XML 169 R139.htm IDEA: XBRL DOCUMENT v3.6.0.2

FAIR VALUE MEASUREMENTS - Significant Unobservable Inputs for Non-recurring Assets (Details) - Non-recurring - Level 3 - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, fair value	$ 28,638,000	$ 18,569,000
Impaired loans
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, fair value	17,761,000	11,657,000
Impaired loans | Fair value of collateral
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, fair value	$ 17,761,000	$ 11,657,000
Impaired loans | Fair value of collateral | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loss severity (percent)	0.00%	0.05%
Appraised value	$ 0	$ 46,300
Impaired loans | Fair value of collateral | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loss severity (percent)	88.70%	29.50%
Appraised value	$ 2,192,000	$ 1,962,000
Impaired loans | Fair value of collateral | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loss severity (percent)	9.73%	7.55%
Appraised value	$ 1,026,000	$ 999,700
Capitalized servicing rights
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, fair value	10,726,000	5,187,000
Capitalized servicing rights | Discounted Cash Flow
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, fair value	$ 10,726,000	$ 5,187,000
Capitalized servicing rights | Discounted Cash Flow | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Constant prepayment rate (percent)	7.35%	7.17%
Discount Rate (percent)	10.00%	10.00%
Capitalized servicing rights | Discounted Cash Flow | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Constant prepayment rate (percent)	14.28%	12.06%
Discount Rate (percent)	14.00%	15.00%
Capitalized servicing rights | Discounted Cash Flow | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Constant prepayment rate (percent)	10.44%	10.02%
Discount Rate (percent)	11.77%	10.88%
Other real estate owned
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, fair value	$ 151,000	$ 1,725,000
Other real estate owned | Fair value of collateral
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, fair value	151,000	1,725,000
Other real estate owned | Fair value of collateral | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Appraised value	101,000	39,000
Other real estate owned | Fair value of collateral | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Appraised value	129,000	1,200,000
Other real estate owned | Fair value of collateral | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Appraised value	$ 122,000	$ 919,900

X

- Definition

Represents the appraised value used as an input to measure fair value.

+ References

No definition available.

+ Details

Name:	bhlb_FairValueInputsAppraisedValue
Namespace Prefix:	bhlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

+ Details

Name:	us-gaap_AssetsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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_FairValueInputsAssetsQuantitativeInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueInputsDiscountRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Loss, including interest and principal, incurred on a defaulted security, expressed as a percentage of the original principal balance, used as an input to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueInputsLossSeverity
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Rate at which loans or a loan portfolio are expected to prepay principal balances, used as an input to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueInputsPrepaymentRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=bhlb_ImpairedLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ValuationTechniqueAxis=bhlb_FairValueOfCollateralValuationTechniqueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_WeightedAverageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=bhlb_CapitalizedMortgageServicingRightsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ValuationTechniqueAxis=bhlb_DiscountedCashFlowValuationTechniqueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=bhlb_OtherRealEstateOwnedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: