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Fair Value Of Assets And Liabilities (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
number
Dec. 31, 2013
Dec. 31, 2012
Fair Value Of Assets And Liabilities [Abstract]      
Gain/(loss) on instrument specific credit risk $ 2,800,000us-gaap_FairValueOptionCreditRiskGainsLossesOnAssets $ (1,500,000)us-gaap_FairValueOptionCreditRiskGainsLossesOnAssets $ (1,800,000)us-gaap_FairValueOptionCreditRiskGainsLossesOnAssets
Number of levels assets and liabilities are grouped in 3fhn_NumberOfLevelsAssetsAndLiabilitiesAreGroupedIn    
Goodwill, Impairment $ 0us-gaap_GoodwillImpairmentLoss $ 0us-gaap_GoodwillImpairmentLoss $ 0us-gaap_GoodwillImpairmentLoss