XML 68 R56.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Loans and Allowance for Loan Losses - Impaired Loans and Related Allowance (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Recorded investment in impaired loans: |  |  |
With no specific allowance recorded | $ 4,445,000 | $ 4,209,000 |
With a specific allowance recorded | 12,481,000 | 14,104,000 |
Total recorded investment in impaired loans | 16,926,000 | 18,313,000 |
Unpaid principal balance of impaired loans: |  |  |
Total unpaid principal balance of impaired loans | 17,019,000 | 18,270,000 |
Specific valuation | 513,000 | 991,000 |
Average recorded investment in impaired loans during the period | 17,929,000 | 20,835,000 | $ 23,273,000
Interest income recognized on impaired loans | 825,000 | 2,223,000 | 826,000
Charged-off portion of impaired loans | 0 | 0 |
Outstanding commitments to extend credit on impaired loans | 935,000 | 1,600,000 |
Interest income recognized on impaired loans during the period ended, cash basis | 100,000 | 1,400,000 | 0
Commercial | Commercial and industrial |  |  |
Recorded investment in impaired loans: |  |  |
With no specific allowance recorded | 309,000 | 315,000 |
With a specific allowance recorded | 1,856,000 | 1,892,000 |
Total recorded investment in impaired loans | 2,165,000 | 2,207,000 |
Unpaid principal balance of impaired loans: |  |  |
Total unpaid principal balance of impaired loans | 2,278,000 | 2,177,000 |
Specific valuation | 50,000 | 285,000 |
Average recorded investment in impaired loans during the period | 2,113,000 | 3,514,000 | 4,237,000
Interest income recognized on impaired loans | 202,000 | 175,000 | 238,000
Commercial real estate | Commercial real estate, owner-occupied |  |  |
Recorded investment in impaired loans: |  |  |
With no specific allowance recorded | 0 | 0 |
With a specific allowance recorded | 6,999,000 | 6,993,000 |
Total recorded investment in impaired loans | 6,999,000 | 6,993,000 |
Unpaid principal balance of impaired loans: |  |  |
Total unpaid principal balance of impaired loans | 6,993,000 | 6,993,000 |
Specific valuation | 188,000 | 163,000 |
Average recorded investment in impaired loans during the period | 6,998,000 | 7,069,000 | 7,886,000
Interest income recognized on impaired loans | 266,000 | 199,000 | 295,000
Commercial real estate | Commercial real estate, investor |  |  |
Recorded investment in impaired loans: |  |  |
With no specific allowance recorded | 0 | 0 |
With a specific allowance recorded | 2,171,000 | 2,256,000 |
Total recorded investment in impaired loans | 2,171,000 | 2,256,000 |
Unpaid principal balance of impaired loans: |  |  |
Total unpaid principal balance of impaired loans | 2,168,000 | 2,252,000 |
Specific valuation | 159,000 | 375,000 |
Average recorded investment in impaired loans during the period | 2,842,000 | 2,950,000 | 2,833,000
Interest income recognized on impaired loans | 87,000 | 1,514,000 | 33,000
Commercial real estate | Construction |  |  |
Recorded investment in impaired loans: |  |  |
With no specific allowance recorded | 2,689,000 | 2,692,000 |
With a specific allowance recorded | 280,000 | 553,000 |
Total recorded investment in impaired loans | 2,969,000 | 3,245,000 |
Unpaid principal balance of impaired loans: |  |  |
Total unpaid principal balance of impaired loans | 2,963,000 | 3,238,000 |
Specific valuation | 7,000 | 8,000 |
Average recorded investment in impaired loans during the period | 3,132,000 | 3,242,000 | 4,164,000
Interest income recognized on impaired loans | 147,000 | 137,000 | 86,000
Residential loans | Home equity |  |  |
Recorded investment in impaired loans: |  |  |
With no specific allowance recorded | 406,000 | 91,000 |
With a specific allowance recorded | 347,000 | 624,000 |
Total recorded investment in impaired loans | 753,000 | 715,000 |
Unpaid principal balance of impaired loans: |  |  |
Total unpaid principal balance of impaired loans | 750,000 | 713,000 |
Specific valuation | 6,000 | 7,000 |
Average recorded investment in impaired loans during the period | 679,000 | 945,000 | 602,000
Interest income recognized on impaired loans | 24,000 | 60,000 | 18,000
Residential loans | Other residential |  |  |
Recorded investment in impaired loans: |  |  |
With no specific allowance recorded | 995,000 | 1,008,000 |
With a specific allowance recorded | 153,000 | 957,000 |
Total recorded investment in impaired loans | 1,148,000 | 1,965,000 |
Unpaid principal balance of impaired loans: |  |  |
Total unpaid principal balance of impaired loans | 1,147,000 | 1,965,000 |
Specific valuation | 1,000 | 55,000 |
Average recorded investment in impaired loans during the period | 1,324,000 | 1,988,000 | 2,028,000
Interest income recognized on impaired loans | 62,000 | 90,000 | 92,000
Consumer loans | Installment and other consumer |  |  |
Recorded investment in impaired loans: |  |  |
With no specific allowance recorded | 46,000 | 103,000 |
With a specific allowance recorded | 675,000 | 829,000 |
Total recorded investment in impaired loans | 721,000 | 932,000 |
Unpaid principal balance of impaired loans: |  |  |
Total unpaid principal balance of impaired loans | 720,000 | 932,000 |
Specific valuation | 102,000 | 98,000 |
Average recorded investment in impaired loans during the period | 841,000 | 1,127,000 | 1,523,000
Interest income recognized on impaired loans | $ 37,000 | $ 48,000 | $ 64,000

X
- Definition The portion of impaired loans that have been charged off partially. + References No definition available. + Details
Name: | bmrc_FinancingReceivableImpairedLoansPortionOfLoansChargedOff
Namespace Prefix: | bmrc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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: |