CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$ 33,744	$ 41,143	$ 33,188
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	14,968us-gaap_ProvisionForLoanAndLeaseLosses	11,378us-gaap_ProvisionForLoanAndLeaseLosses	9,590us-gaap_ProvisionForLoanAndLeaseLosses
Net amortization of securities	2,447	1,635	1,937
Unamortized net loan costs and premiums	(2,237)	(8,350)	(1,377)
Premises and equipment depreciation and amortization expense	8,292us-gaap_DepreciationAndAmortization	7,120us-gaap_DepreciationAndAmortization	6,045us-gaap_DepreciationAndAmortization
Stock-based compensation expense	3,839us-gaap_ShareBasedCompensation	2,960us-gaap_ShareBasedCompensation	2,260us-gaap_ShareBasedCompensation
Accretion of purchase accounting entries, net	(6,938)us-gaap_AdjustmentForAmortization	(20,313)us-gaap_AdjustmentForAmortization	(9,281)us-gaap_AdjustmentForAmortization
Amortization of other intangibles	4,812	5,268	5,339
Write down of other real estate owned	196us-gaap_ImpairmentOfRealEstate	135us-gaap_ImpairmentOfRealEstate	45us-gaap_ImpairmentOfRealEstate
Excess tax loss from stock-based payment arrangements	(102)	(1,451)	(1,126)
Income from cash surrender value of bank-owned life insurance policies	(3,058)us-gaap_BankOwnedLifeInsuranceIncome	(3,518)us-gaap_BankOwnedLifeInsuranceIncome	(2,716)us-gaap_BankOwnedLifeInsuranceIncome
Gain on sales of securities, net	(482)	(4,758)	(1,655)
Net (increase) decrease in loans held for sale	(3,653)	69,528	(35,451)
Loss on disposition of assets	662us-gaap_GainLossOnDispositionOfAssets	4,232us-gaap_GainLossOnDispositionOfAssets	2,124us-gaap_GainLossOnDispositionOfAssets
Loss (gain) on sale of real estate	231	(2)	128
Loss on termination of hedges	3,237bhlb_GainLossOnTerminationOfHedges
Net change in other	(135)us-gaap_OtherNoncashIncomeExpense	22,404us-gaap_OtherNoncashIncomeExpense	19,604us-gaap_OtherNoncashIncomeExpense
Net cash provided by operating activities	55,823	127,411	28,654
Cash flows from investing activities:
Net decrease in trading security	541	512	486
Proceeds from sales of securities available for sale	143,488	19,386	85,711
Proceeds from maturities, calls and prepayments of securities available for sale	131,202	113,749	102,590
Purchases of securities available for sale	(575,504)	(443,906)	(124,183)
Proceeds from maturities, calls and prepayments of securities held to maturity	4,800	8,991	30,282
Purchases of securities held to maturity	(3,227)	(2,888)	(21,965)
Net change in loans	(481,846)	(181,039)	(160,204)
Acquisitions, net of cash paid	423,416		(111,328)
Net cash used for divestiture			(48,890)bhlb_NetCashUsedForDivestiture
Proceeds from surrender of bank-owned life insurance		186	766
Purchase of bank-owned life insurance		(10,000)
Proceeds from sale of Federal Home Loan Bank stock	5,340	2,434	6,781
Purchase of Federal Home Loan Bank stock	(10,778)	(12,932)
Proceeds of premises and equipment	2,315		260
Purchase of premises and equipment, net	(8,451)	(13,103)	(18,890)
Net investment in limited partnership tax credits	(5,384)		(565)
Proceeds from sale of other real estate	4,784	3,416	3,626
Net cash used in investing activities	(369,304)	(515,194)	(255,523)
Cash flows from financing activities:
Net increase (decrease) in deposits	340,856us-gaap_IncreaseDecreaseInDeposits	(225,070)us-gaap_IncreaseDecreaseInDeposits	167,002us-gaap_IncreaseDecreaseInDeposits
Proceeds from Federal Home Loan Bank advances and other borrowings	5,432,069	1,488,182	485,625
Repayments of Federal Home Loan Bank advances and other borrowings	(5,443,853)us-gaap_RepaymentsOfLongTermDebt	(872,163)us-gaap_RepaymentsOfLongTermDebt	(465,970)us-gaap_RepaymentsOfLongTermDebt
Issuance of long term debt, net			74,138
Purchase of treasury stock			3,044
Net proceeds from reissuance of treasury stock	(2,467)us-gaap_ProceedsFromSaleOfTreasuryStock	(12,249)us-gaap_ProceedsFromSaleOfTreasuryStock
Exercise of stock options	1,064	3,045
Excess tax loss from stock-based payment arrangements	102	1,451	1,126
Common stock cash dividends paid	(18,075)us-gaap_PaymentsOfDividendsCommonStock	(18,118)us-gaap_PaymentsOfDividendsCommonStock	(15,634)us-gaap_PaymentsOfDividendsCommonStock
Net cash provided by financing activities	309,696	365,078	249,331
Net change in cash and cash equivalents	(3,785)	(22,705)	22,462
Cash and cash equivalents at beginning of year	75,539	98,244	75,782
Cash and cash equivalents at end of year	71,754	75,539	98,244
Supplemental cash flow information:
Interest paid on deposits	18,439bhlb_InterestPaidOnDeposits	20,967bhlb_InterestPaidOnDeposits	22,921bhlb_InterestPaidOnDeposits
Interest paid on borrowed funds	9,988us-gaap_InterestPaid	14,056us-gaap_InterestPaid	9,376us-gaap_InterestPaid
Income taxes (refunded) paid, net	746us-gaap_IncomeTaxesPaidNet	(3,729)us-gaap_IncomeTaxesPaidNet	8,869us-gaap_IncomeTaxesPaidNet
Acquisition of non-cash assets and liabilities:
Assets acquired	18,064		1,185,957
Liabilities assumed	(441,550)	(1,672)	(969,598)
Acquisition's stock owned by the Company			5,193
Other non-cash changes:
Other net comprehensive income (loss)	15,636	(6,078)	1,906
Real estate owned acquired in settlement of loans	$ 4,500	$ 4,378	$ 2,243

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Other income (expense) included in net income that results in no cash inflows or outflows in the period. Includes noncash adjustments to reconcile net income (loss) to cash provided by (used in) operating activities that are not separately disclosed.

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The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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The cash inflow from other long-term borrowings not otherwise defined in the taxonomy (with maturities initially due beyond one year or the normal operating cycle of the entity, if longer).

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The cash inflow for proceeds from life insurance policies for which the entity is the beneficiary.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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Amount of cash inflow from sale of Federal Reserve Bank (FRB) stock.

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The cash inflow associated with the sale of other real estate not otherwise defined in the taxonomy.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Amount of expense related to estimated loss from loan and lease transactions.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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