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v2.4.1.9

Condensed Financial Statements of Parent Company - Statements of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Cash Flows from Operating Activities |  |  |
Net income | $ 9,646 us-gaap_NetIncomeLoss | $ 9,007 us-gaap_NetIncomeLoss | $ 9,788 us-gaap_NetIncomeLoss
Changes in Assets and Liabilities: |  |  |
Net cash provided by operating activities | 19,159 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | 16,993 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | 14,214 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash Flows from Investing Activities |  |  |
Net cash provided by (used in) investing activities | 22,507 us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations | (31,957)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations | (26,454)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash Flows from Financing Activities |  |  |
Payment of dividends | (3,864)us-gaap_PaymentsOfDividendsCommonStock | (3,719)us-gaap_PaymentsOfDividendsCommonStock | (3,597)us-gaap_PaymentsOfDividendsCommonStock
Purchase of Treasury Stock | (576)us-gaap_PaymentsForRepurchaseOfCommonStock | (1,236)us-gaap_PaymentsForRepurchaseOfCommonStock | (894)us-gaap_PaymentsForRepurchaseOfCommonStock
Net cash provided by (used in) financing activities | (36,634)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations | (9,865)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations | 13,189 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net Change in Cash and Cash Equivalents | 5,032 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (24,829)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 949 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and Cash Equivalents |  |  |
Cash and Cash Equivalents - Beginning of Year | 19,263 us-gaap_CashAndCashEquivalentsAtCarryingValue | 44,092 us-gaap_CashAndCashEquivalentsAtCarryingValue | 43,143 us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and Cash Equivalents - End of Year | 24,295 us-gaap_CashAndCashEquivalentsAtCarryingValue | 19,263 us-gaap_CashAndCashEquivalentsAtCarryingValue | 44,092 us-gaap_CashAndCashEquivalentsAtCarryingValue
Farmers & Merchants State Bank [Member] |  |  |
Cash Flows from Operating Activities |  |  |
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
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities: |  |  |
Equity in undistributed net income (Distributions in excess 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
Accretion & Amortization of Securities | 146 us-gaap_AccretionExpenseIncludingAssetRetirementObligations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 21 us-gaap_AccretionExpenseIncludingAssetRetirementObligations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Changes in Assets and Liabilities: |  |  |
Dividends receivable | (1,025)us-gaap_IncreaseDecreaseInDividendsReceivable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (10)us-gaap_IncreaseDecreaseInDividendsReceivable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 260 us-gaap_IncreaseDecreaseInDividendsReceivable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other Assets and Liabilities | (12)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 52 us-gaap_IncreaseDecreaseInOtherOperatingLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 282 us-gaap_IncreaseDecreaseInOtherOperatingLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash provided by operating activities | 4,668 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4,096 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4,681 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash Flows from Investing Activities |  |  |
Investing in Subsidiary | (250)us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Purchase of Available for Sale Securities |  | (14,992)us-gaap_PaymentsToAcquireMarketableSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Repayment of Subsidiary Subordinated Debt |  | 15,000 us-gaap_RepaymentsOfSubordinatedDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Net cash provided by (used in) investing activities | (250)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 8 us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Cash Flows from Financing Activities |  |  |
Payment of dividends | (3,862)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (3,719)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (3,597)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Purchase of Treasury Stock | (576)us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1,236)us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (894)us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash provided by (used in) financing activities | (4,438)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (4,955)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (4,491)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net Change in Cash and Cash Equivalents | (20)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (851)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 190 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash and Cash Equivalents |  |  |
Cash and Cash Equivalents - Beginning of Year | 322 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,173 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 983 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash and Cash Equivalents - End of Year | $ 302 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 322 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 1,173 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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