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Commitments and Contingencies (Schedule of Commitments to Extend Credit) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Loan Commitments $ 6,034,870fmer_LoanCommitments $ 6,136,313fmer_LoanCommitments $ 5,632,201fmer_LoanCommitments
Commercial Loan      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Loan Commitments 3,691,193fmer_LoanCommitments
/ fmer_CommitmentsByTypeAxis
= us-gaap_CommercialLoanMember		 3,748,690fmer_LoanCommitments
/ fmer_CommitmentsByTypeAxis
= us-gaap_CommercialLoanMember		 3,394,877fmer_LoanCommitments
/ fmer_CommitmentsByTypeAxis
= us-gaap_CommercialLoanMember
Total consumer      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Loan Commitments $ 2,343,677fmer_LoanCommitments
/ fmer_CommitmentsByTypeAxis
= us-gaap_ConsumerLoanMember		 $ 2,387,623fmer_LoanCommitments
/ fmer_CommitmentsByTypeAxis
= us-gaap_ConsumerLoanMember		 $ 2,237,324fmer_LoanCommitments
/ fmer_CommitmentsByTypeAxis
= us-gaap_ConsumerLoanMember