Mortgage Banking Activities (Schedule of Serving Assets at Fair Value) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Servicing Asset at Fair Value, Amount [Roll Forward]      
Balance at beginning of year $ 2,232 $ 1,308  
Additions 685 1,166  
Amortization (669) (399) (134)
Change in valuation allowance   157  
Balances at end of year $ 2,248 $ 2,232 $ 1,308