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DEPOSITS - Schedule of Time Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deposits [Abstract]
Time less than $100,000	$ 622,478	$ 579,856
Time $100,000 through $250,000	193,535	167,145
Time $250,000 or more	116,780	119,345
Total time deposits	932,793	866,346
Brokered time deposits	466,900	378,700
Reciprocal deposits	$ 52,400	$ 49,700

X

- Definition

Represents the amount of time deposits placed by or through the assistance of a deposit broker, also known as brokered deposit liabilities.

+ References

No definition available.

+ Details

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X

- Definition

Represents the reciprocal deposits.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Definition

Time Deposits, $100,000 to $250,000

+ References

No definition available.

+ Details

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X

- Definition

Time Deposits, $250,000 or More

+ References

No definition available.

+ Details

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Namespace Prefix:	bhb_
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- References

No definition available.

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X

- Definition

Amount of time deposit liabilities, including certificates of deposit.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 405
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=50488274&loc=d3e64164-112818

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.12)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

Amount of time deposit liabilities, including certificates of deposit, in denominations of less than $100,000.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher SEC
-Name Industry Guide
-Number 3
-Section V
-Paragraph D-E

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