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Securities Sold Under Agreement to Repurchase - Daily Securities Sold under Agreement to Repurchase (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Daily Securities Sold Under Agreement to Repurchase [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Amount Outstanding at End of Period | $ 38,493 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_CashAndCashEquivalentsAxis = fmb_DailySecuritiesMember | $ 38,503 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_CashAndCashEquivalentsAxis = fmb_DailySecuritiesMember
Weighted Average Rate End of Period | 0.08%fmb_SecuritiesSoldUnderAgreementsToRepurchaseWeightedAverageInterestRate / us-gaap_CashAndCashEquivalentsAxis = fmb_DailySecuritiesMember | 0.08%fmb_SecuritiesSoldUnderAgreementsToRepurchaseWeightedAverageInterestRate / us-gaap_CashAndCashEquivalentsAxis = fmb_DailySecuritiesMember
Maximum Amount Borrowings Outstanding Month End | 46,475 fmb_SecuritiesSoldUnderAgreementsToRepurchaseMaximumMonthlyOutstandingAmount / us-gaap_CashAndCashEquivalentsAxis = fmb_DailySecuritiesMember | 48,366 fmb_SecuritiesSoldUnderAgreementsToRepurchaseMaximumMonthlyOutstandingAmount / us-gaap_CashAndCashEquivalentsAxis = fmb_DailySecuritiesMember
Approximate Average Outstanding in Period | 42,222 fmb_SecuritiesSoldUnderAgreementsToRepurchaseAverageOutstandingAmountInPeriod / us-gaap_CashAndCashEquivalentsAxis = fmb_DailySecuritiesMember | 38,859 fmb_SecuritiesSoldUnderAgreementsToRepurchaseAverageOutstandingAmountInPeriod / us-gaap_CashAndCashEquivalentsAxis = fmb_DailySecuritiesMember
Approximate Weighted Average Interest Rate For the Period | 0.09%fmb_SecuritiesSoldUnderAgreementsToRepurchaseWeightedAverageInterestRateDuringPeriod / us-gaap_CashAndCashEquivalentsAxis = fmb_DailySecuritiesMember | 0.09%fmb_SecuritiesSoldUnderAgreementsToRepurchaseWeightedAverageInterestRateDuringPeriod / us-gaap_CashAndCashEquivalentsAxis = fmb_DailySecuritiesMember
Term CDs Sold Under Agreement to Repurchase [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Amount Outstanding at End of Period | 17,469 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember | 17,253 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember
Weighted Average Rate End of Period | 1.25%fmb_SecuritiesSoldUnderAgreementsToRepurchaseWeightedAverageInterestRate / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember | 1.25%fmb_SecuritiesSoldUnderAgreementsToRepurchaseWeightedAverageInterestRate / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember
Maximum Amount Borrowings Outstanding Month End | 17,469 fmb_SecuritiesSoldUnderAgreementsToRepurchaseMaximumMonthlyOutstandingAmount / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember | 17,291 fmb_SecuritiesSoldUnderAgreementsToRepurchaseMaximumMonthlyOutstandingAmount / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember
Approximate Average Outstanding in Period | $ 17,337 fmb_SecuritiesSoldUnderAgreementsToRepurchaseAverageOutstandingAmountInPeriod / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember | $ 17,095 fmb_SecuritiesSoldUnderAgreementsToRepurchaseAverageOutstandingAmountInPeriod / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember
Approximate Weighted Average Interest Rate For the Period | 1.24%fmb_SecuritiesSoldUnderAgreementsToRepurchaseWeightedAverageInterestRateDuringPeriod / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember | 1.25%fmb_SecuritiesSoldUnderAgreementsToRepurchaseWeightedAverageInterestRateDuringPeriod / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember

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- Definition Securities Sold Under Agreements To Repurchase Average Outstanding Amount In Period + References No definition available. + Details
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- Definition Securities Sold Under Agreements To Repurchase Maximum Monthly Outstanding Amount + References No definition available. + Details
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- Definition Securities Sold Under Agreements To Repurchase Weighted Average Interest Rate + References No definition available. + Details
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- Definition Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226008-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph 1 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=45278096&loc=d3e9760-107771 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(a)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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