interest Revenue Recognition, Interest [Policy Text Block] Revolving Converted to Term Financing Receivable, Revolving, Converted to Term Loan Federal Reserve Bank Branch [Axis] Federal Reserve Bank Branch [Axis] Federal Reserve Bank Branch Prior Financing Receivable, Originated, More than Five Years before Current Fiscal Year Federal Funds Purchased Federal Funds Purchased [Member] FHLB Agreement FHLB Agreement [Member] FHLB Agreement Securities held-to-maturity, at amortized cost, net of allowance for credit losses of $20 at September 30, 2023 and $0 at December 31, 2022 (fair value of $2,811 and $3,432 at September 30, 2023 and December 31, 2022, respectively) Amortized Cost Securities held-to-maturity, at amortized cost Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Total shareholders’ equity Beginning balance Ending balance Equity, Attributable to Parent Gross realized gains Debt Securities, Available-for-Sale, Realized Gain Loans held for investment, net of allowance for credit losses Financing Receivable, after Allowance for Credit Loss Restricted Stock Restricted Stock [Member] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Within one year Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Interest-bearing Deposits Interest-bearing Deposits Interest-bearing Deposits Subsequent Events [Abstract] Subsequent Events [Abstract] Income before provision for income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Schedule of Other Commitments Other Commitments [Table Text Block] Financing Receivable, Past Due [Line Items] Financing Receivable, Past Due [Line Items] Obligations of states and political subdivisions US States and Political Subdivisions Debt Securities [Member] Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Significant Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Entity Emerging Growth Company Entity Emerging Growth Company Debt issuance costs Debt Issuance Costs, Net Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] After ten years Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10 Employee Share-Based Payment Arrangement, Employee [Member] Loans held for sale Loan, Held-for-Sale, Fair Value Disclosure Document Fiscal Period Focus Document Fiscal Period Focus Remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Stock compensation expense Share-Based Payment Arrangement, Noncash Expense Net interest income after provision for credit losses Interest Income (Expense), after Provision for Loan Loss Common Stock Common Stock [Member] City Area Code City Area Code Entity Address, Postal Zip Code Entity Address, Postal Zip Code Product and Service [Axis] Product and Service [Axis] Financial Asset, Aging [Domain] Financial Asset, Aging [Domain] Time deposits in banks Time Deposits, at Carrying Value Fair Value Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract] Other operating expenses Other Noninterest Expense Document Fiscal Year Focus Document Fiscal Year Focus Geographical [Domain] Geographical [Domain] Marketable Securities [Table] Marketable Securities [Table] Total deposits Deposits Total network deposits Total network deposits Total network deposits Interest-bearing Total interest-bearing deposits Interest-Bearing Deposit Liabilities Minimum Minimum [Member] Other Noninterest Income, Other Operating Income Premises and equipment, net Property, Plant and Equipment, Net Receivables [Abstract] Receivables [Abstract] Cash dividends paid (in USD per share) Common Stock, Dividends, Per Share, Cash Paid Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] ASSETS Assets [Abstract] After ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Available-for-Sale Available-for-Sale Securities, Debt Maturities [Abstract] Decrease in operating lease liability Increase (Decrease) in Operating Lease Liability 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 Liabilities: Liabilities [Abstract] Deferred Tax Asset (Interest receivable and other assets) Deferred Tax Assets, Other Income taxes paid Income Taxes Paid, Net Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Net change in time deposits in banks Proceeds from 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Credit Loss, Maturity, Allocated and Single Maturity Date [Abstract] Equity Component [Domain] Equity Component [Domain] Bank-owned life insurance Bank Owned Life Insurance Basic weighted average common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Debt Instrument [Line Items] Debt Instrument [Line Items] Entity Current Reporting Status Entity Current Reporting Status Reclassifications Reclassification, Comparability Adjustment [Policy Text Block] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Subordinated debt, net Subordinated Debt 2026 Time Deposit Maturities, Year Three Residential construction Real estate, Residential construction Real Estate Residential Construction Loans [Member] Real Estate Residential Construction Loans [Member] Statement [Line Items] Statement [Line Items] Fair Value Estimate of Fair Value Measurement [Member] Line of credit Long-Term Line of Credit Summary of Debt Securities Available-for-sale Debt Securities, Available-for-Sale [Table Text Block] Real estate related loans (in percent) Real Estate Related Loans Percentage Real Estate Related Loans Percentage Subordinated notes Subordinated Debt Obligations, Fair Value Disclosure Accounting Standards Update 2016-02 [Member] Accounting Standards Update 2016-13 [Member]