XML 50 R40.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Loans and Allowance for Loan Losses - Impaired Loans and Related Allowance (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | $ 5,363,000 |  | $ 5,363,000 |  | $ 4,209,000
With a specific allowance recorded | 12,337,000 |  | 12,337,000 |  | 14,104,000
Total recorded investment in impaired loans | 17,700,000 |  | 17,700,000 |  | 18,313,000
Unpaid principal balance of impaired loans | 17,675,000 |  | 17,675,000 |  | 18,270,000
Specific allowance | 586,000 |  | 586,000 |  | 991,000
Average recorded investment in impaired loans during the period | 17,976,000 | $ 21,139,000 | 18,180,000 | $ 21,788,000 |
Interest income recognized on impaired loans during the period ended | 183,000 | 1,600,000 | 544,000 | 2,021,000 |
Interest income recognized on impaired loans during the period ended, cash basis | 0 | 1,400,000.0 | 0 | 1,400,000.0 |
Outstanding commitments to extend credit on impaired loans | 1,100,000 |  | 1,100,000 |  | 1,600,000
Commercial loans | Commercial and industrial |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 311,000 |  | 311,000 |  | 315,000
With a specific allowance recorded | 1,740,000 |  | 1,740,000 |  | 1,892,000
Total recorded investment in impaired loans | 2,051,000 |  | 2,051,000 |  | 2,207,000
Unpaid principal balance of impaired loans | 2,030,000 |  | 2,030,000 |  | 2,177,000
Specific allowance | 35,000 |  | 35,000 |  | 285,000
Average recorded investment in impaired loans during the period | 2,063,000 | 3,352,000 | 2,100,000 | 3,802,000 |
Interest income recognized on impaired loans during the period ended | 27,000 | 44,000 | 74,000 | 142,000 |
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 | 6,999,000 |  | 6,999,000 |  | 6,993,000
Total recorded investment in impaired loans | 6,999,000 |  | 6,999,000 |  | 6,993,000
Unpaid principal balance of impaired loans | 6,993,000 |  | 6,993,000 |  | 6,993,000
Specific allowance | 84,000 |  | 84,000 |  | 163,000
Average recorded investment in impaired loans during the period | 7,000,000 | 7,169,000 | 6,998,000 | 7,081,000 |
Interest income recognized on impaired loans during the period ended | 67,000 | 67,000 | 199,000 | 133,000 |
Commercial real estate loans | Commercial real estate, investor |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 1,024,000 |  | 1,024,000 |  | 0
With a specific allowance recorded | 2,193,000 |  | 2,193,000 |  | 2,256,000
Total recorded investment in impaired loans | 3,217,000 |  | 3,217,000 |  | 2,256,000
Unpaid principal balance of impaired loans | 3,230,000 |  | 3,230,000 |  | 2,252,000
Specific allowance | 369,000 |  | 369,000 |  | 375,000
Average recorded investment in impaired loans during the period | 3,236,000 | 3,146,000 | 3,010,000 | 3,397,000 |
Interest income recognized on impaired loans during the period ended | 22,000 | 1,385,000 | 65,000 | 1,489,000 |
Commercial real estate loans | Construction |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 2,691,000 |  | 2,691,000 |  | 2,692,000
With a specific allowance recorded | 278,000 |  | 278,000 |  | 553,000
Total recorded investment in impaired loans | 2,969,000 |  | 2,969,000 |  | 3,245,000
Unpaid principal balance of impaired loans | 2,963,000 |  | 2,963,000 |  | 3,238,000
Specific allowance | 5,000 |  | 5,000 |  | 8,000
Average recorded investment in impaired loans during the period | 3,104,000 | 3,238,000 | 3,174,000 | 3,238,000 |
Interest income recognized on impaired loans during the period ended | 39,000 | 32,000 | 110,000 | 105,000 |
Residential loans | Home equity |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 292,000 |  | 292,000 |  | 91,000
With a specific allowance recorded | 348,000 |  | 348,000 |  | 624,000
Total recorded investment in impaired loans | 640,000 |  | 640,000 |  | 715,000
Unpaid principal balance of impaired loans | 637,000 |  | 637,000 |  | 713,000
Specific allowance | 6,000 |  | 6,000 |  | 7,000
Average recorded investment in impaired loans during the period | 607,000 | 1,140,000 | 660,000 | 1,098,000 |
Interest income recognized on impaired loans during the period ended | 5,000 | 38,000 | 19,000 | 48,000 |
Residential loans | Other residential |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 998,000 |  | 998,000 |  | 1,008,000
With a specific allowance recorded | 160,000 |  | 160,000 |  | 957,000
Total recorded investment in impaired loans | 1,158,000 |  | 1,158,000 |  | 1,965,000
Unpaid principal balance of impaired loans | 1,157,000 |  | 1,157,000 |  | 1,965,000
Specific allowance | 2,000 |  | 2,000 |  | 55,000
Average recorded investment in impaired loans during the period | 1,164,000 | 1,981,000 | 1,367,000 | 1,993,000 |
Interest income recognized on impaired loans during the period ended | 14,000 | 22,000 | 48,000 | 67,000 |
Consumer loans | Installment and other consumer |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 47,000 |  | 47,000 |  | 103,000
With a specific allowance recorded | 619,000 |  | 619,000 |  | 829,000
Total recorded investment in impaired loans | 666,000 |  | 666,000 |  | 932,000
Unpaid principal balance of impaired loans | 665,000 |  | 665,000 |  | 932,000
Specific allowance | 85,000 |  | 85,000 |  | $ 98,000
Average recorded investment in impaired loans during the period | 802,000 | 1,113,000 | 871,000 | 1,179,000 |
Interest income recognized on impaired loans during the period ended | $ 9,000 | $ 12,000 | $ 29,000 | $ 37,000 |

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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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: |