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Financial Instruments with Off-Balance Sheet Risk (Details) - Commitments to extend credit - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Financial Instruments with Off-Balance Sheet Risk
Financial instruments with off-balance sheet risk	$ 23,000,000	$ 24,000,000
Financial instruments with off-balance sheet risk at variable rates	$ 7,160,000	$ 9,368,000

X

- Definition

The fair value of financial liabilities at variable rates, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

+ References

No definition available.

+ Details

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Namespace Prefix:	fdsb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-10

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
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