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Capital Ratios (Details) - USD ($)
 9 Months Ended
Jan. 01, 2015
Sep. 30, 2015
Jan. 01, 2016
Dec. 31, 2014
Jul. 31, 2013
CET 1 ratio   16.06%      
Tier 1 capital (to Average Assets), Actual Ratio (as a percent)   12.80%   12.33%  
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent)   17.91%   19.34% 6.00%
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 4.50% 18.72%   20.24%  
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 2.50%        
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   $ 161,416,000   $ 175,416,000  
Minimum          
CET 1 ratio   7.00%      
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent)         4.00%
Forecast          
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)     0.625%