XML 24 R12.htm IDEA: XBRL DOCUMENT
v3.19.2

TRADING SECURITY | 6 Months Ended
--- | ---
Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract] |
TRADING SECURITY | TRADING SECURITY The Company holds a tax-advantaged economic development bond accounted for at fair value. The security had an amortized cost of $9.7 million and $10.1 million, and a fair value of $11.2 million and $11.2 million, at June 30, 2019 and December 31, 2018, respectively. As discussed further in Note 10 - Derivative Financial Instruments and Hedging Activities, the Company entered into a swap contract to swap-out the fixed rate of the security in exchange for a variable rate. The Company does not purchase securities with the intent of selling them in the near term, and there were no other securities in the trading portfolio at June 30, 2019.

X
- Definition The entire disclosure for trading securities. + References No definition available. + Details
Name: | bhlb_DisclosureOfTradingSecuritiesAndCertainTradingAssetsTextBlock
Namespace Prefix: | bhlb_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration