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Loans Receivable and Allowance for Credit Losses - Collateral-Dependent Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Loans Receivable and Allowance for Credit Losses
Collateral dependent loans	$ 212	$ 153
Residential Real Estate
Loans Receivable and Allowance for Credit Losses
Collateral dependent loans	212	153
One-to-Four Family Mortgages
Loans Receivable and Allowance for Credit Losses
Collateral dependent loans	212	153
One-to-Four Family Mortgages | Residential Real Estate
Loans Receivable and Allowance for Credit Losses
Collateral dependent loans	$ 212	$ 153

X

- Definition

Amount of amortized cost basis of collateral dependent financing receivables.

+ References

No definition available.

+ Details

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Namespace Prefix:	fdsb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 40
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481628/310-20-40-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

+ Details

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Balance Type:	na
Period Type:	duration

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- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Balance Type:
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