XML 146 R116.htm IDEA: XBRL DOCUMENT
v3.6.0.2

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Narrative (Details) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 07, 2017 USD ($) | Dec. 31, 2016 USD ($) contract | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) contract | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  | $ 2,199,862,000 |  |  |  | $ 1,366,667,000 |  |  |  | $ 2,199,862,000 | $ 1,366,667,000 |
Cash pledged as collateral to derivative counterparties |  | 900,000 |  |  |  | 16,100,000 |  |  |  | 900,000 | 16,100,000 |
Amortized cost of securities pledged as collateral to derivative counterparties |  | 47,800,000 |  |  |  | 24,600,000 |  |  |  | 47,800,000 | 24,600,000 |
Fair value of securities as pledged collateral to derivative counterparties |  | 47,900,000 |  |  |  | 24,600,000 |  |  |  | 47,900,000 | 24,600,000 |
Interest expense |  | 13,276,000 | $ 12,540,000 | $ 11,577,000 | $ 10,779,000 | 9,676,000 | $ 8,481,000 | $ 7,766,000 | $ 7,258,000 | 48,172,000 | 33,181,000 | $ 28,351,000
Estimated liability |  | 2,804,000 |  |  |  | 10,676,000 |  |  |  | 2,804,000 | 10,676,000 |
Reclassification out of Accumulated Other Comprehensive Income | Subsequent Event | Accumulated Net Gain (Loss) from Cash Flow Hedges |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest expense | $ 6,600,000 |  |  |  |  |  |  |  |  |  |  |
Interest Rate Swap |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash pledged as collateral to derivative counterparties |  | 650,000 |  |  |  | 9,720,000 |  |  |  | 650,000 | 9,720,000 |
Amount of collateral posted for the net liability positions |  | 19,800,000 |  |  |  | 28,200,000 |  |  |  | 19,800,000 | 28,200,000 |
Interest Rate Swap | Commercial counterparties |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash pledged as collateral to derivative counterparties |  | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Derivative asset, fair value, amount offset against collateral |  | 11,500,000 |  |  |  | 17,100,000 |  |  |  | 11,500,000 | 17,100,000 |
Amount of collateral posted for the net liability positions |  | 4,400,000 |  |  |  | 0 |  |  |  | 4,400,000 | 0 |
Interest Rate Swap | Financial institutions counterparties |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amount of collateral posted for the net liability positions |  | 15,400,000 |  |  |  | 28,200,000 |  |  |  | 15,400,000 | 28,200,000 |
Non-hedging derivatives |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  | 208,145,000 |  |  |  | 36,043,000 |  |  |  | 208,145,000 | 36,043,000 |
Estimated liability |  | $ (4,738,000) |  |  |  | (323,000) |  |  |  | $ (4,738,000) | (323,000) |
Cash Flow Hedging | Interest Rate Swap |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of derivative contracts (contract) | contract |  | 6 |  |  |  |  |  |  |  | 6 |  |
Durations of derivative instruments |  |  |  |  |  |  |  |  |  | 3 years |  |
Cash Flow Hedging | Interest Rate Swap | FHLBB borrowings |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  | $ 300,000,000 |  |  |  |  |  |  |  | $ 300,000,000 |  |
Period of rolling advances |  |  |  |  |  |  |  |  |  | 1 month |  |
Maturity period with fixed interest rate |  |  |  |  |  |  |  |  |  | 1 month |  |
Interest expense |  |  |  |  |  |  |  |  |  | $ 3,981,000 | 0 |
Cash Flow Hedging | Hedging derivatives |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  | 300,000,000 |  |  |  | 300,000,000 |  |  |  | 300,000,000 | 300,000,000 |
Estimated liability |  | 6,573,000 |  |  |  | 8,532,000 |  |  |  | 6,573,000 | 8,532,000 |
Cash Flow Hedging | Hedging derivatives | Interest Rate Swap |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  | 300,000,000 |  |  |  |  |  |  |  | 300,000,000 |  |
Cash Flow Hedging | Hedging derivatives | Interest Rate Swap | FHLBB borrowings |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  | 300,000,000 |  |  |  |  |  |  |  | 300,000,000 |  |
Estimated liability |  | 6,573,000 |  |  |  |  |  |  |  | 6,573,000 |  |
Economic Hedging |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Credit valuation adjustments |  | $ 800,000 |  |  |  |  |  |  |  | $ 800,000 |  |
Economic Hedging | Tax advantaged economic development bonds |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fixed rate of interest (percent) |  | 5.09% |  |  |  |  |  |  |  | 5.09% |  |
Maturity period |  |  |  |  |  |  |  |  |  | 21 years |  |
Economic Hedging | Interest Rate Swap | Tax advantaged economic development bonds |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  | $ 11,400,000 |  |  |  |  |  |  |  | $ 11,400,000 |  |
Economic Hedging | Hedging derivatives |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  | 1,691,717,000 |  |  |  | 1,030,624,000 |  |  |  | 1,691,717,000 | 1,030,624,000 |
Estimated liability |  | 969,000 |  |  |  | 2,467,000 |  |  |  | 969,000 | 2,467,000 |
Economic Hedging | Hedging derivatives | Interest Rate Swap |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  | 1,300,000,000 |  |  |  |  |  |  |  | 1,300,000,000 |  |
Economic Hedging | Hedging derivatives | Interest Rate Swap | Tax advantaged economic development bonds |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  | 11,386,000 |  |  |  | 11,984,000 |  |  |  | 11,386,000 | 11,984,000 |
Estimated liability |  | 2,021,000 |  |  |  | 2,450,000 |  |  |  | 2,021,000 | 2,450,000 |
Economic Hedging | Hedging derivatives | Risk Participation Agreements |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  | 83,360,000 |  |  |  | 59,016,000 |  |  |  | 83,360,000 | 59,016,000 |
Estimated liability |  | (5,000) |  |  |  | 56,000 |  |  |  | (5,000) | 56,000 |
Economic Hedging | Hedging derivatives | Forward Commitments |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  | 259,889,000 |  |  |  | 44,840,000 |  |  |  | 259,889,000 | 44,840,000 |
Estimated liability |  | $ (722,000) |  |  |  | $ (53,000) |  |  |  | $ (722,000) | $ (53,000) |

X
- Definition Represents the period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, bearing fixed interest rate. + References No definition available. + Details
Name: | bhlb_DebtInstrumentFixedInterestTerm
Namespace Prefix: | bhlb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of credit risk valuation adjustments to the net of derivative assets (derivative liabilities) to properly reflect the credit quality of the counterparties. + References No definition available. + Details
Name: | bhlb_DerivativeCreditRiskValuationAdjustmentDerivativeAssetsLiabilitiesNet
Namespace Prefix: | bhlb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the period of series of rolling advances. + References No definition available. + Details
Name: | bhlb_DerivativePeriodOfRollingAdvances
Namespace Prefix: | bhlb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the amortized cost of securities that are pledged as collateral to the derivative counterparties. + References No definition available. + Details
Name: | bhlb_DerivativeSecuritiesPledgedAsCollateralAmortizedCost
Namespace Prefix: | bhlb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
Name: | invest_DerivativeNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624258-113959 + Details
Name: | us-gaap_CollateralAlreadyPostedAggregateFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
Name: | us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226016-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=d3e41678-113959 + Details
Name: | us-gaap_DerivativeCollateralRightToReclaimCash
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value, after effects of master netting arrangements, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset offset against an obligation to return collateral. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=64837297&loc=d3e41678-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226016-175313 + Details
Name: | us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
Name: | us-gaap_DerivativeFixedInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of derivative instruments of a particular group held by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5579245-113959 + Details
Name: | us-gaap_DerivativeNumberOfInstrumentsHeld
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DerivativeTermOfContract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The fair value as of the balance sheet date of financial instruments and other positions owned by the entity and pledged to counterparties as collateral, including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=64858031&loc=SL6224234-111729 + Details
Name: | us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
Name: | us-gaap_InterestExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis=us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedNetGainLossFromCashFlowHedgesIncludingPortionAttributableToNoncontrollingInterestMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CounterpartyNameAxis=bhlb_CommercialCounterpartiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CounterpartyNameAxis=bhlb_FinancialInstitutionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_CashFlowHedgingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByLiabilityClassAxis=us-gaap_FederalHomeLoanBankBorrowingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_DesignatedAsHedgingInstrumentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=bhlb_EconomicHedgingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByLiabilityClassAxis=us-gaap_NontaxableMunicipalBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=bhlb_RiskParticipationAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=bhlb_ForwardCommitmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |