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EMPLOYEE BENEFITS (Details 5) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Stock options outstanding by range of exercise prices        
Number of options (in shares) 39,870us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions      
Summary of activity related to the stock options        
Cash received from options exercised $ 7,000us-gaap_ProceedsFromStockOptionsExercised $ 4,000us-gaap_ProceedsFromStockOptionsExercised    
Parent Company        
Summary of activity related to the stock options        
Cash received from options exercised 7,000us-gaap_ProceedsFromStockOptionsExercised
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4,000us-gaap_ProceedsFromStockOptionsExercised
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Exercise Price Range, one        
Stock options outstanding by range of exercise prices        
Number of options (in shares) 34,739us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
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Exercise Price (in dollars per share) $ 25.25us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
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Exercise Price Range, two        
Stock options outstanding by range of exercise prices        
Number of options (in shares) 3,000us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
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Exercise Price (in dollars per share) $ 26.55us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
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Exercise Price Range, three        
Stock options outstanding by range of exercise prices        
Number of options (in shares) 2,131us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
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Exercise Price (in dollars per share) $ 30.60us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
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Exercise Price Range, four        
Stock options outstanding by range of exercise prices        
Number of options (in shares) 0us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
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Exercise Price (in dollars per share) $ 0.00us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
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Restricted stock        
Summary of activity related to the stock options        
Compensation expense for restricted stock 1,087,000us-gaap_RestrictedStockExpense
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1,152,000us-gaap_RestrictedStockExpense
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1,185,000us-gaap_RestrictedStockExpense
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Shares        
Unvested at the beginning of the period (in shares) 197,599us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
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Granted (in shares) 80,273us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
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  21,993us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
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Vested (in shares) 27,030us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
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Forfeited (in shares) 2,398us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
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Unvested at the end of the period (in shares) 248,444us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
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197,599us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
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Weighted Average Grant-Date Fair Value        
Unvested at the beginning of the period (in dollars per share) $ 21.18us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
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Granted (in dollars per share) $ 25.32us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
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Vested (in dollars per share) $ 21.44us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
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Forfeited (in dollars per share) $ 22.33us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
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Unvested at the end of the period (in dollars per share) $ 22.48us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
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$ 21.18us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
Numbers of shares expected to vest   72,940bdge_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpectedVestingShares
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Total fair value of shares vested 579,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
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1,065,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
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1,140,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
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Total unrecognized compensation costs   3,648,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
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Weighted-average period over which cost expected to be recognized   4 years 4 months 24 days    
Stock options        
Summary of activity related to the stock options        
Intrinsic value of options exercised 3,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
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4,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
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Cash received from options exercised 7,000us-gaap_ProceedsFromStockOptionsExercised
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4,000us-gaap_ProceedsFromStockOptionsExercised
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Compensation expense $ 0us-gaap_AllocatedShareBasedCompensationExpense
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$ 0us-gaap_AllocatedShareBasedCompensationExpense
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$ 0us-gaap_AllocatedShareBasedCompensationExpense
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Five year specified vesting schedule | Restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
Numbers of shares expected to vest 20,598bdge_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpectedVestingShares
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12,652bdge_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpectedVestingShares
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Vesting period (in years) 5 years 5 years    
Percentage of award vesting one third after year three, one third after year four, and one third vesting after year five 33.00%bdge_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPercentageFiveYearSpecified
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Year in vesting schedule in which one-third of the awards vest, period one 3bdge_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingPeriodOne
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3bdge_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingPeriodOne
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3bdge_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingPeriodOne
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Year in vesting schedule in which one-third of the awards vest, period two 4bdge_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingPeriodTwo
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4bdge_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingPeriodTwo
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4bdge_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingPeriodTwo
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Year in vesting schedule in which one-third of the awards vest, period three 5bdge_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingPeriodThree
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5bdge_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingPeriodThree
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5bdge_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingPeriodThree
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Seven year specified vesting schedule | Restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
Numbers of shares expected to vest 53,425bdge_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpectedVestingShares
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51,175bdge_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpectedVestingShares
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Vesting period (in years)   7 years   7 years
Percentage of award vesting one third after year five, one third after year six, and one third vesting after year seven 33.00%bdge_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPercentageSevenYearSpecified
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Year in vesting schedule in which one-third of the awards vest, period one 5bdge_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingPeriodOne
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5bdge_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingPeriodOne
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Year in vesting schedule in which one-third of the awards vest, period two 6bdge_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingPeriodTwo
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6bdge_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingPeriodTwo
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Year in vesting schedule in which one-third of the awards vest, period three 7bdge_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingPeriodThree
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7bdge_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingPeriodThree
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Five year ratable vesting | Restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
Numbers of shares expected to vest   9,113bdge_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpectedVestingShares
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Vesting period (in years)   5 years    
Two year ratable vesting | Restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
Numbers of shares expected to vest 6,250bdge_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpectedVestingShares
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Vesting period (in years) 5 years