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v2.4.1.9

Condensed Financial Statements of Parent Company - Balance Sheet (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
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Related party receivables: |  |  |  |
Total Assets | $ 941,213 us-gaap_Assets | $ 965,938 us-gaap_Assets |  |
Liabilities |  |  |  |
Dividends payable | 965 us-gaap_DividendsPayableCurrentAndNoncurrent | 967 us-gaap_DividendsPayableCurrentAndNoncurrent |  |
Total liabilities | 826,720 us-gaap_Liabilities | 857,321 us-gaap_Liabilities |  |
Stockholders' Equity | 114,493 us-gaap_StockholdersEquity | 108,617 us-gaap_StockholdersEquity | 110,489 us-gaap_StockholdersEquity | 105,339 us-gaap_StockholdersEquity
Total Liabilities and Stockholders' Equity | 941,213 us-gaap_LiabilitiesAndStockholdersEquity | 965,938 us-gaap_LiabilitiesAndStockholdersEquity |  |
Farmers & Merchants State Bank [Member] |  |  |  |
Assets |  |  |  |
Cash | 302 us-gaap_Cash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 322 us-gaap_Cash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Related party receivables: |  |  |  |
Dividends & Accounts receivable from subsidiary | 2,030 fmb_DividendAndAccountsReceivableFromSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 951 fmb_DividendAndAccountsReceivableFromSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Accrued interest receivable Municipals | 58 fmb_AccruedInterestReceivableAndOtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 49 fmb_AccruedInterestReceivableAndOtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Note receivable from Bank subsidiary | 0 fmb_NoteReceivableFromSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 fmb_NoteReceivableFromSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Securities - Municipals | 14,998 us-gaap_MarketableSecuritiesEquitySecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 14,956 us-gaap_MarketableSecuritiesEquitySecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Investment in subsidiaries | 98,088 us-gaap_EquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 93,436 us-gaap_EquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total Assets | 115,476 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 109,714 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Liabilities |  |  |  |
Accrued expenses | 18 us-gaap_AccruedLiabilitiesCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 130 us-gaap_AccruedLiabilitiesCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Dividends payable | 965 us-gaap_DividendsPayableCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 967 us-gaap_DividendsPayableCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total liabilities | 983 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,097 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Stockholders' Equity | 114,493 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 108,617 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total Liabilities and Stockholders' Equity | $ 115,476 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 109,714 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |

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