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LOANS - Unamortized Net Costs and Premiums (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Receivables [Abstract]
Unamortized net loan origination costs	$ 13,259	$ 25,761
Unamortized net premium on purchased loans	2,643	2,792
Total unamortized net costs and premiums	$ 15,902	$ 28,553

X

- Definition

Represents the amount of premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield.

+ References

No definition available.

+ Details

Name:	bhlb_UnamortizedDiscountsOrPremiums
Namespace Prefix:	bhlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases.

+ References

No definition available.

+ Details

Name:	bhlb_UnamortizedLoanOriginationFees
Namespace Prefix:	bhlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_ReceivablesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6378536&loc=d3e10092-111533

+ Details

Name:	us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant