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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
Related party receivables:
Total Assets	$ 941,213us-gaap_Assets	$ 965,938us-gaap_Assets
Liabilities
Dividends payable	965us-gaap_DividendsPayableCurrentAndNoncurrent	967us-gaap_DividendsPayableCurrentAndNoncurrent
Total liabilities	826,720us-gaap_Liabilities	857,321us-gaap_Liabilities
Stockholders' Equity	114,493us-gaap_StockholdersEquity	108,617us-gaap_StockholdersEquity	110,489us-gaap_StockholdersEquity	105,339us-gaap_StockholdersEquity
Total Liabilities and Stockholders' Equity	941,213us-gaap_LiabilitiesAndStockholdersEquity	965,938us-gaap_LiabilitiesAndStockholdersEquity
Farmers & Merchants State Bank [Member]
Assets
Cash	302us-gaap_Cash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	322us-gaap_Cash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Related party receivables:
Dividends & Accounts receivable from subsidiary	2,030fmb_DividendAndAccountsReceivableFromSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	951fmb_DividendAndAccountsReceivableFromSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Accrued interest receivable Municipals	58fmb_AccruedInterestReceivableAndOtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	49fmb_AccruedInterestReceivableAndOtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Note receivable from Bank subsidiary	0fmb_NoteReceivableFromSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	0fmb_NoteReceivableFromSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Securities - Municipals	14,998us-gaap_MarketableSecuritiesEquitySecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	14,956us-gaap_MarketableSecuritiesEquitySecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Investment in subsidiaries	98,088us-gaap_EquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	93,436us-gaap_EquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total Assets	115,476us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	109,714us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Liabilities
Accrued expenses	18us-gaap_AccruedLiabilitiesCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	130us-gaap_AccruedLiabilitiesCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Dividends payable	965us-gaap_DividendsPayableCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	967us-gaap_DividendsPayableCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total liabilities	983us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	1,097us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Stockholders' Equity	114,493us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	108,617us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total Liabilities and Stockholders' Equity	$ 115,476us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	$ 109,714us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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