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FAIR VALUE MEASUREMENTS (Details 3) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Changes in Level 3 assets that were measured at fair value on a recurring basis      
Paydown of trading security $ 2,447us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments $ 1,635us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments $ 1,937us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments
Trust preferred securities      
Changes in Level 3 assets and liabilities that were measured at fair value on a recurring basis      
Number of securities in the portfolio 1bhlb_InvestmentPortfolioNumberOfSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember
   
Privately owned equity security      
Changes in Level 3 assets and liabilities that were measured at fair value on a recurring basis      
Number of securities in the portfolio 1bhlb_InvestmentPortfolioNumberOfSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_PrivateEquityFundsMember
   
Forward Commitments.      
Changes in Level 3 assets that were measured at fair value on a recurring basis      
Unrealized (loss) gain, net recognized in other non-interest income   1,074us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
 
Unrealized gains (losses) relating to instruments still held at the end of the period (93)bhlb_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsRelatedToAssetsStillHeld
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
19bhlb_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsRelatedToAssetsStillHeld
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
 
Liabilities      
Balance at the beginning of the period 19us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
(1,055)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
 
Unrealized (loss) gain recognized in other non-interest income (112)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
   
Balance at the end of the period (93)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
19us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
 
Trading Security      
Changes in Level 3 assets and liabilities that were measured at fair value on a recurring basis      
Number of securities in the portfolio 1bhlb_InvestmentPortfolioNumberOfSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_TradingAccountAssetsMember
   
Changes in Level 3 assets that were measured at fair value on a recurring basis      
Balance at the beginning of the period 14,840us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_TradingAccountAssetsMember
16,893us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_TradingAccountAssetsMember
 
Unrealized (loss) gain, net recognized in other non-interest income 610us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_TradingAccountAssetsMember
(1,539)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_TradingAccountAssetsMember
 
Paydown of trading security (541)us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_TradingAccountAssetsMember
(514)us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_TradingAccountAssetsMember
 
Balance at the end of the period 14,909us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_TradingAccountAssetsMember
14,840us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_TradingAccountAssetsMember
 
Unrealized gains (losses) relating to instruments still held at the end of the period 2,355bhlb_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsRelatedToAssetsStillHeld
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_TradingAccountAssetsMember
1,745bhlb_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsRelatedToAssetsStillHeld
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_TradingAccountAssetsMember
 
Securities Available for Sale      
Changes in Level 3 assets that were measured at fair value on a recurring basis      
Balance at the beginning of the period 1,964us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AvailableforsaleSecuritiesMember
885us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AvailableforsaleSecuritiesMember
 
Purchase of Marketable Equity Security   770us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AvailableforsaleSecuritiesMember
 
Unrealized gain included in accumulated other comprehensive loss 362us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AvailableforsaleSecuritiesMember
309us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AvailableforsaleSecuritiesMember
 
Balance at the end of the period 2,326us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AvailableforsaleSecuritiesMember
1,964us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AvailableforsaleSecuritiesMember
 
Unrealized gains (losses) relating to instruments still held at the end of the period (999)bhlb_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsRelatedToAssetsStillHeld
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AvailableforsaleSecuritiesMember
(1,410)bhlb_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsRelatedToAssetsStillHeld
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AvailableforsaleSecuritiesMember
 
Interest rate lock commitments      
Changes in Level 3 assets that were measured at fair value on a recurring basis      
Balance at the beginning of the period 258us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_InterestRateLockCommitmentsMember
6,258us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_InterestRateLockCommitmentsMember
 
Unrealized (loss) gain, net recognized in other non-interest income 3,804us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_InterestRateLockCommitmentsMember
8,722us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_InterestRateLockCommitmentsMember
 
Transfers to held for sale loans (3,437)us-gaap_TransferOfPortfolioLoansAndLeasesToHeldForSale1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_InterestRateLockCommitmentsMember
(14,722)us-gaap_TransferOfPortfolioLoansAndLeasesToHeldForSale1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_InterestRateLockCommitmentsMember
 
Balance at the end of the period 625us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_InterestRateLockCommitmentsMember
258us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_InterestRateLockCommitmentsMember
 
Unrealized gains (losses) relating to instruments still held at the end of the period $ 625bhlb_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsRelatedToAssetsStillHeld
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_InterestRateLockCommitmentsMember
$ 258bhlb_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsRelatedToAssetsStillHeld
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_InterestRateLockCommitmentsMember