0001628280-25-038796 | 10-Q | XBRL Viewer

Interest Bearing Deposits - Interest-Bearing Deposits (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2025	Dec. 31, 2024
Interest-bearing Deposits [Abstract]
Time accounts, $250 or more	$ 377,441	$ 344,129
Time deposits minimum	$ 250

Interest Bearing Deposits - Interest Expense Recognized on Interest-Bearing Deposits (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Interest-bearing Deposits [Abstract]
Time accounts, $250 or more	$ 3,945	$ 2,412	$ 7,701	$ 6,235
Time deposits minimum			$ 250

Label	Element	Value
Loan-related Fees	fsbc_LoanRelatedFees	$ 468,000
Loan-related Fees	fsbc_LoanRelatedFees	370,000
Loan-related Fees	fsbc_LoanRelatedFees	916,000
Loan-related Fees	fsbc_LoanRelatedFees	799,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	fsbc_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerFairValue	1,918,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	fsbc_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerFairValue	48,126,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	fsbc_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerFairValue	34,738,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	fsbc_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerFairValue	256,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	fsbc_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerFairValue	1,926,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	fsbc_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerFairValue	86,964,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	fsbc_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerFairValue	4,082,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	fsbc_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerFairValue	49,476,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	fsbc_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerFairValue	35,630,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	fsbc_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerFairValue	279,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	fsbc_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerFairValue	1,863,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	fsbc_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerFairValue	91,330,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value	fsbc_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValue	2,853,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value	fsbc_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValue	48,126,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value	fsbc_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValue	35,085,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value	fsbc_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValue	256,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value	fsbc_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValue	1,926,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value	fsbc_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValue	88,246,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value	fsbc_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValue	6,398,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value	fsbc_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValue	49,476,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value	fsbc_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValue	35,630,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value	fsbc_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValue	279,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value	fsbc_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValue	1,863,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value	fsbc_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValue	$ 93,646,000
Number Of Unsecured Federal Funds	fsbc_NumberOfUnsecuredFederalFunds	5
Number Of Unsecured Federal Funds	fsbc_NumberOfUnsecuredFederalFunds	5
Time Deposit at Fair Value Disclosure	fsbc_TimeDepositAtFairValueDisclosure	$ 849,000
Time Deposit at Fair Value Disclosure	fsbc_TimeDepositAtFairValueDisclosure	849,000
Time Deposit at Fair Value Disclosure	fsbc_TimeDepositAtFairValueDisclosure	4,121,000
Time Deposit at Fair Value Disclosure	fsbc_TimeDepositAtFairValueDisclosure	4,121,000
Transfer From Loans Held For Sale To Loans Held For Investment	fsbc_TransferFromLoansHeldForSaleToLoansHeldForInvestment	1,035,000
Transfer From Loans Held For Sale To Loans Held For Investment	fsbc_TransferFromLoansHeldForSaleToLoansHeldForInvestment	11,464,000
Time Deposits, Fair Value Disclosure	fsbc_TimeDepositsFairValueDisclosure	772,085,000
Time Deposits, Fair Value Disclosure	fsbc_TimeDepositsFairValueDisclosure	770,872,000
Time Deposits, Fair Value Disclosure	fsbc_TimeDepositsFairValueDisclosure	670,154,000
Time Deposits, Fair Value Disclosure	fsbc_TimeDepositsFairValueDisclosure	669,078,000
Financing Receivable, Nonaccrual, Interest Income, Foregone	fsbc_FinancingReceivableNonaccrualInterestIncomeForegone	35,600
Financing Receivable, Nonaccrual, Interest Income, Foregone	fsbc_FinancingReceivableNonaccrualInterestIncomeForegone	70,900
Financing Receivable, Nonaccrual, Interest Income, Foregone	fsbc_FinancingReceivableNonaccrualInterestIncomeForegone	38,200
Financing Receivable, Nonaccrual, Interest Income, Foregone	fsbc_FinancingReceivableNonaccrualInterestIncomeForegone	77,400
Service Charges On Deposit Accounts	fsbc_ServiceChargesOnDepositAccounts	196,000
Service Charges On Deposit Accounts	fsbc_ServiceChargesOnDepositAccounts	189,000
Service Charges On Deposit Accounts	fsbc_ServiceChargesOnDepositAccounts	411,000
Service Charges On Deposit Accounts	fsbc_ServiceChargesOnDepositAccounts	377,000
Federal Home Loan Bank Stock Dividends	fsbc_FederalHomeLoanBankStockDividends	325,000
Federal Home Loan Bank Stock Dividends	fsbc_FederalHomeLoanBankStockDividends	329,000
Federal Home Loan Bank Stock Dividends	fsbc_FederalHomeLoanBankStockDividends	656,000
Federal Home Loan Bank Stock Dividends	fsbc_FederalHomeLoanBankStockDividends	$ 661,000
Number Of Correspondent Banks	fsbc_NumberOfCorrespondentBanks	5
Number Of Correspondent Banks	fsbc_NumberOfCorrespondentBanks	5
Loan-related Expenses	fsbc_LoanRelatedExpenses	$ 423,000
Loan-related Expenses	fsbc_LoanRelatedExpenses	297,000
Loan-related Expenses	fsbc_LoanRelatedExpenses	742,000
Loan-related Expenses	fsbc_LoanRelatedExpenses	594,000
Financing Receivable, Collateral Dependent, Outstanding	fsbc_FinancingReceivableCollateralDependentOutstanding	1,700,000
Financing Receivable, Collateral Dependent, Outstanding	fsbc_FinancingReceivableCollateralDependentOutstanding	1,800,000
Payments For Origination Of Loans, Net Of Proceeds From Repayments	fsbc_PaymentsForOriginationOfLoansNetOfProceedsFromRepayments	226,659,000
Payments For Origination Of Loans, Net Of Proceeds From Repayments	fsbc_PaymentsForOriginationOfLoansNetOfProceedsFromRepayments	$ 174,992,000
Deposits, $5 Million Or More, Number Of Deposit Relationships	fsbc_Deposits5MillionOrMoreNumberOfDepositRelationships	105
Deposits, $5 Million Or More, Per Deposit	fsbc_Deposits5MillionOrMorePerDeposit	$ 5,000,000
Deposits, $5 Million Or More, Amount	fsbc_Deposits5MillionOrMoreAmount	$ 2,300,000,000
Number Of Collateral Dependent Loans	fsbc_NumberOfCollateralDependentLoans	1
Number Of Collateral Dependent Loans	fsbc_NumberOfCollateralDependentLoans	1
Low Income Housing Credits, Net Change In Commitment	fsbc_LowIncomeHousingCreditsNetChangeInCommitment	$ 10,000,000
Low Income Housing Credits, Net Change In Commitment	fsbc_LowIncomeHousingCreditsNetChangeInCommitment	0
Largest Single Deposit	fsbc_LargestSingleDeposit	366,400,000
Payments For Capital Call For Equity Investment	fsbc_PaymentsForCapitalCallForEquityInvestment	1,285,000
Payments For Capital Call For Equity Investment	fsbc_PaymentsForCapitalCallForEquityInvestment	$ 1,269,000
Unvested Restricted Shares	fsbc_UnvestedRestrictedShares	129,448
Number Of Collateral Dependent Loans In Process Of Foreclosure	fsbc_NumberOfCollateralDependentLoansInProcessOfForeclosure	1
Number Of Collateral Dependent Loans In Process Of Foreclosure	fsbc_NumberOfCollateralDependentLoansInProcessOfForeclosure	0
Noncash Transaction To Acquire Operating Lease Right Of Use Asset	fsbc_NoncashTransactionToAcquireOperatingLeaseRightOfUseAsset	$ 1,433,000
Noncash Transaction To Acquire Operating Lease Right Of Use Asset	fsbc_NoncashTransactionToAcquireOperatingLeaseRightOfUseAsset	1,958,000
Equity Method Investment, Remaining Commitment Amount	fsbc_EquityMethodInvestmentRemainingCommitmentAmount	14,500,000
Equity Method Investment, Remaining Commitment Amount	fsbc_EquityMethodInvestmentRemainingCommitmentAmount	$ 10,800,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Unvested, Weighted Average Remaining Contractual Terms	fsbc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsUnvestedWeightedAverageRemainingContractualTerms	2 years 11 months 26 days
Common Stock, Convertible, Shares Issuable	fsbc_CommonStockConvertibleSharesIssuable	1
Proceeds From (Payments for) Low Income Housing Credits	fsbc_ProceedsFromPaymentsForLowIncomeHousingCredits	$ 5,381,000
Proceeds From (Payments for) Low Income Housing Credits	fsbc_ProceedsFromPaymentsForLowIncomeHousingCredits	$ 1,160,000
Number Of Branch Offices	fsbc_NumberOfBranchOffices	8
Cash And Cash Equivalents, Less Time Deposits, At Carrying Value	fsbc_CashAndCashEquivalentsLessTimeDepositsAtCarryingValue	$ 483,810,000
Cash And Cash Equivalents, Less Time Deposits, At Carrying Value	fsbc_CashAndCashEquivalentsLessTimeDepositsAtCarryingValue	$ 352,343,000
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, More Than 12 Months, Number Of Positions	fsbc_DebtSecuritiesHeldToMaturityContinuousUnrealizedLossPositionMoreThan12MonthsNumberOfPositions	1
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, More Than 12 Months, Number Of Positions	fsbc_DebtSecuritiesHeldToMaturityContinuousUnrealizedLossPositionMoreThan12MonthsNumberOfPositions	1
Federal Reserve Bank Of San Francisco [Member]
Federal Reserve Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	fsbc_FederalReserveBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged	$ 1,300,000,000
Federal Reserve Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	fsbc_FederalReserveBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged	$ 1,200,000,000

Interest Bearing Deposits - Composition of Network Deposits (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Interest Bearing Deposits [Line Items]
Total network deposits	$ 788,490	$ 693,745

Interest-Bearing Deposits - Narrative (Details) - USD ($)	Jun. 30, 2025	Dec. 31, 2024
Interest-bearing Deposits [Abstract]
One-way deposits	$ 0	$ 0

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Details Interest Bearing Deposits - Interest-Bearing Deposits (Details) Interest-Bearing Deposits - Narrative (Details) Interest Bearing Deposits - Composition of Network Deposits (Details) Interest Bearing Deposits - Interest Expense Recognized on Interest-Bearing Deposits (Details) Uncategorized Uncategorized Items - fsbc-20250630_htm.xml All Reports