Goodwill and Other Intangible Assets (Changes in Core Deposit Intangible and Trust Relationship Intangible) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Core Deposits [Member]      
Finite Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross $ 17,300 $ 17,300 $ 17,300
Finite-Lived Intangible Assets, Accumulated Amortization (14,161) (13,088) (12,014)
Finite-Lived Intangible Assets, Net 3,139 4,212 5,286
Finite-lived Intangible Assets Acquired 0 0  
Amortization (1,073) (1,074)  
Netbook Value Of Acquired Intangible Assets (1,073) (1,074)  
Trust Relationship [Member]      
Finite Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross 753 753 753
Finite-Lived Intangible Assets, Accumulated Amortization (527) (452) (376)
Finite-Lived Intangible Assets, Net 226 301 377
Finite-lived Intangible Assets Acquired 0 0  
Amortization (75) (76)  
Netbook Value Of Acquired Intangible Assets $ (75) $ (76)