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Commitments and Contingencies (Schedule of Guarantor Obligations) (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Guarantor Obligations [Line Items]      
Guarantor Obligations, Short-Term   $ 199,800,000fmer_GuarantorObligationsShortTerm  
Guarantor Obligations, Current Carrying Value 315,732,000us-gaap_GuaranteeObligationsCurrentCarryingValue 287,461,000us-gaap_GuaranteeObligationsCurrentCarryingValue 232,190,000us-gaap_GuaranteeObligationsCurrentCarryingValue
Standby Letters of Credit      
Guarantor Obligations [Line Items]      
Guarantor Obligations, Current Carrying Value 275,736,000us-gaap_GuaranteeObligationsCurrentCarryingValue
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_StandbyLettersOfCreditMember		 242,390,000us-gaap_GuaranteeObligationsCurrentCarryingValue
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_StandbyLettersOfCreditMember		 194,118,000us-gaap_GuaranteeObligationsCurrentCarryingValue
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_StandbyLettersOfCreditMember
Loans Sold with Recourse      
Guarantor Obligations [Line Items]      
Guarantor Obligations, Current Carrying Value $ 39,996,000us-gaap_GuaranteeObligationsCurrentCarryingValue
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_GuaranteeTypeOtherMember		 $ 45,071,000us-gaap_GuaranteeObligationsCurrentCarryingValue
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_GuaranteeTypeOtherMember		 $ 38,072,000us-gaap_GuaranteeObligationsCurrentCarryingValue
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_GuaranteeTypeOtherMember