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FAIR VALUE MEASUREMENTS (Details 3) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Changes in Level 3 assets that were measured at fair value on a recurring basis      
Paydown of trading security $ (317)us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments $ 604us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments  
Forward Commitments.      
Changes in Level 3 assets that were measured at fair value on a recurring basis      
Unrealized gains (losses) relating to instruments still held at the end of the period (93)bhlb_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsRelatedToAssetsStillHeld
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
(96)bhlb_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsRelatedToAssetsStillHeld
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
 
Liabilities      
Balance at the beginning of the period   (19)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
93us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Unrealized (loss) gain recognized in other non-interest income   (115)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
 
Balance at the end of the period 93us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
96us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
93us-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 14,909us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_TradingAccountAssetsMember
14,840us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_TradingAccountAssetsMember
 
Unrealized (loss) gain, net recognized in other non-interest income 203us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_TradingAccountAssetsMember
218us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_TradingAccountAssetsMember
 
Paydown of trading security (142)us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_TradingAccountAssetsMember
(135)us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_TradingAccountAssetsMember
 
Balance at the end of the period 14,970us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_TradingAccountAssetsMember
14,923us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_TradingAccountAssetsMember
 
Unrealized gains (losses) relating to instruments still held at the end of the period 2,558bhlb_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsRelatedToAssetsStillHeld
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_TradingAccountAssetsMember
1,962bhlb_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 2,326us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AvailableforsaleSecuritiesMember
1,964us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AvailableforsaleSecuritiesMember
 
Sale AFS Security (1,327)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AvailableforsaleSecuritiesMember
   
Unrealized gain included in accumulated other comprehensive loss (280)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AvailableforsaleSecuritiesMember
82us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AvailableforsaleSecuritiesMember
 
Balance at the end of the period 719us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AvailableforsaleSecuritiesMember
2,046us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AvailableforsaleSecuritiesMember
 
Unrealized gains (losses) relating to instruments still held at the end of the period (51)bhlb_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsRelatedToAssetsStillHeld
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AvailableforsaleSecuritiesMember
(1,288)bhlb_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsRelatedToAssetsStillHeld
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AvailableforsaleSecuritiesMember
 
Securities Available for Sale | 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_FairValueByAssetClassAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_PrivateEquityFundsMember
   
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 625us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_InterestRateLockCommitmentsMember
258us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_InterestRateLockCommitmentsMember
 
Unrealized (loss) gain, net recognized in other non-interest income 1,730us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_InterestRateLockCommitmentsMember
719us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_InterestRateLockCommitmentsMember
 
Transfers to held for sale loans (1,378)us-gaap_TransferOfPortfolioLoansAndLeasesToHeldForSale1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_InterestRateLockCommitmentsMember
(600)us-gaap_TransferOfPortfolioLoansAndLeasesToHeldForSale1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_InterestRateLockCommitmentsMember
 
Balance at the end of the period 977us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_InterestRateLockCommitmentsMember
377us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_InterestRateLockCommitmentsMember
 
Unrealized gains (losses) relating to instruments still held at the end of the period $ 977bhlb_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsRelatedToAssetsStillHeld
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_InterestRateLockCommitmentsMember
$ 377bhlb_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsRelatedToAssetsStillHeld
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_InterestRateLockCommitmentsMember