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Borrowed Funds (Wholesale Borrowings and Long-term Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Total borrowed funds $ 1,272,591us-gaap_FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase $ 851,535us-gaap_FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase
FHLB advances    
Debt Instrument [Line Items]    
Federal Home Loan Bank Advances 427,857us-gaap_FederalHomeLoanBankAdvances
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
200,323us-gaap_FederalHomeLoanBankAdvances
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
Wholesale Borrowings    
Debt Instrument [Line Items]    
Federal Home Loan Bank Advances 214us-gaap_FederalHomeLoanBankAdvances
/ us-gaap_LongtermDebtTypeAxis
= fmer_OtherWholesaleBorrowingsMember
277us-gaap_FederalHomeLoanBankAdvances
/ us-gaap_LongtermDebtTypeAxis
= fmer_OtherWholesaleBorrowingsMember
Subordinated debentures 505,192us-gaap_SubordinatedDebt
/ us-gaap_LongtermDebtTypeAxis
= fmer_OtherWholesaleBorrowingsMember
249,928us-gaap_SubordinatedDebt
/ us-gaap_LongtermDebtTypeAxis
= fmer_OtherWholesaleBorrowingsMember
Other 0us-gaap_JuniorSubordinatedNotes
/ us-gaap_LongtermDebtTypeAxis
= fmer_OtherWholesaleBorrowingsMember
74,500us-gaap_JuniorSubordinatedNotes
/ us-gaap_LongtermDebtTypeAxis
= fmer_OtherWholesaleBorrowingsMember
Total borrowed funds $ 933,263us-gaap_FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_LongtermDebtTypeAxis
= fmer_OtherWholesaleBorrowingsMember
$ 525,028us-gaap_FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_LongtermDebtTypeAxis
= fmer_OtherWholesaleBorrowingsMember