XML 85 R74.htm IDEA: XBRL DOCUMENT
v3.25.3

Note 8 - Commitments and Contingencies - Schedule of Commitments (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Aggregate portfolio principal balance | $ 1,640,000 |
Commitments to Extend Credit [Member] |  |
Aggregate portfolio principal balance | 652,261 | $ 558,471
Commercial Real Estate Portfolio Segment [Member] | Commitments to Extend Credit [Member] |  |
Aggregate portfolio principal balance | 229,814 | 142,014
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Commitments to Extend Credit [Member] |  |
Aggregate portfolio principal balance | 2,255 | 1,132
Commercial Real Estate Portfolio Segment [Member] | Commercial and Speculative Construction and Development [Member] | Commitments to Extend Credit [Member] |  |
Aggregate portfolio principal balance | 220,663 | 135,006
Commercial Real Estate Portfolio Segment [Member] | Multifamily [Member] | Commitments to Extend Credit [Member] |  |
Aggregate portfolio principal balance | 6,896 | 5,876
Residential Portfolio Segment [Member] | Commitments to Extend Credit [Member] |  |
Aggregate portfolio principal balance | 195,143 | 159,621
Residential Portfolio Segment [Member] | One-to-four Family Loan [Member] | Commitments to Extend Credit [Member] |  |
Aggregate portfolio principal balance | 54,927 | 23,138
Residential Portfolio Segment [Member] | Home Equity Loan [Member] | Commitments to Extend Credit [Member] |  |
Aggregate portfolio principal balance | 100,769 | 97,358
Residential Portfolio Segment [Member] | Residential Custom Construction [Member] | Commitments to Extend Credit [Member] |  |
Aggregate portfolio principal balance | 39,447 | 39,125
Consumer Portfolio Segment [Member] | Commitments to Extend Credit [Member] |  |
Aggregate portfolio principal balance | 30,125 | 28,566
Commercial Business Portfolio Segment [Member] | Commitments to Extend Credit [Member] |  |
Aggregate portfolio principal balance | 197,179 | 228,270
Commercial Business Portfolio Segment [Member] | Commercial And Industrial [Member] | Commitments to Extend Credit [Member] |  |
Aggregate portfolio principal balance | 141,186 | 174,292
Commercial Business Portfolio Segment [Member] | Warehouse Lending Loan [Member] | Commitments to Extend Credit [Member] |  |
Aggregate portfolio principal balance | $ 55,993 | $ 53,978

X
- Definition The face amount of financial assets, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 825 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478898/942-825-50-1 + Details
Name: | us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommitmentsToExtendCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fsbw_CommercialAndSpeculativeConstructionAndDevelopmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=srt_MultifamilyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fsbw_OnetofourFamilyLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_HomeEquityLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fsbw_ResidentialCustomConstructionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=fsbw_CommercialBusinessPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fsbw_CommercialAndIndustrialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fsbw_WarehouseLendingLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |