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Capital and Regulatory Matters (Details)
Dec. 31, 2015
Dec. 31, 2014
Capital and Regulatory Matters    
Common Equity Tier 1 required for capital adequacy purposes, ratio (as a percent) 4.50%  
Tier 1 required for capital adequacy purposes, ratio (as a percent) 6.00% 4.00%
Total capital required for capital adequacy purposes, ratio (as a percent) 8.00% 8.00%
Leverage required for capital adequacy purposes, ratio (as a percent) 4.00% 4.00%
Conservation Buffer Rule Starting January 2016    
Capital and Regulatory Matters    
Capital conservation buffer (as a percent) 0.625%  
Conservation Buffer Rule Subsequent to 2016    
Capital and Regulatory Matters    
Capital conservation buffer annual increase (as a percent) 0.625%  
Basel III New Capital Rules    
Capital and Regulatory Matters    
Tier 1 required for capital adequacy purposes, ratio (as a percent) 6.00%  
Prior to Basel III New Capital Rules    
Capital and Regulatory Matters    
Tier 1 required for capital adequacy purposes, ratio (as a percent) 4.00%  
Maximum | Conservation Buffer Rule    
Capital and Regulatory Matters    
Capital conservation buffer (as a percent) 2.50%