XML 82 R70.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Loans and Allowance for Credit Losses - 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
Name: | bmrc_FinancingReceivableNotPurchasedWithCreditDeteriorationUnpaidPrincipalBalance
Namespace Prefix: | bmrc_
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
Name: | bmrc_FinancingReceivablePurchasedWithCreditDeteriorationAmortizedCost
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
Name: | us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate
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
Name: | us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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