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Business Combinations (Acquired Impaired Loans Fair Value at Acquisition Date) (Details) (Citizens Republic Bancorp, USD $)
In Thousands, unless otherwise specified
 0 Months Ended
Apr. 12, 2013
Fair Value Adjustment for Acquired Non-Impaired Loans [Line Items]  
Fair value of acquired nonimpaired loans $ 4,617,004us-gaap_BusinessCombinationAcquiredReceivablesFairValue
Acquired performing loans  
Fair Value Adjustment for Acquired Non-Impaired Loans [Line Items]  
Outstanding balance 4,017,304fmer_ReceivablesCarryingValueatAcquisitionDate
/ us-gaap_BusinessAcquisitionAxis
= fmer_CitizensRepublicBancorpMember
/ fmer_FinancingReceivableByLoanPortfolioStatusAxis
= fmer_AcquiredperformingloansMember
Less: Fair value adjustment 220,015us-gaap_GoodwillPurchaseAccountingAdjustments
/ us-gaap_BusinessAcquisitionAxis
= fmer_CitizensRepublicBancorpMember
/ fmer_FinancingReceivableByLoanPortfolioStatusAxis
= fmer_AcquiredperformingloansMember
Fair value of acquired nonimpaired loans $ 3,797,289us-gaap_BusinessCombinationAcquiredReceivablesFairValue
/ us-gaap_BusinessAcquisitionAxis
= fmer_CitizensRepublicBancorpMember
/ fmer_FinancingReceivableByLoanPortfolioStatusAxis
= fmer_AcquiredperformingloansMember