XML 51 R41.htm IDEA: XBRL DOCUMENT v3.10.0.1

Loans and Allowance for Loan Losses - Credit Quality (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 1,728,871	$ 1,679,013
Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,693,389	1,629,865
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	23,081	21,242
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	12,401	27,906
Purchased credit-impaired
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	2,129	2,115
Purchased credit-impaired | Pass
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	2,129	1,325
Purchased credit-impaired | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	0	790
Purchased credit-impaired | Substandard
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	0	0
Commercial loans | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	238,732	235,770
Total loans	238,771	235,835
Commercial loans | Commercial and industrial | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	223,259	214,636
Commercial loans | Commercial and industrial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	14,574	9,318
Commercial loans | Commercial and industrial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	899	11,816
Commercial loans | Purchased credit-impaired | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	39	65
Commercial real estate loans | Commercial real estate, owner-occupied
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	315,269	299,797
Total loans	316,467	300,963
Commercial real estate loans | Commercial real estate, owner-occupied | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	302,082	281,104
Commercial real estate loans | Commercial real estate, owner-occupied | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	5,192	9,284
Commercial real estate loans | Commercial real estate, owner-occupied | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	7,995	9,409
Commercial real estate loans | Commercial real estate, investor
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	840,687	822,194
Total loans	841,493	822,984
Commercial real estate loans | Commercial real estate, investor | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	838,493	818,570
Commercial real estate loans | Commercial real estate, investor | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	2,194	1,850
Commercial real estate loans | Commercial real estate, investor | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	0	1,774
Commercial real estate loans | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	68,739	63,828
Total loans	68,739	63,828
Commercial real estate loans | Construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	66,049	60,859
Commercial real estate loans | Construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	0	0
Commercial real estate loans | Construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	2,690	2,969
Commercial real estate loans | Purchased credit-impaired | Commercial real estate, owner-occupied
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	1,198	1,166
Commercial real estate loans | Purchased credit-impaired | Commercial real estate, investor
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	806	790
Commercial real estate loans | Purchased credit-impaired | Construction
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	0	0
Residential loans | Home equity
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	121,157	132,373
Total loans	121,243	132,467
Residential loans | Home equity | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	119,383	130,558
Residential loans | Home equity | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	1,121	0
Residential loans | Home equity | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	653	1,815
Residential loans | Other residential
Financing Receivable, Recorded Investment [Line Items]
Total loans	113,383	95,526
Residential loans | Other residential | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	113,383	95,526
Residential loans | Other residential | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Residential loans | Other residential | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Residential loans | Purchased credit-impaired | Home equity
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	86	94
Residential loans | Purchased credit-impaired | Other residential
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	0	0
Consumer loans | Installment and other consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	28,775	27,410
Consumer loans | Installment and other consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	28,611	27,287
Consumer loans | Installment and other consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Consumer loans | Installment and other consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	164	123
Consumer loans | Purchased credit-impaired | Installment and other consumer
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	$ 0	$ 0

X

- Definition

Loans and Leases Receivable, Net of Deferred Income, Excluding Purchased Credit-impaired Loans

+ References

No definition available.

+ Details

Name:	bmrc_LoansAndLeasesReceivableNetOfDeferredIncomeExcludingPurchasedCreditImpairedLoans
Namespace Prefix:	bmrc_
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_FinancingReceivableRecordedInvestmentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes 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 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524

+ Details

Name:	us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_NotesReceivableNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_PassMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_SpecialMentionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_SubstandardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreditLossStatusAxis=us-gaap_FinancialAssetAcquiredWithCreditDeteriorationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=bmrc_CommercialAndIndustrialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=bmrc_CommercialRealEstateLoanOwnerOccupiedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=bmrc_CommercialRealEstateLoanInvestorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConstructionLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_HomeEquityLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=bmrc_OtherResidentialLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=bmrc_InstallmentAndOtherConsumerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: