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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
	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	$ 38,493us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_CashAndCashEquivalentsAxis = fmb_DailySecuritiesMember	$ 38,503us-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	46,475fmb_SecuritiesSoldUnderAgreementsToRepurchaseMaximumMonthlyOutstandingAmount / us-gaap_CashAndCashEquivalentsAxis = fmb_DailySecuritiesMember	48,366fmb_SecuritiesSoldUnderAgreementsToRepurchaseMaximumMonthlyOutstandingAmount / us-gaap_CashAndCashEquivalentsAxis = fmb_DailySecuritiesMember
Approximate Average Outstanding in Period	42,222fmb_SecuritiesSoldUnderAgreementsToRepurchaseAverageOutstandingAmountInPeriod / us-gaap_CashAndCashEquivalentsAxis = fmb_DailySecuritiesMember	38,859fmb_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	17,469us-gaap_SecuritiesSoldUnderAgreementsToRepurchase / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember	17,253us-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	17,469fmb_SecuritiesSoldUnderAgreementsToRepurchaseMaximumMonthlyOutstandingAmount / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember	17,291fmb_SecuritiesSoldUnderAgreementsToRepurchaseMaximumMonthlyOutstandingAmount / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember
Approximate Average Outstanding in Period	$ 17,337fmb_SecuritiesSoldUnderAgreementsToRepurchaseAverageOutstandingAmountInPeriod / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember	$ 17,095fmb_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

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- Definition

Securities Sold Under Agreements To Repurchase Maximum Monthly Outstanding Amount

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Securities Sold Under Agreements To Repurchase Weighted Average Interest Rate

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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

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