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Note 6 - Leases (Tables)

9 Months Ended

Sep. 30, 2025

Notes Tables

Lease, Cost [Table Text Block]

		Three Months Ended September 30,
Lease cost:		2025				2024
Operating lease cost		$	494			$	464
Short-term lease cost			7				2
Total lease cost		$	501			$	466

		Nine Months Ended September 30,
Lease cost:		2025				2024
Operating lease cost		$	1,459			$	1,414
Short-term lease cost			21				10
Total lease cost		$	1,480			$	1,424

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

		At or For the Three months Ended September 30,
Cash paid for amounts included in the measurement of lease liabilities:		2025				2024
Operating cash flows from operating leases		$	508			$	483
Weighted average remaining lease term- operating leases (in years)			4.7				3.5
Weighted average discount rate- operating leases			3.83	%			3.01	%

		At or For the Nine months Ended September 30,
Cash paid for amounts included in the measurement of lease liabilities:		2025				2024
Operating cash flows from operating leases		$	1,496			$	1,462
Weighted average remaining lease term- operating leases (in years)			4.7				3.5
Weighted average discount rate- operating leases			3.83	%			3.01	%

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

Remainder of 2025		$	491
2026			1,941
2027			1,683
2028			1,066
2029			947
Thereafter			1,931
Total lease payments			8,059
Less imputed interest			(1,066	)
Total		$	6,993

X

- Definition

Tabular disclosure of supplemental information related to operating leases.

+ References

No definition available.

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Namespace Prefix:	fsbw_
Data Type:	dtr-types:textBlockItemType
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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