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Loans (Narrative) (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross, Carrying Amount, Covered     $ 312,659,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
Loans and Leases Receivable, Gross, Commercial 9,222,609,000us-gaap_LoansAndLeasesReceivableCommercial 8,987,337,000us-gaap_LoansAndLeasesReceivableCommercial 9,128,591,000us-gaap_LoansAndLeasesReceivableCommercial
Time period for non-payment of loans that are placed on non-accrual status 90 days    
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums 4,600,000us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums 7,100,000us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums 5,400,000us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums
Days past due for nonaccrual status credit card loans 120 days    
Acquired Impaired Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Net reclassifications from nonaccretable to accretable 12,995,000us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsFromNonaccretableDifference
/ fmer_FinancingReceivableByLoanPortfolioStatusAxis
= fmer_AcquiredImpairedLoansMember
19,514,000us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsFromNonaccretableDifference
/ fmer_FinancingReceivableByLoanPortfolioStatusAxis
= fmer_AcquiredImpairedLoansMember
 
Covered impaired loan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross, Carrying Amount, Covered 404,400,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
/ fmer_FinancingReceivableByLoanPortfolioStatusAxis
= fmer_CoveredimpairedloanMember
702,400,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
/ fmer_FinancingReceivableByLoanPortfolioStatusAxis
= fmer_CoveredimpairedloanMember
 
Non-Covered Impaired Loan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross, Commercial 5,000,000us-gaap_LoansAndLeasesReceivableCommercial
/ fmer_FinancingReceivableByLoanPortfolioStatusAxis
= fmer_NonCoveredImpairedLoanMember
   
Acquired Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross, Commercial 1,011,170,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fmer_AcquiredLoansMember
1,562,878,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fmer_AcquiredLoansMember
1,086,899,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fmer_AcquiredLoansMember
Non-Single Family Loss Share Agreement | Covered impaired loan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross, Commercial 174,600,000us-gaap_LoansAndLeasesReceivableCommercial
/ fmer_FinancingReceivableByLoanPortfolioStatusAxis
= fmer_CoveredimpairedloanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fmer_NonSingleFamilyLossShareAgreementMember
   
Single Family Loss Share Agreement | Covered impaired loan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross, Consumer 110,400,000us-gaap_LoansAndLeasesReceivableConsumer
/ fmer_FinancingReceivableByLoanPortfolioStatusAxis
= fmer_CoveredimpairedloanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fmer_SingleFamilyLossShareAgreementMember
   
Covered impaired loan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Net reclassifications from nonaccretable to accretable (56,000)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsFromNonaccretableDifference
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fmer_CoveredimpairedloanMember
6,057,000us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsFromNonaccretableDifference
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fmer_CoveredimpairedloanMember
 
Impaired loans | Acquired Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance $ 548,200,000us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fmer_ImpairedloansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fmer_AcquiredLoansMember
$ 774,500,000us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fmer_ImpairedloansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fmer_AcquiredLoansMember