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SECURITIES (Details 4) (Bridgehampton National Bank)
 12 Months Ended 24 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
item
Minimum
      
Investment Securities      
Percentage of assets backed by a U.S. Government guarantee where the Bank had invested holdings that exceeded 10% of consolidated stockholder's equity 95.00%bdge_PercentageOfAssetsBackedByAUSGovernmentGuaranteeWhereBankHadInvestedHoldingsThatExceededTenPercentOfStockholdersEquity
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Stockholder's equity | Investment holding concentration risk | Other than U.S. Government and its Sponsored Entities      
Investment Securities      
Number of issuers where the Bank had invested holdings that exceeded 10% of consolidated stockholder's equity     1bdge_NumberOfIssuersWithBankInvestmentHoldingsExceedingTenPercentOfStockholdersEquity
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_StockholdersEquityTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bdge_InvestmentHoldingsOtherThanUSGovernmentSponsoredEnterprisesDebtSecuritiesMember
Threshold for disclosure     10.00%bdge_ThresholdForDisclosurePercentage
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_StockholdersEquityTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bdge_InvestmentHoldingsOtherThanUSGovernmentSponsoredEnterprisesDebtSecuritiesMember
Investment holding percentage 13.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_StockholdersEquityTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bdge_InvestmentHoldingsOtherThanUSGovernmentSponsoredEnterprisesDebtSecuritiesMember		 14.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_StockholdersEquityTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ dei_LegalEntityAxis
= bdge_BridgehamptonNationalBankMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bdge_InvestmentHoldingsOtherThanUSGovernmentSponsoredEnterprisesDebtSecuritiesMember