Derivative and Hedged Item (Details) (Net Interest, Designated as Hedging Instrument, USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Net Interest | Designated as Hedging Instrument
   
Derivative Instruments Gain Loss [Line Items]    
Gain (loss) on swap $ 238 $ (377)
Gain (loss) on borrowing (224) 328
Hedge ineffectiveness $ 14 $ (49)