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Note 11 - Employee Benefits (Details Textual) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($)
Employee Stock Ownership Plan (ESOP), Minimum Service Period, Hours | 1,000 |  |  |
Employee Stock Ownership Plan (ESOP), Requisite Service Period (Month) | 12 months |  |  |
Employee Stock Ownership Plan (ESOP), Debt Structure, Amortization Period (Year) | 20 years |  |  |
Employee Stock Ownership Plan (ESOP), Debt Structure, Estimated Interest Rate | 2.46% |  | 2.46% |
Employee Stock Ownership Plan (ESOP), Principal and Interest Payments from ESOP |  |  | $ 837,000 | $ 835,000
Employee Stock Ownership Plan (ESOP), Compensation Expense, Net of Dividends Received | $ 136,000 | $ 167,000 | $ 481,000 | $ 507,000

X
- Definition The amount of plan compensation cost recognized during the period, net of dividends received. + References No definition available. + Details
Name: | fnwb_EmployeeStockOwnershipPlanEsopCompensationExpenseNetOfDividendsReceived
Namespace Prefix: | fnwb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amortization period of the loan made by a third-party lender directly to the ESOP. + References No definition available. + Details
Name: | fnwb_EmployeeStockOwnershipPlanEsopDebtStructureAmortizationPeriod
Namespace Prefix: | fnwb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of estimated interest paid by the ESOP to a lender. + References No definition available. + Details
Name: | fnwb_EmployeeStockOwnershipPlanEsopDebtStructureEstimatedInterestRate
Namespace Prefix: | fnwb_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of minimum service period hours required for the employee stock ownership plan. + References No definition available. + Details
Name: | fnwb_EmployeeStockOwnershipPlanEsopMinimumServicePeriodHours
Namespace Prefix: | fnwb_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of principal and interest paid by the ESOP to a lender. + References No definition available. + Details
Name: | fnwb_EmployeeStockOwnershipPlanEsopPrincipalAndInterestPaymentsFromEsop
Namespace Prefix: | fnwb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The requisite service period pursuant to the employee stock ownership plan (ESOP). + References No definition available. + Details
Name: | fnwb_EmployeeStockOwnershipPlanEsopRequisiteServicePeriod
Namespace Prefix: | fnwb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration