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Note 9 - Deposits (Details Textual) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Deposit Liabilities, Checking [Member]
Interest-Bearing Domestic Deposit, Brokered	$ 0	$ 70,200,000
Deposit Liabilities, Money Market [Member]
Interest-Bearing Domestic Deposit, Brokered	8,000,000	1,000
Deposit Liabilities, Certificates of Deposits [Member]
Interest-Bearing Domestic Deposit, Brokered	$ 331,300,000	$ 361,300,000

X

- Definition

Amount of interest-bearing domestic third-party deposits placed by or through the assistance of a deposit broker, also known as brokered deposit liabilities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(12))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=fsbw_DepositLiabilitiesCertificatesOfDepositsMember
Namespace Prefix:
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Balance Type:
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