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Loans and Allowance for Credit Losses on Loans - Schedule of Purchased Loans with Credit Deterioration (Details) $ in Thousands	Aug. 06, 2021 USD ($)
Financing Receivable, Purchased with Credit Deterioration, Amount at Purchase Price [Abstract]
Unpaid principal balance (par value)	$ 92,029
Non-credit discount	(1,662)
Amortized cost basis	90,367
Initial allowance for credit losses on PCD loans	(1,505)
Purchase price (PCD loans at fair value)	$ 88,862

X

- Definition

Financing Receivable, Not Purchased With Credit Deterioration, Unpaid Principal Balance

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Financing Receivable Purchased With Credit Deterioration Amortized Cost

+ References

No definition available.

+ Details

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Namespace Prefix:	bmrc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of allowance for credit loss at acquisition date of financing receivable purchased with credit deterioration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 19
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919265-210447

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount at purchase price of financing receivable purchased with credit deterioration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 19
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919265-210447

+ Details

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Data Type:	xbrli:monetaryItemType
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- References

No definition available.

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Data Type:	xbrli:stringItemType
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Period Type:	duration

X

- Definition

Amount of discount (premium) attributable to other factors on financing receivable purchased with credit deterioration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 19
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919265-210447

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Balance Type:	credit
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