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v2.4.1.9

Condensed Financial Statements of Parent Company - Statement of Income (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income |  |  |  |  |  |  |  |  |  |  |
Interest |  |  |  |  |  |  |  |  | $ 28,070 us-gaap_InterestAndFeeIncomeLoansAndLeases | $ 24,978 us-gaap_InterestAndFeeIncomeLoansAndLeases | $ 26,489 us-gaap_InterestAndFeeIncomeLoansAndLeases
Interest Municipals |  |  |  |  |  |  |  |  | 2,037 us-gaap_InterestIncomeSecuritiesStateAndMunicipal | 2,080 us-gaap_InterestIncomeSecuritiesStateAndMunicipal | 2,112 us-gaap_InterestIncomeSecuritiesStateAndMunicipal
Total interest income | 8,519 us-gaap_InterestAndDividendIncomeOperating | 8,471 us-gaap_InterestAndDividendIncomeOperating | 8,304 us-gaap_InterestAndDividendIncomeOperating | 8,159 us-gaap_InterestAndDividendIncomeOperating | 8,117 us-gaap_InterestAndDividendIncomeOperating | 7,844 us-gaap_InterestAndDividendIncomeOperating | 7,765 us-gaap_InterestAndDividendIncomeOperating | 7,702 us-gaap_InterestAndDividendIncomeOperating | 33,453 us-gaap_InterestAndDividendIncomeOperating | 31,428 us-gaap_InterestAndDividendIncomeOperating | 33,273 us-gaap_InterestAndDividendIncomeOperating
Income Before Income Taxes and Equity in Undistributed Earnings of Subsidiaries | 3,775 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 3,476 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 3,434 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 2,832 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 3,151 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 2,857 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 3,511 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 3,084 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 13,517 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 12,603 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 13,692 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income Taxes | 1,114 us-gaap_IncomeTaxExpenseBenefit | 1,002 us-gaap_IncomeTaxExpenseBenefit | 881 us-gaap_IncomeTaxExpenseBenefit | 874 us-gaap_IncomeTaxExpenseBenefit | 864 us-gaap_IncomeTaxExpenseBenefit | 791 us-gaap_IncomeTaxExpenseBenefit | 1,009 us-gaap_IncomeTaxExpenseBenefit | 932 us-gaap_IncomeTaxExpenseBenefit | 3,871 us-gaap_IncomeTaxExpenseBenefit | 3,596 us-gaap_IncomeTaxExpenseBenefit | 3,904 us-gaap_IncomeTaxExpenseBenefit
Net Income | 2,661 us-gaap_NetIncomeLoss | 2,474 us-gaap_NetIncomeLoss | 2,553 us-gaap_NetIncomeLoss | 1,958 us-gaap_NetIncomeLoss | 2,287 us-gaap_NetIncomeLoss | 2,066 us-gaap_NetIncomeLoss | 2,502 us-gaap_NetIncomeLoss | 2,152 us-gaap_NetIncomeLoss | 9,646 us-gaap_NetIncomeLoss | 9,007 us-gaap_NetIncomeLoss | 9,788 us-gaap_NetIncomeLoss
Other Comprehensive Loss: |  |  |  |  |  |  |  |  |  |  |
Unrealized gains (losses) on securities |  |  |  |  |  |  |  |  | 1,158 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax | (8,448)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax | 417 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Comprehensive Income |  |  |  |  |  |  |  |  | 10,084 us-gaap_ComprehensiveIncomeNetOfTax | 2,920 us-gaap_ComprehensiveIncomeNetOfTax | 9,500 us-gaap_ComprehensiveIncomeNetOfTax
Farmers & Merchants State Bank [Member] |  |  |  |  |  |  |  |  |  |  |
Income |  |  |  |  |  |  |  |  |  |  |
Dividends from subsidiary |  |  |  |  |  |  |  |  | 5,725 fmb_DividendIncomeOperatingFromBankSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,830 fmb_DividendIncomeOperatingFromBankSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,870 fmb_DividendIncomeOperatingFromBankSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest |  |  |  |  |  |  |  |  |  | 566 us-gaap_InterestAndFeeIncomeLoansAndLeases / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 713 us-gaap_InterestAndFeeIncomeLoansAndLeases / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest Municipals |  |  |  |  |  |  |  |  | 215 us-gaap_InterestIncomeSecuritiesStateAndMunicipal / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 30 us-gaap_InterestIncomeSecuritiesStateAndMunicipal / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Total interest income |  |  |  |  |  |  |  |  | 5,940 us-gaap_InterestAndDividendIncomeOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4,426 us-gaap_InterestAndDividendIncomeOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4,583 us-gaap_InterestAndDividendIncomeOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Operating Expenses |  |  |  |  |  |  |  |  | 577 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 304 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 305 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income Before Income Taxes and Equity in Undistributed Earnings of Subsidiaries |  |  |  |  |  |  |  |  | 5,363 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4,122 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4,278 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income Taxes |  |  |  |  |  |  |  |  | (196)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 89 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 139 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income from operation before equity in undistributed earnings of subsidiary |  |  |  |  |  |  |  |  | 5,559 fmb_IncomeFromOperationBeforeEquityInUndistributedEarningsOfSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4,033 fmb_IncomeFromOperationBeforeEquityInUndistributedEarningsOfSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4,139 fmb_IncomeFromOperationBeforeEquityInUndistributedEarningsOfSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity in undistributed earnings of Subsidiaries |  |  |  |  |  |  |  |  | 4,087 fmb_EquityInUndistributedEarningsDistributionsInExcessOfEarnings / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4,974 fmb_EquityInUndistributedEarningsDistributionsInExcessOfEarnings / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 5,649 fmb_EquityInUndistributedEarningsDistributionsInExcessOfEarnings / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net Income |  |  |  |  |  |  |  |  | 9,646 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 9,007 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 9,788 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other Comprehensive Loss: |  |  |  |  |  |  |  |  |  |  |
Unrealized gains (losses) on securities |  |  |  |  |  |  |  |  | 438 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (6,087)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (288)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Comprehensive Income |  |  |  |  |  |  |  |  | $ 10,084 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 2,920 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 9,500 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=35737396 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 + Details
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- Definition The aggregate interest and fee income generated by: (1) loans the Entity has positive intent and ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (a) industrial and agricultural; (b) real estate; and (c) real estate construction loans; (d) trade financing; (e) lease financing; (f) home equity lines-of-credit; (g) automobile and other vehicle loans; and (h) credit card and other revolving-type loans and (2) loans and leases held-for-sale which may include mortgage loans, direct financing, and sales-type leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1 -Article 9 + Details
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