XML 89 R74.htm IDEA: XBRL DOCUMENT
v3.25.1

Note 4 - Loans Receivable and Allowance for Credit Losses on Loans - Schedule of Collateral Dependent Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Financing Receivable, Gross | $ 2,533,821 | $ 2,433,015
Commercial Real Estate [Member] |  |
Financing Receivable, Gross | 7,750 | 5,787
Residential Real Estate [Member] |  |
Financing Receivable, Gross | 425 | 269
Other Nonreal Estate [Member] |  |
Financing Receivable, Gross | 5,412 | 4,888
Collateral Dependent Loans [Member] |  |
Financing Receivable, Gross | 13,587 | 10,944
Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Gross | 1,613,708 | 1,530,381
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Gross | 7,750 | 5,787
Real Estate Portfolio Segment [Member] | Residential Real Estate [Member] |  |
Financing Receivable, Gross | 425 | 269
Real Estate Portfolio Segment [Member] | Other Nonreal Estate [Member] |  |
Financing Receivable, Gross | 0 | 0
Real Estate Portfolio Segment [Member] | Collateral Dependent Loans [Member] |  |
Financing Receivable, Gross | 8,175 | 6,056
Real Estate Portfolio Segment [Member] | Commercial Loan [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Gross | 2,771 | 1,088
Real Estate Portfolio Segment [Member] | Commercial Loan [Member] | Residential Real Estate [Member] |  |
Financing Receivable, Gross | 0 | 0
Real Estate Portfolio Segment [Member] | Commercial Loan [Member] | Other Nonreal Estate [Member] |  |
Financing Receivable, Gross | 0 | 0
Real Estate Portfolio Segment [Member] | Commercial Loan [Member] | Collateral Dependent Loans [Member] |  |
Financing Receivable, Gross | 2,771 | 1,088
Real Estate Portfolio Segment [Member] | Construction Loans [Member] |  |
Financing Receivable, Gross | 330,700 | 303,054
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Gross | 4,979 | 4,699
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Residential Real Estate [Member] |  |
Financing Receivable, Gross | 0 | 0
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Other Nonreal Estate [Member] |  |
Financing Receivable, Gross | 0 |
Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Collateral Dependent Loans [Member] |  |
Financing Receivable, Gross | 4,979 | 4,699
Real Estate Portfolio Segment [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Gross | 75,147 | 69,488
Real Estate Portfolio Segment [Member] | Home Equity Loan [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Gross | 0 | 0
Real Estate Portfolio Segment [Member] | Home Equity Loan [Member] | Residential Real Estate [Member] |  |
Financing Receivable, Gross | 261 | 173
Real Estate Portfolio Segment [Member] | Home Equity Loan [Member] | Other Nonreal Estate [Member] |  |
Financing Receivable, Gross | 0 | 0
Real Estate Portfolio Segment [Member] | Home Equity Loan [Member] | Collateral Dependent Loans [Member] |  |
Financing Receivable, Gross | 261 | 173
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] |  |
Financing Receivable, Gross | 617,322 | 567,742
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Gross | 0 | 0
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] | Residential Real Estate [Member] |  |
Financing Receivable, Gross | 164 | 96
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] | Other Nonreal Estate [Member] |  |
Financing Receivable, Gross | 0 | 0
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] | Collateral Dependent Loans [Member] |  |
Financing Receivable, Gross | 164 | 96
Consumer Portfolio Segment [Member] |  |
Financing Receivable, Gross | 620,181 | 646,753
Consumer Portfolio Segment [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Gross | 0 | 0
Consumer Portfolio Segment [Member] | Residential Real Estate [Member] |  |
Financing Receivable, Gross | 0 | 0
Consumer Portfolio Segment [Member] | Other Nonreal Estate [Member] |  |
Financing Receivable, Gross | 1,966 | 2,205
Consumer Portfolio Segment [Member] | Collateral Dependent Loans [Member] |  |
Financing Receivable, Gross | 1,966 | 2,205
Consumer Portfolio Segment [Member] | Indirect Home Improvement Loan [Member] |  |
Financing Receivable, Gross | 541,946 | 569,903
Consumer Portfolio Segment [Member] | Indirect Home Improvement Loan [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Gross | 0 | 0
Consumer Portfolio Segment [Member] | Indirect Home Improvement Loan [Member] | Residential Real Estate [Member] |  |
Financing Receivable, Gross | 0 | 0
Consumer Portfolio Segment [Member] | Indirect Home Improvement Loan [Member] | Other Nonreal Estate [Member] |  |
Financing Receivable, Gross | 1,677 | 1,863
Consumer Portfolio Segment [Member] | Indirect Home Improvement Loan [Member] | Collateral Dependent Loans [Member] |  |
Financing Receivable, Gross | 1,677 | 1,863
Consumer Portfolio Segment [Member] | Marine Loans [Member] |  |
Financing Receivable, Gross | 74,931 | 73,310
Consumer Portfolio Segment [Member] | Marine Loans [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Gross | 0 | 0
Consumer Portfolio Segment [Member] | Marine Loans [Member] | Residential Real Estate [Member] |  |
Financing Receivable, Gross | 0 | 0
Consumer Portfolio Segment [Member] | Marine Loans [Member] | Other Nonreal Estate [Member] |  |
Financing Receivable, Gross | 289 | 342
Consumer Portfolio Segment [Member] | Marine Loans [Member] | Collateral Dependent Loans [Member] |  |
Financing Receivable, Gross | 289 | 342
Commercial Business Portfolio Segment [Member] |  |
Financing Receivable, Gross | 299,932 | 255,881
Commercial Business Portfolio Segment [Member] | Commercial And Industrial [Member] |  |
Financing Receivable, Gross | 287,014 | 238,301
Commercial Business Portfolio Segment [Member] | Commercial And Industrial [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Gross | 0 | 0
Commercial Business Portfolio Segment [Member] | Commercial And Industrial [Member] | Residential Real Estate [Member] |  |
Financing Receivable, Gross | 0 | 0
Commercial Business Portfolio Segment [Member] | Commercial And Industrial [Member] | Other Nonreal Estate [Member] |  |
Financing Receivable, Gross | 3,446 | 2,683
Commercial Business Portfolio Segment [Member] | Commercial And Industrial [Member] | Collateral Dependent Loans [Member] |  |
Financing Receivable, Gross | $ 3,446 | $ 2,683

X
- Definition Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-5 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Details
Name: | us-gaap_CollateralAxis=us-gaap_ResidentialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=fsbw_OtherNonrealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=fsbw_CollateralDependentLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConstructionLoansMember
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_OnetofourFamilyLoanMember
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_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fsbw_IndirectHomeImprovementLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fsbw_MarineLoansMember
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: |