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Investment Securities - Other narratives (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Investment Securities
Debt securities, available-for-sale	$ 18,685,000	$ 0
Realized loss	$ 1,144,000

X

- Definition

The amount of available for sale securities sold during the period.

+ References

No definition available.

+ Details

Name:	fdsb_DebtSecuritiesAvailableForSaleSecuritiesSold
Namespace Prefix:	fdsb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-9

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleRealizedLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration