CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income (loss)	$ 8,759	$ (1,106)
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	3,851us-gaap_ProvisionForLoanAndLeaseLosses	3,396us-gaap_ProvisionForLoanAndLeaseLosses
Net amortization of securities	(317)	604
Change in unamortized net loan costs and premiums	398	64
Premises and equipment depreciation and amortization expense	2,096us-gaap_DepreciationAndAmortization	1,944us-gaap_DepreciationAndAmortization
Stock-based compensation expense	993us-gaap_ShareBasedCompensation	932us-gaap_ShareBasedCompensation
Accretion of purchase accounting entries, net	(367)us-gaap_AdjustmentForAmortization	(1,999)us-gaap_AdjustmentForAmortization
Amortization of other intangibles	901us-gaap_AmortizationOfIntangibleAssets	1,306us-gaap_AmortizationOfIntangibleAssets
Write down of other real estate owned		125us-gaap_ImpairmentOfRealEstate
Excess tax loss from stock-based payment arrangements	23	(89)
Income from cash surrender value of bank-owned life insurance policies	(714)us-gaap_BankOwnedLifeInsuranceIncome	(813)us-gaap_BankOwnedLifeInsuranceIncome
Gain on sales of securities, net	(34)	(34)
Net (increase) decrease in loans held for sale	(9,812)	8,171
Loss on disposition of assets	1,136us-gaap_GainLossOnDispositionOfAssets	834us-gaap_GainLossOnDispositionOfAssets
Loss on sale of real estate	154	208
Loss on termination of hedges		3,237bhlb_GainLossOnTerminationOfHedges
Amortization of interest in tax-advantaged projects	2,882bhlb_AmortizationOfTaxCredits	421bhlb_AmortizationOfTaxCredits
Net change in other	(6,145)us-gaap_OtherNoncashIncomeExpense	(183)us-gaap_OtherNoncashIncomeExpense
Net cash provided by operating activities	3,804	17,018
Cash flows from investing activities:
Net decrease in trading security	142	135
Proceeds from sales of securities available for sale	4,693	3,171
Proceeds from maturities, calls and prepayments of securities available for sale	40,552	25,440
Purchases of securities available for sale	(41,068)	(291,662)
Proceeds from maturities, calls and prepayments of securities held to maturity	729	1,762
Purchases of securities held to maturity	(200)
Net change in loans	(68,671)	(59,851)
Proceeds from sale of Federal Home Loan Bank stock	103	78
Purchase of Federal Home Loan Bank stock	(3,117)	(2,920)
Net investment in limited partnership tax credits		(2,500)
Purchase of premises and equipment, net	(946)	(3,130)
Acquisitions, net of cash paid		423,416
Proceeds from sale of other real estate	578	483
Net cash (used in) provided by investing activities	(67,205)	94,422
Cash flows from financing activities:
Net increase (decrease) in deposits	65,007us-gaap_IncreaseDecreaseInDeposits	(70,422)us-gaap_IncreaseDecreaseInDeposits
Proceeds from Federal Home Loan Bank advances and other borrowings	2,200,000	900,018
Repayments of Federal Home Loan Bank advances and other borrowings	(2,206,440)us-gaap_RepaymentsOfLongTermDebt	(937,682)us-gaap_RepaymentsOfLongTermDebt
Purchase of treasury stock		(2,467)
Exercise of stock options	116	719
Excess tax loss from stock-based payment arrangements	(23)	89
Common stock cash dividends paid	(4,799)us-gaap_PaymentsOfDividendsCommonStock	(4,561)us-gaap_PaymentsOfDividendsCommonStock
Net cash provided (used) by financing activities	53,861	(114,306)
Net change in cash and cash equivalents	(9,540)	(2,866)
Cash and cash equivalents at beginning of year	71,754	75,539
Cash and cash equivalents at end of year	62,214	72,673
Supplemental cash flow information:
Interest paid on deposits	4,902bhlb_InterestPaidOnDeposits	4,718bhlb_InterestPaidOnDeposits
Interest paid on borrowed funds	2,306us-gaap_InterestPaid	3,145us-gaap_InterestPaid
Income taxes (refunded) paid, net	274us-gaap_IncomeTaxesPaidNet	146us-gaap_IncomeTaxesPaidNet
Acquisition of non-cash assets and liabilities:
Assets acquired		18,064
Liabilities assumed		(441,550)
Other non-cash changes:
Other net comprehensive income	2,489	5,189
Real estate owned acquired in settlement of loans	$ 127	$ 476

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The total amount of [all] liabilities that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in 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 value of the noncash (or part noncash) consideration given (for example, liability, equity) in a transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of a transaction not resulting in cash receipts or cash payments in the period.

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The net cash outflow or inflow for the increase (decrease) in the beginning and end of period of loan and lease balances which are not originated or purchased specifically for resale. Includes cash payments and proceeds associated with (a) loans held-for-investment, (b) leases held-for-investment, and (c) both.

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-Name Accounting Standards Codification

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The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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The cash outflow to reacquire common stock during the period.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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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 outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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Amount of cash outflow to acquire Federal Reserve Bank (FRB) stock.

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Amount of cash outflow through purchase of long-term held-to-maturity securities.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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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 associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

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The cash inflow associated with the maturity, prepayments and calls (requests for early payments) of debt securities designated as held-to-maturity.

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- Definition

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

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- Definition

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

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- Definition

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

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- Definition

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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- Definition

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

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- Definition

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

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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