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Loans (Changes in the carrying amount and accretable yield for acquired impaired loans) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Apr. 12, 2013
Acquired Impaired Loans        
Changes in the carrying amount and accretable yield for acquired impaired loans [Line Items]        
Certain Loans Acquired in Transfer, Accretable Yield $ 119,450us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield
/ fmer_FinancingReceivableByLoanPortfolioStatusAxis
= fmer_AcquiredImpairedLoansMember
$ 136,646us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield
/ fmer_FinancingReceivableByLoanPortfolioStatusAxis
= fmer_AcquiredImpairedLoansMember
$ 0us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield
/ fmer_FinancingReceivableByLoanPortfolioStatusAxis
= fmer_AcquiredImpairedLoansMember
 
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 423,209us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet
/ fmer_FinancingReceivableByLoanPortfolioStatusAxis
= fmer_AcquiredImpairedLoansMember
601,000us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet
/ fmer_FinancingReceivableByLoanPortfolioStatusAxis
= fmer_AcquiredImpairedLoansMember
0us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet
/ fmer_FinancingReceivableByLoanPortfolioStatusAxis
= fmer_AcquiredImpairedLoansMember
 
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion (49,271)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion
/ fmer_FinancingReceivableByLoanPortfolioStatusAxis
= fmer_AcquiredImpairedLoansMember
(27,144)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion
/ fmer_FinancingReceivableByLoanPortfolioStatusAxis
= fmer_AcquiredImpairedLoansMember
   
Certain Loans Acquired in Transfer not Accounted for as Debt Securities Carrying Amount Accretion 49,271fmer_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountAccretion
/ fmer_FinancingReceivableByLoanPortfolioStatusAxis
= fmer_AcquiredImpairedLoansMember
27,144fmer_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountAccretion
/ fmer_FinancingReceivableByLoanPortfolioStatusAxis
= fmer_AcquiredImpairedLoansMember
   
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference 45,824us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsFromNonaccretableDifference
/ fmer_FinancingReceivableByLoanPortfolioStatusAxis
= fmer_AcquiredImpairedLoansMember
46,361us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsFromNonaccretableDifference
/ fmer_FinancingReceivableByLoanPortfolioStatusAxis
= fmer_AcquiredImpairedLoansMember
   
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities F D I C Payments Received under Loss Sharing Agreement (227,062)fmer_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesFDICPaymentsReceivedUnderLossSharingAgreement
/ fmer_FinancingReceivableByLoanPortfolioStatusAxis
= fmer_AcquiredImpairedLoansMember
(245,859)fmer_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesFDICPaymentsReceivedUnderLossSharingAgreement
/ fmer_FinancingReceivableByLoanPortfolioStatusAxis
= fmer_AcquiredImpairedLoansMember
   
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Disposals of Loans (13,749)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldDisposalsOfLoans
/ fmer_FinancingReceivableByLoanPortfolioStatusAxis
= fmer_AcquiredImpairedLoansMember
(14,129)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldDisposalsOfLoans
/ fmer_FinancingReceivableByLoanPortfolioStatusAxis
= fmer_AcquiredImpairedLoansMember
   
Acquired Impaired Loans | Citizens Republic Bancorp        
Changes in the carrying amount and accretable yield for acquired impaired loans [Line Items]        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance       1,231,172us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance
/ us-gaap_BusinessAcquisitionAxis
= fmer_CitizensRepublicBancorpMember
/ fmer_FinancingReceivableByLoanPortfolioStatusAxis
= fmer_AcquiredImpairedLoansMember
Certain Loans Acquired in Transfer, Accretable Yield 0us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield
/ us-gaap_BusinessAcquisitionAxis
= fmer_CitizensRepublicBancorpMember
/ fmer_FinancingReceivableByLoanPortfolioStatusAxis
= fmer_AcquiredImpairedLoansMember
    131,558us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield
/ us-gaap_BusinessAcquisitionAxis
= fmer_CitizensRepublicBancorpMember
/ fmer_FinancingReceivableByLoanPortfolioStatusAxis
= fmer_AcquiredImpairedLoansMember
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 0us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_BusinessAcquisitionAxis
= fmer_CitizensRepublicBancorpMember
/ fmer_FinancingReceivableByLoanPortfolioStatusAxis
= fmer_AcquiredImpairedLoansMember
    819,715us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_BusinessAcquisitionAxis
= fmer_CitizensRepublicBancorpMember
/ fmer_FinancingReceivableByLoanPortfolioStatusAxis
= fmer_AcquiredImpairedLoansMember
Impaired loans | Acquired Loans        
Changes in the carrying amount and accretable yield for acquired impaired loans [Line Items]        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance $ 590,900us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fmer_ImpairedloansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fmer_AcquiredLoansMember
$ 817,600us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fmer_ImpairedloansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fmer_AcquiredLoansMember