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Post-modification balance of TDRs Listed by type of Modification(Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Loans, Allowance for Loan Losses and Credit Quality [Abstract]      
Extended maturity $ 3,441indb_FinancingReceivableModificationsPostModificationRecordedInvestmentExtendedMaturity $ 3,582indb_FinancingReceivableModificationsPostModificationRecordedInvestmentExtendedMaturity $ 5,867indb_FinancingReceivableModificationsPostModificationRecordedInvestmentExtendedMaturity
Adjusted interest rate 727indb_FinancingReceivableModificationsPostModificationRecordedInvestmentAdjustedInterestRate 0indb_FinancingReceivableModificationsPostModificationRecordedInvestmentAdjustedInterestRate 2,182indb_FinancingReceivableModificationsPostModificationRecordedInvestmentAdjustedInterestRate
Combination rate & maturity 2,640indb_FinancingReceivableModificationsPostModificationRecordedInvestmentCombinationOfRateAndMaturity 8,917indb_FinancingReceivableModificationsPostModificationRecordedInvestmentCombinationOfRateAndMaturity 5,007indb_FinancingReceivableModificationsPostModificationRecordedInvestmentCombinationOfRateAndMaturity
Court ordered concession 837indb_FinancingReceivableModificationsPostModificationRecordedInvestmentCourtOrderedConcession 690indb_FinancingReceivableModificationsPostModificationRecordedInvestmentCourtOrderedConcession 3,084indb_FinancingReceivableModificationsPostModificationRecordedInvestmentCourtOrderedConcession
Total $ 7,645indb_FinancingReceivableModificationsPostModificationRecordedInvestments $ 13,189indb_FinancingReceivableModificationsPostModificationRecordedInvestments $ 16,140indb_FinancingReceivableModificationsPostModificationRecordedInvestments