XML 19 R37.htm IDEA: XBRL DOCUMENT
v3.2.0.727

Loans and Allowance for Loan Losses - Troubled Debt Restructuring Modifications (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 USD ($) contract | Jun. 30, 2014 USD ($) contract | Jun. 30, 2015 USD ($) loans contract | Jun. 30, 2014 USD ($) loans contract
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts Modified | contract | 5 | 6 | 5 | 13
Pre-Modification Outstanding Recorded Investment | $ 1,004 | $ 419 | $ 1,004 | $ 2,159
Post-Modification Outstanding Recorded Investment | 1,103 | 464 | 1,103 | 2,187
Post-Modification Outstanding Recorded Investment at period end | $ 1,103 | $ 463 | $ 1,103 | $ 1,896
Number of troubled debt restructurings | loans |  |  | 0 | 0
Commercial loans | Commercial and industrial |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts Modified | contract | 4 | 3 | 4 | 6
Pre-Modification Outstanding Recorded Investment | $ 782 | $ 308 | $ 782 | $ 1,728
Post-Modification Outstanding Recorded Investment | 882 | 354 | 882 | 1,759
Post-Modification Outstanding Recorded Investment at period end | $ 882 | $ 354 | $ 882 | $ 1,471
Commercial real estate loans | Commercial real estate, investor |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts Modified | contract | 1 |  | 1 |
Pre-Modification Outstanding Recorded Investment | $ 222 |  | $ 222 |
Post-Modification Outstanding Recorded Investment | 221 |  | 221 |
Post-Modification Outstanding Recorded Investment at period end | $ 221 |  | $ 221 |
Consumer loans | Installment and other consumer |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts Modified | contract |  | 3 |  | 6
Pre-Modification Outstanding Recorded Investment |  | $ 111 |  | $ 281
Post-Modification Outstanding Recorded Investment |  | 110 |  | 278
Post-Modification Outstanding Recorded Investment at period end |  | $ 109 |  | $ 276
Residential loans | Home equity |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts Modified | contract |  |  |  | 1
Pre-Modification Outstanding Recorded Investment |  |  |  | $ 150
Post-Modification Outstanding Recorded Investment |  |  |  | 150
Post-Modification Outstanding Recorded Investment at period end |  |  |  | $ 149

X
- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings at end of period. + References No definition available. + Details
Name: | bmrc_FinancingReceivableModificationsContractsModifiedDuringPeriodRecordedInvestment
Namespace Prefix: | bmrc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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_FinancingReceivableModificationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of 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 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Pre-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953682-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
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_CommercialRealEstateLoanInvestorMember
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: |

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: |