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Regulatory Capital - Narrative (Details)
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Jan. 01, 2015
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]        
Capital conservation buffer, excess of minimum capital ratio       2.50%
Capital conservation buffer to risk weighted assets, year one 0.625%      
Capital conservation buffer to risk weighted assets, year two 1.25%      
Capital conservation buffer to risk weighted assets, year three 1.875%      
Capital conservation buffer to risk weighted assets, year four and thereafter 2.50%      
Common equity Tier 1 (to risk weighted assets), for capital adequacy purposes ratio 4.50% 7.00% 4.50%  
Tier 1 capital (to risk weighted assets), for capital adequacy purposes ratio 6.00% 8.50% 6.00%  
Total capital (to risk weighted assets), for capital adequacy purposes ratio 8.00% 10.50% 8.00%  
Customers Bank        
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]        
Common equity Tier 1 (to risk weighted assets), for capital adequacy purposes ratio 4.50%   4.50%  
Tier 1 capital (to risk weighted assets), for capital adequacy purposes ratio 6.00%   6.00%  
Total capital (to risk weighted assets), for capital adequacy purposes ratio 8.00%   8.00%