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Regulatory Matters - Summary of Capital Amounts, Tier 1 Risk Based and Tier 1 Leveraged Ratios (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Jan. 01, 2017
Dec. 31, 2016
Jan. 01, 2016
Customers Bancorp, Inc.        
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]        
Common equity Tier 1 (to risk-weighted-assets), actual amount $ 689,494   $ 628,139  
Tier 1 capital (to risk-weighted assets), actual amount 906,963   844,755  
Total capital (to risk-weighted assets), actual amount 1,021,601   966,097  
Tier 1 capital (to average assets), actual amount $ 906,963   $ 844,755  
Common equity Tier 1 (to risk-weighted assets), actual ratio 8.805%   8.487%  
Tier 1 capital (to risk-weighted assets), actual ratio 11.583%   11.414%  
Total capital (to risk-weighted assets), actual ratio 13.047%   13.053%  
Tier 1 capital (to average assets), actual ratio 8.937%   9.067%  
Common equity Tier 1 (to risk-weighted assets), for capital adequacy purposes amount $ 352,368   $ 333,049  
Tier 1 capital (to risk-weighted assets), for capital adequacy purposes amount 469,824   444,065  
Total capital (to risk-weighted assets), for capital adequacy purposes amount 626,432   592,087  
Tier 1 capital (to average assets), for capital adequacy purposes amount $ 405,949   $ 372,652  
Common equity Tier 1 (to risk-weighted assets), for capital adequacy purposes ratio 4.50% 5.75% 4.50%  
Tier 1 capital (to risk-weighted assets), for capital adequacy purposes ratio 6.00% 7.25% 6.00%  
Total capital (to risk-weighted assets), for capital adequacy purposes ratio 8.00% 9.25% 8.00%  
Tier 1 capital (to average assets), for capital adequacy purposes ratio 4.00%   4.00%  
Common equity Tier 1 (to risk-weighted assets), for Basel III amount $ 450,248   $ 379,306  
Tier 1 (to risk-weighted assets), for Basel III amount 567,704   490,322  
Total capital (to risk-weighted assets), for Basel III amount 724,313   638,343  
Tier 1 capital (to average assets) for Basel III amount $ 405,949   $ 372,652  
Common equity Tier 1 (to risk-weighted assets), for Basel III ratio 5.75%   5.125%  
Tier 1 capital (to risk-weighted assets), for Basel III ratio 7.25%   6.625%  
Total capital (to risk-weighted assets), for Basel III ratio 9.25%   8.625%  
Tier 1 capital (to average assets), for Basel III ratio 4.00%   4.00%  
Customers Bank        
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]        
Common equity Tier 1 (to risk-weighted-assets), actual amount $ 1,023,564   $ 857,421  
Tier 1 capital (to risk-weighted assets), actual amount 1,023,564   857,421  
Total capital (to risk-weighted assets), actual amount 1,170,666   1,003,609  
Tier 1 capital (to average assets), actual amount $ 1,023,564   $ 857,421  
Common equity Tier 1 (to risk-weighted assets), actual ratio 13.081%   11.626%  
Tier 1 capital (to risk-weighted assets), actual ratio 13.081%   11.626%  
Total capital (to risk-weighted assets), actual ratio 14.961%   13.608%  
Tier 1 capital (to average assets), actual ratio 10.092%   9.233%  
Common equity Tier 1 (to risk-weighted assets), for capital adequacy purposes amount $ 352,122   $ 331,879  
Tier 1 capital (to risk-weighted assets), for capital adequacy purposes amount 469,496   442,505  
Total capital (to risk-weighted assets), for capital adequacy purposes amount 625,994   590,006  
Tier 1 capital (to average assets), for capital adequacy purposes amount $ 405,701   $ 371,466  
Common equity Tier 1 (to risk-weighted assets), for capital adequacy purposes ratio 4.50%   4.50% 5.125%
Tier 1 capital (to risk-weighted assets), for capital adequacy purposes ratio 6.00%   6.00% 6.625%
Total capital (to risk-weighted assets), for capital adequacy purposes ratio 8.00%   8.00% 8.625%
Tier 1 capital (to average assets), for capital adequacy purposes ratio 4.00%   4.00%  
Common equity Tier 1 (to risk-weighted assets), to be well capitalized under prompt correction action provisions amount $ 508,621   $ 479,380  
Tier 1 capital (to risk-weighted assets), to be well capitalized under prompt corrective action provisions amount 625,994   590,006  
Total capital (to risk-weighted assets), to be well capitalized under prompt corrective action provisions amount 782,493   737,508  
Tier 1 capital (to average assets), to be well capitalized under prompt corrective action provisions amount $ 507,126   $ 464,333  
Common equity Tier 1 (to risk-weighted assets), to be well capitalized under prompt corrective action provisions ratio 6.50%   6.50%  
Tier 1 capital (to risk-weighted assets), to be well capitalized under prompt corrective action provisions ratio 8.00%   8.00%  
Total capital (to risk-weighted assets), to be well capitalized under prompt corrective action provisions ratio 10.00%   10.00%  
Tier 1 capital (to average assets), to be well capitalized under prompt corrective action provisions ratio 5.00%   5.00%  
Common equity Tier 1 (to risk-weighted assets), for Basel III amount $ 449,934   $ 377,973  
Tier 1 (to risk-weighted assets), for Basel III amount 567,307   488,599  
Total capital (to risk-weighted assets), for Basel III amount 723,806   636,101  
Tier 1 capital (to average assets) for Basel III amount $ 405,701   $ 371,466  
Common equity Tier 1 (to risk-weighted assets), for Basel III ratio 5.75%   5.125%  
Tier 1 capital (to risk-weighted assets), for Basel III ratio 7.25%   6.625%  
Total capital (to risk-weighted assets), for Basel III ratio 9.25%   8.625%  
Tier 1 capital (to average assets), for Basel III ratio 4.00%   4.00%