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Investment Securities (Narrative) (Details Textual) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Schedule of Available-for-Sale and Held-to-Maturity Securities [Line Items]    
Available for sale securities, net unrealized losses $ (44,900,000)fmer_Availableforsalesecuritiesnetunrealizedlosses $ (167,400,000)fmer_Availableforsalesecuritiesnetunrealizedlosses
Unrealized Gain (Loss) on Investments (102,400,000)us-gaap_UnrealizedGainLossOnInvestments (208,400,000)us-gaap_UnrealizedGainLossOnInvestments
Number of Single Issuer Trust Preferred Securities With Stated Maturities 8fmer_NumberOfSingleIssuerTrustPreferredSecuritiesWithStatedMaturities  
Investment Securities    
Other investment securities pledged 2,800,000,000us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged 3,200,000,000us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged
Number of states with aggregate fair value of general obligation bonds greater than $10 million 11fmer_Numberofstateswithaggregatefairvalueofgeneralobligationbondsgreaterthan10million  
Total number of states general obligation bonds are held 37fmer_Totalnumberofstatesgeneralobligationbondsareheld  
Maximum portfolio concentration in municipal securities per corporate investment policy 20.00%fmer_Maximumportfolioconcentrationinmunicipalsecuritiespercorporateinvestmentpolicy  
Amount of municipal securities with a combined individual state to total municipal outstanding equal to or less than, per corporate policy 25.00%fmer_Amountofmunicipalsecuritieswithacombinedindividualstatetototalmunicipaloutstandingequaltoorlessthanpercorporatepolicy  
Percent of trust preferred securities included in fair value of entire investment portfolio 1.00%fmer_Percentoftrustpreferredsecuritiesincludedinfairvalueofentireinvestmentportfolio  
Available-for-sale 3,545,288,000us-gaap_AvailableForSaleSecurities 3,273,174,000us-gaap_AvailableForSaleSecurities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 424,916,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue 1,908,543,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Available-for-sale Securities, Gross Unrealized Loss at End of Period 52,631,000fmer_AvailableforsaleSecuritiesGrossUnrealizedLossatEndofPeriod 90,220,000fmer_AvailableforsaleSecuritiesGrossUnrealizedLossatEndofPeriod
Collateralized Loan Obligations    
Investment Securities    
Available-for-sale 287,844,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedLoanObligationsMember
293,687,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedLoanObligationsMember
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 79,042,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedLoanObligationsMember
223,458,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedLoanObligationsMember
Available-for-sale Securities, Gross Unrealized Loss at End of Period 9,613,000fmer_AvailableforsaleSecuritiesGrossUnrealizedLossatEndofPeriod
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedLoanObligationsMember
4,332,000fmer_AvailableforsaleSecuritiesGrossUnrealizedLossatEndofPeriod
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedLoanObligationsMember
Corporate bonds    
Investment Securities    
Available-for-sale 51,337,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
50,644,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Available-for-sale Securities, Gross Unrealized Loss at End of Period 10,315,000fmer_AvailableforsaleSecuritiesGrossUnrealizedLossatEndofPeriod
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
10,952,000fmer_AvailableforsaleSecuritiesGrossUnrealizedLossatEndofPeriod
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
12 States    
Investment Securities    
General obligation bonds, fair value $ 10,000,000fmer_Generalobligationbondsaggregatefairvalue
/ fmer_A38StatesAxis
= fmer_A12statesMember