XML 54 R44.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Loans and Allowance for Loan Losses - Impaired and Related Allowance (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | $ 4,411,000 |  | $ 4,411,000 |  | $ 4,445,000
With a specific allowance recorded | 11,120,000 |  | 11,120,000 |  | 12,481,000
Total recorded investment in impaired loans | 15,531,000 |  | 15,531,000 |  | 16,926,000
Unpaid principal balance of impaired loans | 15,502,000 |  | 15,502,000 |  | 17,019,000
Specific allowance | 527,000 |  | 527,000 |  | 513,000
Average recorded investment in impaired loans during the period | 15,705,000 | $ 17,976,000 | 16,212,000 | $ 18,180,000 |
Interest income recognized on impaired loans during the period ended | 182,000 | 183,000 | 665,000 | 544,000 |
Interest income recognized on impaired loans during the period ended, cash basis | 6,000 | 0 | 134,000 | 0 |
Charge-off amounts on impaired loans |  |  | 0 |  | 0
Outstanding commitments to extend credit on impaired loans | 950,000 |  | 950,000 |  | 935,000
Commercial loans | Commercial and industrial |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 304,000 |  | 304,000 |  | 309,000
With a specific allowance recorded | 1,459,000 |  | 1,459,000 |  | 1,856,000
Total recorded investment in impaired loans | 1,763,000 |  | 1,763,000 |  | 2,165,000
Unpaid principal balance of impaired loans | 1,751,000 |  | 1,751,000 |  | 2,278,000
Specific allowance | 173,000 |  | 173,000 |  | 50,000
Average recorded investment in impaired loans during the period | 1,840,000 | 2,063,000 | 2,019,000 | 2,100,000 |
Interest income recognized on impaired loans during the period ended | 31,000 | 27,000 | 214,000 | 74,000 |
Commercial real estate loans | Commercial real estate, owner-occupied |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 0 |  | 0 |  | 0
With a specific allowance recorded | 6,997,000 |  | 6,997,000 |  | 6,999,000
Total recorded investment in impaired loans | 6,997,000 |  | 6,997,000 |  | 6,999,000
Unpaid principal balance of impaired loans | 6,993,000 |  | 6,993,000 |  | 6,993,000
Specific allowance | 228,000 |  | 228,000 |  | 188,000
Average recorded investment in impaired loans during the period | 7,000,000 | 7,000,000 | 7,002,000 | 6,998,000 |
Interest income recognized on impaired loans during the period ended | 67,000 | 67,000 | 199,000 | 199,000 |
Commercial real estate loans | Commercial real estate, investor |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 0 |  | 0 |  | 0
With a specific allowance recorded | 1,831,000 |  | 1,831,000 |  | 2,171,000
Total recorded investment in impaired loans | 1,831,000 |  | 1,831,000 |  | 2,171,000
Unpaid principal balance of impaired loans | 1,824,000 |  | 1,824,000 |  | 2,168,000
Specific allowance | 44,000 |  | 44,000 |  | 159,000
Average recorded investment in impaired loans during the period | 1,837,000 | 3,236,000 | 1,925,000 | 3,010,000 |
Interest income recognized on impaired loans during the period ended | 20,000 | 22,000 | 63,000 | 65,000 |
Commercial real estate loans | Construction |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 2,690,000 |  | 2,690,000 |  | 2,689,000
With a specific allowance recorded | 0 |  | 0 |  | 280,000
Total recorded investment in impaired loans | 2,690,000 |  | 2,690,000 |  | 2,969,000
Unpaid principal balance of impaired loans | 2,688,000 |  | 2,688,000 |  | 2,963,000
Specific allowance | 0 |  | 0 |  | 7,000
Average recorded investment in impaired loans during the period | 2,690,000 | 3,104,000 | 2,831,000 | 3,174,000 |
Interest income recognized on impaired loans during the period ended | 39,000 | 39,000 | 114,000 | 110,000 |
Residential loans | Home equity |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 318,000 |  | 318,000 |  | 406,000
With a specific allowance recorded | 251,000 |  | 251,000 |  | 347,000
Total recorded investment in impaired loans | 569,000 |  | 569,000 |  | 753,000
Unpaid principal balance of impaired loans | 567,000 |  | 567,000 |  | 750,000
Specific allowance | 5,000 |  | 5,000 |  | 6,000
Average recorded investment in impaired loans during the period | 651,000 | 607,000 | 698,000 | 660,000 |
Interest income recognized on impaired loans during the period ended | 5,000 | 5,000 | 15,000 | 19,000 |
Residential loans | Other residential |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 986,000 |  | 986,000 |  | 995,000
With a specific allowance recorded | 0 |  | 0 |  | 153,000
Total recorded investment in impaired loans | 986,000 |  | 986,000 |  | 1,148,000
Unpaid principal balance of impaired loans | 985,000 |  | 985,000 |  | 1,147,000
Specific allowance | 0 |  | 0 |  | 1,000
Average recorded investment in impaired loans during the period | 987,000 | 1,164,000 | 1,029,000 | 1,367,000 |
Interest income recognized on impaired loans during the period ended | 13,000 | 14,000 | 38,000 | 48,000 |
Consumer loans | Installment and other consumer |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 113,000 |  | 113,000 |  | 46,000
With a specific allowance recorded | 582,000 |  | 582,000 |  | 675,000
Total recorded investment in impaired loans | 695,000 |  | 695,000 |  | 721,000
Unpaid principal balance of impaired loans | 694,000 |  | 694,000 |  | 720,000
Specific allowance | 77,000 |  | 77,000 |  | $ 102,000
Average recorded investment in impaired loans during the period | 700,000 | 802,000 | 708,000 | 871,000 |
Interest income recognized on impaired loans during the period ended | $ 7,000 | $ 9,000 | $ 22,000 | $ 29,000 |

X
- Definition Loans And Leases Receivable, Impaired, Charge-offs + References No definition available. + Details
Name: | bmrc_LoansAndLeasesReceivableImpairedChargeoffs
Namespace Prefix: | bmrc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableRelatedAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in impaired financing receivables for which there is no related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in impaired financing receivables for which there is a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Reflects the unfunded portion of contractual agreements to lend funds to borrowers for loans whose terms have been modified by troubled debt restructuring. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18794-111554 + Details
Name: | us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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: |