XML 37 R36.htm IDEA: XBRL DOCUMENT
v3.3.0.814

Loans and Allowance for Loan Losses - Troubled Debt Restructuring by Class (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2015 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) loans | Sep. 30, 2014 USD ($) | Dec. 31, 2014 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Number of loans removed from TDR designation | loans |  |  |  | 4 |  |
Loans removed from TDR designation, recorded investment |  |  |  | $ 1,400,000 |  | $ 0
Recorded investment in Troubled Debt Restructurings |  | $ 18,912,000 |  | 18,912,000 |  | 22,703,000
TDR loans accruing interest as of period end |  | 18,800,000 |  | 18,800,000 |  | 15,900,000
TDR loans acquired |  | 147,000 |  | 147,000 |  | 1,800,000
Charge-off to allowance for loan losses |  | 3,000 | $ 2,000 | 856,000 | $ 276,000 |
Commercial loans | Commercial and industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Recorded investment in Troubled Debt Restructurings |  | 4,098,000 |  | 4,098,000 |  | 3,584,000
Charge-off to allowance for loan losses |  | 2,000 | 0 | 5,000 | 66,000 |
Commercial real estate loans | Commercial real estate, owner-occupied |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Recorded investment in Troubled Debt Restructurings |  | 6,993,000 |  | 6,993,000 |  | 8,459,000
Charge-off to allowance for loan losses |  | 0 | 0 | 0 | 0 |
Commercial real estate loans | Commercial real estate, investor |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Recorded investment in Troubled Debt Restructurings |  | 733,000 |  | 733,000 |  | 524,000
Charge-off to allowance for loan losses |  | 0 | 0 | 0 | 0 |
Commercial real estate loans | Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Recorded investment in Troubled Debt Restructurings |  | 3,238,000 |  | 3,238,000 |  | 5,684,000
Loan value transferred to held-for-sale | $ 1,500,000 |  |  |  |  |
Charge-off to allowance for loan losses | $ 839,000 | 0 | 0 | 839,000 | 204,000 |
Residential loans | Home equity |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Recorded investment in Troubled Debt Restructurings |  | 463,000 |  | 463,000 |  | 694,000
Charge-off to allowance for loan losses |  | 0 | 0 | 0 | 0 |
Residential loans | Other residential |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Recorded investment in Troubled Debt Restructurings |  | 2,020,000 |  | 2,020,000 |  | 2,045,000
Charge-off to allowance for loan losses |  | 0 | 0 | 0 | 0 |
Consumer loans | Installment and other consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Recorded investment in Troubled Debt Restructurings |  | 1,367,000 |  | 1,367,000 |  | $ 1,713,000
Charge-off to allowance for loan losses |  | $ 1,000 | $ 2,000 | $ 12,000 | $ 6,000 |

X
- Definition Reflects the carrying amount of trouble debt restructured loans on which interest is continuing to be accrued. + References No definition available. + Details
Name: | bmrc_FinancingReceivableModificationsAccruing
Namespace Prefix: | bmrc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Financing Receivable, Modifications, Removal From Troubled Debt Restructuring, Number Of Contracts + References No definition available. + Details
Name: | bmrc_FinancingReceivableModificationsRemovalFromTroubledDebtRestructuringNumberOfContracts
Namespace Prefix: | bmrc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Financing Receivable, Modifications, Removal From Troubled Debt Restructuring, Recorded Investment + References No definition available. + Details
Name: | bmrc_FinancingReceivableModificationsRemovalFromTroubledDebtRestructuringRecordedInvestment
Namespace Prefix: | bmrc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Troubled Debt Restructuring, Loans Acquired + References No definition available. + Details
Name: | bmrc_TroubledDebtRestructuringLoansAcquired
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_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + Details
Name: | us-gaap_FinancingReceivableModificationsRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of financing receivables reclassified to held for sale during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableReclassificationToHeldForSale
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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: |