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ESTIMATED FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 2) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Assets measured at fair value on non-recurring basis      
Other real estate owned $ 0us-gaap_OtherRealEstateAndForeclosedAssets   $ 0us-gaap_OtherRealEstateAndForeclosedAssets
Impaired loans      
Outstanding balance of impaired loans with an allowance recorded 1,045,000us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment   732,000us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
Valuation allowance on impaired loans 428,000us-gaap_ImpairedFinancingReceivableRelatedAllowance   174,000us-gaap_ImpairedFinancingReceivableRelatedAllowance
Additional provision for loan losses 800,000us-gaap_ProvisionForLoanAndLeaseLosses 700,000us-gaap_ProvisionForLoanAndLeaseLosses 2,200,000us-gaap_ProvisionForLoanAndLeaseLosses
Non-recurring basis      
Impaired loans      
Outstanding balance of impaired loans with an allowance recorded 1,000,000us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
  700,000us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Valuation allowance on impaired loans 400,000us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
  200,000us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Additional provision for loan losses 200,000us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
  200,000us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Non-recurring basis | Significant Unobservable Inputs (Level 3)      
Assets measured at fair value on non-recurring basis      
Impaired loans 617,000bdge_ImpairedLoanFinancingReceivableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
  558,000bdge_ImpairedLoanFinancingReceivableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Non-recurring basis | Carrying Amount      
Assets measured at fair value on non-recurring basis      
Impaired loans $ 617,000bdge_ImpairedLoanFinancingReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
  $ 558,000bdge_ImpairedLoanFinancingReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember