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Securities - Gross Realized Gains and Losses (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Available-for-sale Securities, Gross Realized Gain (Loss), Disclosures [Abstract] |  |  |
Gross realized gains | $ 638 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | $ 839 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | $ 852 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Gross realized losses | (144)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses | (64)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses |
Net realized gains | 494 us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet | 775 us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet | 852 us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
Tax expense related to net realized gains | $ 168 fmb_AvailableForSaleSecuritiesGrossRealizedGainLossTaxExpenses | $ 264 fmb_AvailableForSaleSecuritiesGrossRealizedGainLossTaxExpenses | $ 290 fmb_AvailableForSaleSecuritiesGrossRealizedGainLossTaxExpenses

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- Definition Available for sale securities gross realized gain loss tax expenses. + References No definition available. + Details
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- Details
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- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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