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Capital Requirements (Changes) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Jan. 01, 2016
Jul. 31, 2013
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent)       6.00%
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)   2.50% 0.625%  
Term of mandatory compliance   4 years    
Percentage of capital securities issued by trust qualifying as Tier I capital, maximum 25.00%      
Percentage of capital securities issued by trust qualifying as Tier II capital, minimum 25.00%      
Capital securities issued by the trust, qualifying as Tier I capital $ 160,416,000 $ 161,416,000    
Minimum        
CET 1 ratio 7.00%      
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent)       4.00%
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent)   4.50%    
Parent Company        
Tier 1 capital (to Average Assets), Actual Ratio (as a percent) 13.91% 13.15%    
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent) 18.68% 18.69%    
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 19.47% 19.54%    
Parent Company | Minimum        
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 8.625% 8.00%