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Interest-Bearing Deposits - Narrative (Details) - USD ($)	Jun. 30, 2024	Dec. 31, 2023
Interest-bearing Deposits
Interest-bearing domestic deposit, time deposits	$ 333,431,000	$ 466,600,000
One-way deposits	$ 0	$ 0

X

- Definition

Interest-bearing Deposits

+ References

No definition available.

+ Details

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Namespace Prefix:	fsbc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

One-Way Deposits

+ References

No definition available.

+ Details

Name:	fsbc_OneWayDeposits
Namespace Prefix:	fsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of interest-bearing domestic time deposits. Time deposits bear interest for a fixed, stated period of time and include certificate of deposits and individual retirement accounts.

+ 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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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant