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Capital Resources (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Aug. 31, 2008
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2012
Dec. 31, 2010
Shareholders' Equity Disclosure [Line Items]            
Capital conservation buffer   2.50%        
Minimum Common Equity Tier 1 ratio   7.00%        
Minimum Tier 1 Risk-Based Capital ratio   8.50%        
Minimum Total Capital ratio   10.50%        
Capital conservation buffer future yearly increase, percentage   0.625%        
Dividends available for distribution   $ 69,669        
Stock repurchased during period, shares   15,381 656 327    
Stock repurchased during period, value   $ 497 $ 24 $ 8    
Stock Repurchase Plan [Member]            
Shareholders' Equity Disclosure [Line Items]            
Number of shares approved for repurchase 450,000          
Stock repurchase program, percentage 10.20%          
Stock repurchase program, authorized durational period 24 months          
Stock repurchase program, authorized additional durational period       24 months 24 months 24 months
Stock repurchased during period, shares   173,794 158,413      
Stock repurchased during period, value   $ 3,465 $ 2,968      
Treasury stock acquired, average cost per share   $ 19.94 $ 18.74      
Stock Repurchase Plan Current Year Repurchases [Member]            
Shareholders' Equity Disclosure [Line Items]            
Stock repurchased during period, shares   15,381 656      
Stock repurchased during period, value   $ 497        
Treasury stock acquired, average cost per share   $ 32.30