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Loans Receivable and Allowance for Credit Losses - Related Party Loans (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Loans and Leases Receivable, Related Parties [Roll Forward] |  |
Balance, Beginning of the Period | $ 511 | $ 546
Repayments, Net | (16) | (17)
Balance, End of Period | $ 495 | $ 529

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- Definition Amount of repayments of related loans. + References No definition available. + Details
Name: | fdsb_LoansAndLeasesReceivableRelatedPartiesRepayments
Namespace Prefix: | fdsb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts due from related parties at the balance sheet date. + 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(7)(e)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483326/850-10-50-1 + Details
Name: | us-gaap_LoansAndLeasesReceivableRelatedParties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_LoansAndLeasesReceivableRelatedPartiesRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration