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Regulatory Matters (Schedule Of Compliance With Regulatory Capital Requirements Under Banking Regulations) (Details) (USD $)
In Thousands, unless otherwise specified
Jul. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Tier 1 capital (to risk-weighted assets), For capital adequacy purposes, Ratio 4.50%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets    
Parent Company [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Total capital (to risk-weighted assets), Actual, Amount   $ 75,756us-gaap_Capital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
$ 70,669us-gaap_Capital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Total capital (to risk-weighted assets), For Capital adequacy purposes, Amount   39,730us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
37,255us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Total capital (to risk-weighted assets), Actual, Ratio   15.30%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
15.20%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Total capital (to risk-weighted assets), For capital adequacy purposes, Ratio   8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Tier 1 capital (to risk-weighted assets), Actual, Amount   69,376us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
64,706us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Tier 1 capital (to risk-weighted assets), For capital adequacy purposes, Amount   19,865us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
18,628us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Tier 1 capital (to risk-weighted assets), Actual, Ratio   14.00%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
13.90%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Tier 1 capital (to risk-weighted assets), For capital adequacy purposes, Ratio   4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Tier 1 capital (to average assets), Actual, Amount   69,376us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
64,706us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Tier 1 capital (to average assets), For capital adequacy purposes, Amount   27,679us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
25,089us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Tier 1 capital (to average assets), Actual, Ratio   10.00%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
10.30%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Tier 1 capital (to average assets), For capital adequacy purposes, Ratio   4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Bank [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Total capital (to risk-weighted assets), Actual, Amount   75,230us-gaap_Capital
/ dei_LegalEntityAxis
= fdbc_BankMember
70,373us-gaap_Capital
/ dei_LegalEntityAxis
= fdbc_BankMember
Total capital (to risk-weighted assets), For Capital adequacy purposes, Amount   39,728us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= fdbc_BankMember
37,251us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= fdbc_BankMember
Total capital (to risk-weighted assets), To be well capitalized under prompt corrective action provisions, Amount   49,660us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= fdbc_BankMember
46,563us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= fdbc_BankMember
Total capital (to risk-weighted assets), Actual, Ratio   15.20%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= fdbc_BankMember
15.10%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= fdbc_BankMember
Total capital (to risk-weighted assets), For capital adequacy purposes, Ratio   8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= fdbc_BankMember
8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= fdbc_BankMember
Total capital (to risk-weighted assets), To be well capitalized under prompt corrective action provisions, Ratio   10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= fdbc_BankMember
10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= fdbc_BankMember
Tier 1 capital (to risk-weighted assets), Actual, Amount   68,985us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= fdbc_BankMember
64,512us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= fdbc_BankMember
Tier 1 capital (to risk-weighted assets), For capital adequacy purposes, Amount   19,864us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= fdbc_BankMember
18,625us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= fdbc_BankMember
Tier 1 capital (to risk-weighted assets), To be well capitalized under prompt corrective action provisions, Amount   29,796us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= fdbc_BankMember
27,938us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= fdbc_BankMember
Tier 1 capital (to risk-weighted assets), Actual, Ratio   13.90%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= fdbc_BankMember
13.90%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= fdbc_BankMember
Tier 1 capital (to risk-weighted assets), For capital adequacy purposes, Ratio   4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= fdbc_BankMember
4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= fdbc_BankMember
Tier 1 capital (to risk-weighted assets), To be well capitalized under prompt corrective action provisions, Ratio   6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= fdbc_BankMember
6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= fdbc_BankMember
Tier 1 capital (to average assets), Actual, Amount   68,985us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= fdbc_BankMember
64,512us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= fdbc_BankMember
Tier 1 capital (to average assets), For capital adequacy purposes, Amount   27,658us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= fdbc_BankMember
25,073us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= fdbc_BankMember
Tier 1 capital (to average assets), To be well capitalized under prompt corrective action provisions, Amount   $ 34,573us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= fdbc_BankMember
$ 31,341us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= fdbc_BankMember
Tier 1 capital (to average assets), Actual, Ratio   10.00%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= fdbc_BankMember
10.30%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= fdbc_BankMember
Tier 1 capital (to average assets), For capital adequacy purposes, Ratio   4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= fdbc_BankMember
4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= fdbc_BankMember
Tier 1 capital (to average assets), To be well capitalized under prompt corrective action provisions, Ratio   5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= fdbc_BankMember
5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= fdbc_BankMember