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Fair Value Measurements - Carrying Amount and Estimated Fair Value (Details) Details 91 false false R92.htm 995536 - Disclosure - Note 13 - Fair Value Measurements - Fair Value on a Recurring Basis (Details) Sheet http://www.bankatfidelity.com/20231231/role/statement-note-13-fair-value-measurements-fair-value-on-a-recurring-basis-details Note 13 - Fair Value Measurements - Fair Value on a Recurring Basis (Details) Details 92 false false R93.htm 995537 - Disclosure - Note 13 - Fair Value Measurements - Fair Value on a Nonrecurring Basis (Details) Sheet http://www.bankatfidelity.com/20231231/role/statement-note-13-fair-value-measurements-fair-value-on-a-nonrecurring-basis-details Note 13 - Fair Value Measurements - Fair Value on a Nonrecurring Basis (Details) Details 93 false false R94.htm 995538 - Disclosure - Note 13 - Fair Value Measurements - Off-balance Sheet Risks (Details) Sheet http://www.bankatfidelity.com/20231231/role/statement-note-13-fair-value-measurements-offbalance-sheet-risks-details Note 13 - Fair Value Measurements - Off-balance Sheet Risks (Details) Details 94 false false R95.htm 995539 - Disclosure - Note 13 - Fair Value Measurements - Summary of Supply Commitment (Details) Sheet http://www.bankatfidelity.com/20231231/role/statement-note-13-fair-value-measurements-summary-of-supply-commitment-details Note 13 - Fair Value Measurements - Summary of Supply Commitment (Details) Details 95 false false R96.htm 995540 - Disclosure - Note 14 - Earnings Per Share (Details Textual) Sheet http://www.bankatfidelity.com/20231231/role/statement-note-14-earnings-per-share-details-textual Note 14 - Earnings Per Share (Details Textual) Details http://www.bankatfidelity.com/20231231/role/statement-note-14-earnings-per-share-tables 96 false false R97.htm 995541 - Disclosure - Note 14 - Earnings Per Share - Computation of Basic and Diluted EPS (Details) Sheet http://www.bankatfidelity.com/20231231/role/statement-note-14-earnings-per-share-computation-of-basic-and-diluted-eps-details Note 14 - Earnings Per Share - Computation of Basic and Diluted EPS (Details) Details 97 false false R98.htm 995542 - Disclosure - Note 15 - Regulatory Matters (Details Textual) Sheet http://www.bankatfidelity.com/20231231/role/statement-note-15-regulatory-matters-details-textual Note 15 - Regulatory Matters (Details Textual) Details http://www.bankatfidelity.com/20231231/role/statement-note-15-regulatory-matters-tables 98 false false R99.htm 995543 - Disclosure - Note 15 - Regulatory Matters - Compliance With Regulatory Capital Requirements Under Banking Regulations (Details) Sheet http://www.bankatfidelity.com/20231231/role/statement-note-15-regulatory-matters-compliance-with-regulatory-capital-requirements-under-banking-regulations-details Note 15 - Regulatory Matters - Compliance With Regulatory Capital Requirements Under Banking Regulations (Details) Details 99 false false R100.htm 995544 - Disclosure - Note 16 - Related Party Transactions (Details Textual) Sheet http://www.bankatfidelity.com/20231231/role/statement-note-16-related-party-transactions-details-textual Note 16 - Related Party Transactions (Details Textual) Details http://www.bankatfidelity.com/20231231/role/statement-note-16-related-party-transactions-tables 100 false false R101.htm 995545 - Disclosure - Note 16 - Related Party Transactions - Schedule of Related Party Transactions (Details) Sheet http://www.bankatfidelity.com/20231231/role/statement-note-16-related-party-transactions-schedule-of-related-party-transactions-details Note 16 - Related Party Transactions - Schedule of Related Party Transactions (Details) Details 101 false false R102.htm 995546 - Disclosure - Note 17 - Contingencies (Details Textual) Sheet http://www.bankatfidelity.com/20231231/role/statement-note-17-contingencies-details-textual Note 17 - Contingencies (Details Textual) Details http://www.bankatfidelity.com/20231231/role/statement-note-17-contingencies 102 false false R103.htm 995547 - Disclosure - Note 18 - Recent Accounting Pronouncements (Details Textual) Sheet http://www.bankatfidelity.com/20231231/role/statement-note-18-recent-accounting-pronouncements-details-textual Note 18 - Recent Accounting Pronouncements (Details Textual) Details http://www.bankatfidelity.com/20231231/role/statement-note-18-recent-accounting-pronouncements 103 false false R104.htm 995548 - Disclosure - Note 19 - Parent Company Only - Condensed Balance Sheets (Details) Sheet http://www.bankatfidelity.com/20231231/role/statement-note-19-parent-company-only-condensed-balance-sheets-details Note 19 - Parent Company Only - Condensed Balance Sheets (Details) Details 104 false false R105.htm 995549 - Disclosure - Note 19 - Parent Company Only - Condensed Income Statements (Details) Sheet http://www.bankatfidelity.com/20231231/role/statement-note-19-parent-company-only-condensed-income-statements-details Note 19 - Parent Company Only - Condensed Income Statements (Details) Details 105 false false R106.htm 995550 - Disclosure - Note 19 - Parent Company Only - Statements of Comprehensive Income (Details) Sheet http://www.bankatfidelity.com/20231231/role/statement-note-19-parent-company-only-statements-of-comprehensive-income-details Note 19 - Parent Company Only - Statements of Comprehensive Income (Details) Details 106 false false R107.htm 995551 - Disclosure - Note 19 - Parent Company Only - Condensed Statements of Cash Flows (Details) Sheet http://www.bankatfidelity.com/20231231/role/statement-note-19-parent-company-only-condensed-statements-of-cash-flows-details Note 19 - Parent Company Only - Condensed Statements of Cash Flows (Details) Details 107 false false R108.htm 995552 - Disclosure - Note 20 - Employee Benefits (Details Textual) Sheet http://www.bankatfidelity.com/20231231/role/statement-note-20-employee-benefits-details-textual Note 20 - Employee Benefits (Details Textual) Details http://www.bankatfidelity.com/20231231/role/statement-note-20-employee-benefits 108 false false R109.htm 995553 - Disclosure - Note 21 - Revenue Recognition (Details Textual) Sheet http://www.bankatfidelity.com/20231231/role/statement-note-21-revenue-recognition-details-textual Note 21 - Revenue Recognition (Details Textual) Details http://www.bankatfidelity.com/20231231/role/statement-note-21-revenue-recognition 109 false false R110.htm 995554 - Disclosure - Note 22 - Leases (Details Textual) Sheet http://www.bankatfidelity.com/20231231/role/statement-note-22-leases-details-textual Note 22 - Leases (Details Textual) Details http://www.bankatfidelity.com/20231231/role/statement-note-22-leases-tables 110 false false R111.htm 995555 - Disclosure - Note 22 - Leases - Analysis of Leased Property Under Finance Leases (Details) Sheet http://www.bankatfidelity.com/20231231/role/statement-note-22-leases-analysis-of-leased-property-under-finance-leases-details Note 22 - Leases - Analysis of Leased Property Under Finance Leases (Details) Details 111 false false R112.htm 995556 - Disclosure - Note 22 - Leases - Schedule of Future Minimum Lease Payments Under Finance Leases (Details) Sheet http://www.bankatfidelity.com/20231231/role/statement-note-22-leases-schedule-of-future-minimum-lease-payments-under-finance-leases-details Note 22 - Leases - Schedule of Future Minimum Lease Payments Under Finance Leases (Details) Details 112 false false R113.htm 995557 - Disclosure - Note 22 - Leases - Lease Cost (Details) Sheet http://www.bankatfidelity.com/20231231/role/statement-note-22-leases-lease-cost-details Note 22 - Leases - Lease Cost (Details) Details 113 false false R114.htm 995558 - Disclosure - Note 22 - Leases - Future Minimum Payments for Operating Leases (Details) Sheet http://www.bankatfidelity.com/20231231/role/statement-note-22-leases-future-minimum-payments-for-operating-leases-details Note 22 - Leases - Future Minimum Payments for Operating Leases (Details) Details 114 false false R115.htm 995559 - Disclosure - Note 22 - Leases - Undiscounted Cash Flows to be Received Under Operating Leases (Details) Sheet http://www.bankatfidelity.com/20231231/role/statement-note-22-leases-undiscounted-cash-flows-to-be-received-under-operating-leases-details Note 22 - Leases - Undiscounted Cash Flows to be Received Under Operating Leases (Details) Details 115 false false R116.htm 995560 - Disclosure - Note 22 - Leases - Lease Income Recognized (Details) Sheet http://www.bankatfidelity.com/20231231/role/statement-note-22-leases-lease-income-recognized-details Note 22 - Leases - Lease Income Recognized (Details) Details 116 false false R117.htm 995561 - Disclosure - Note 24 - Derivative Instruments (Details Textual) Sheet http://www.bankatfidelity.com/20231231/role/statement-note-24-derivative-instruments-details-textual Note 24 - Derivative Instruments (Details Textual) Details http://www.bankatfidelity.com/20231231/role/statement-note-24-derivative-instruments-tables 117 false false R118.htm 995562 - Disclosure - Note 24 - Derivative Instruments - Schedule of Derivative Instruments (Details) Sheet http://www.bankatfidelity.com/20231231/role/statement-note-24-derivative-instruments-schedule-of-derivative-instruments-details Note 24 - Derivative Instruments - Schedule of Derivative Instruments (Details) Details 118 false false All Reports Book All Reports [ix-0514-Hidden-Fact-Eligible-For-Transform] WARN: 39 fact(s) appearing in ix:hidden were eligible for transformation: dei:CurrentFiscalYearEndDate, dei:EntityRegistrantName, ecd:NonRule10b51ArrAdoptedFlag, ecd:NonRule10b51ArrTrmntdFlag, ecd:Rule10b51ArrAdoptedFlag, ecd:Rule10b51ArrTrmntdFlag, fdbc:FederalReserveBankReserveRequirement, fdbc:FinancingReceivablesTroubledDebtRestructuringSubsequentDefaultNumberOfContracts, us-gaap:AdvancesFromFederalHomeLoanBanks, us-gaap:CommonStockNoParValue, us-gaap:CommonStockSharesAuthorized, us-gaap:CommonStockSharesIssued, us-gaap:CommonStockSharesOutstanding, us-gaap:ContractWithCustomerAssetNet, us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLoss, us-gaap:DebtSecuritiesHeldToMaturityAllowanceForCreditLoss, us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet, us-gaap:FinancingReceivableAllowanceForCreditLosses, us-gaap:HeldToMaturitySecuritiesFairValue, us-gaap:LoansHeldForSaleFairValueDisclosure, us-gaap:OtherForeclosedAssets, us-gaap:PreferredStockNoParValue, us-gaap:PreferredStockSharesAuthorized, us-gaap:PreferredStockSharesIssued, us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod, us-gaap:TreasuryStockCommonShares, us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued - fdbc20231231_10k.htm 8, 10, 13, 14, 15, 16, 17, 18, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51 [DQC.US.0090.9374] The element LesseeOperatingLeaseLiabilityPaymentsDue with a value of 12302000.000000 should be equal to the sum of OperatingLeaseLiability plus LesseeOperatingLeaseLiabilityUndiscountedExcessAmount. The value of these adds to 12124000.000000. A difference of 178000.000000. In an annual filing this reconciliation is required and all elements should have a value in the current reporting period. If the difference is due to an extension reconciliation item, then the filer should add a calculation relationship. The calculation tree should show the parent element as LesseeOperatingLeaseLiabilityPaymentsDue with children of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount + OperatingLeaseLiability + any extension items. There should already be a calculation tree defined for the components of LesseeOperatingLeaseLiabilityPaymentsDue comprised of LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths + LesseeOperatingLeaseLiabilityPaymentsDueYearTwo etc. These two beakdowns of LesseeOperatingLeaseLiabilityPaymentsDue should be in seperate calculation groups. If an extension item appears as a child calculation of LesseeOperatingLeaseLiabilityPaymentsDue then no error is produced. The properties of this LesseeOperatingLeaseLiabilityPaymentsDue fact are: Context: i_2022-12-31 Unit: (none). - fdbc20231231_10k.htm 15911, 15913, 15914 - fdbc20231231_10k.htm 15911, 15913, 15914 fdbc-20231231.xsd fdbc-20231231_cal.xml fdbc-20231231_def.xml fdbc-20231231_lab.xml fdbc-20231231_pre.xml fdbc20231231_10k.htm performancegraph2023.jpg http://fasb.org/srt/2023 http://fasb.org/us-gaap/2023 http://xbrl.sec.gov/dei/2023 http://xbrl.sec.gov/ecd/2023 true true