Derivatives (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Derivative Instruments and Hedging Activities Disclosure [Abstract]      
Swap fee income $ 1,847,000 $ 430,000 $ 0
Collateral posted against derivative liabilities $ 4,600,000 $ 300,000