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Note 6 - Leases (Tables)

3 Months Ended

Mar. 31, 2025

Notes Tables

Lease, Cost [Table Text Block]

		Three Months Ended March 31,				Three Months Ended March 31,
Lease cost:		2025				2024
Operating lease cost		$	471			$	474
Short-term lease cost			4				3
Total lease cost		$	475			$	477

Lessee, Operating Lease, Supplemental Cash Flow Information [Table Text Block]

		At or For the Three months Ended March 31,
Cash paid for amounts included in the measurement of lease liabilities:		2025				2024
Operating cash flows from operating leases		$	483			$	490
Weighted average remaining lease term- operating leases (in years)			3.4				3.8
Weighted average discount rate- operating leases			3.17	%			2.97	%

Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block]

Remainder of 2025		$	1,216
2026			1,572
2027			1,273
2028			531
2029			402
Thereafter			676
Total lease payments			5,670
Less imputed interest			(521	)
Total		$	5,149

X

- Definition

Tabular disclosure of supplemental information related to operating leases.

+ References

No definition available.

+ Details

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Namespace Prefix:	fsbw_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-4

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X

- Definition

Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-6

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- References

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration