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Federal Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Deferred Tax Assets: |  |
Allowance for loan losses | $ 2,030 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses | $ 1,766 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses
Other | 416 us-gaap_DeferredTaxAssetsOther | 788 us-gaap_DeferredTaxAssetsOther
Total deferred tax assets | 2,446 us-gaap_DeferredTaxAssetsGross | 2,554 us-gaap_DeferredTaxAssetsGross
Deferred Tax Liabilities: |  |
Accreted discounts on bonds | 83 fmb_DeferredTaxLiabilitiesAccretedDiscountsOnBonds | 73 fmb_DeferredTaxLiabilitiesAccretedDiscountsOnBonds
FHLB stock dividends | 746 fmb_DeferredTaxLiabilitiesFhlbStockDividends | 859 fmb_DeferredTaxLiabilitiesFhlbStockDividends
Mortgage servicing rights | 696 us-gaap_DeferredTaxLiabilitiesMortgageServicingRights | 702 us-gaap_DeferredTaxLiabilitiesMortgageServicingRights
Other | 1,160 us-gaap_DeferredTaxLiabilitiesOther | 1,121 us-gaap_DeferredTaxLiabilitiesOther
Net unrealized gain on available-for-sale securities | 229 fmb_DeferredTaxLiabilitiesNetUnrealizedGainOnAvailableForSaleSecurities | 3 fmb_DeferredTaxLiabilitiesNetUnrealizedGainOnAvailableForSaleSecurities
Total deferred tax liabilities | 2,914 us-gaap_DeferredIncomeTaxLiabilities | 2,758 us-gaap_DeferredIncomeTaxLiabilities
Net Deferred Tax Liability | $ (468)us-gaap_DeferredTaxAssetsLiabilitiesNet | $ (204)us-gaap_DeferredTaxAssetsLiabilitiesNet

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- Definition Amount of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Liability -URI http://asc.fasb.org/extlink&oid=6510232 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph b(2) -Article 7 + Details
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