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Regulatory Capital - Summary of Capital Amounts, Tier 1 Risk Based and Tier 1 Leveraged Ratios (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Common equity Tier 1 (to risk-weighted-assets), actual amount | $ 821,810 | $ 745,795
Tier 1 capital (to risk-weighted assets), actual amount | 1,039,281 | 963,266
Total capital (to risk-weighted assets), actual amount | 1,256,309 | 1,081,962
Tier 1 capital (to average assets), actual amount | $ 1,039,281 | $ 963,266
Common equity Tier 1 (to risk-weighted assets), actual ratio | 7.984% | 8.964%
Tier 1 capital (to risk-weighted assets), actual ratio | 10.096% | 11.578%
Total capital (to risk-weighted assets), actual ratio | 12.205% | 13.005%
Tier 1 capital (to average assets), actual ratio | 9.258% | 9.665%
Common equity Tier 1 (to risk-weighted assets), for capital adequacy purposes amount | $ 463,211 | $ 374,388
Tier 1 capital (to risk-weighted assets), for capital adequacy purposes amount | 617,615 | 499,185
Total capital (to risk-weighted assets), for capital adequacy purposes amount | 823,487 | 655,580
Tier 1 capital (to average assets), for capital adequacy purposes amount | $ 449,026 | $ 398,668
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%
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 | $ 720,551 | $ 530,384
Tier 1 (to risk-weighted assets), for Basel III amount | 874,955 | 655,180
Total capital (to risk-weighted assets), for Basel III amount | 1,080,827 | 821,575
Tier 1 capital (to average assets) for Basel III amount | $ 449,026 | $ 398,668
Common equity Tier 1 (to risk-weighted assets), for Basel III ratio | 7.00% | 6.375%
Tier 1 capital (to risk-weighted assets), for Basel III ratio | 8.50% | 7.875%
Total capital (to risk-weighted assets), for Basel III ratio | 10.50% | 9.875%
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 | $ 1,164,652 | $ 1,066,121
Tier 1 capital (to risk-weighted assets), actual amount | 1,164,652 | 1,066,121
Total capital (to risk-weighted assets), actual amount | 1,330,155 | 1,215,522
Tier 1 capital (to average assets), actual amount | $ 1,164,652 | $ 1,066,121
Common equity Tier 1 (to risk-weighted assets), actual ratio | 11.323% | 12.822%
Tier 1 capital (to risk-weighted assets), actual ratio | 11.323% | 12.822%
Total capital (to risk-weighted assets), actual ratio | 12.933% | 14.619%
Tier 1 capital (to average assets), actual ratio | 10.379% | 10.699%
Common equity Tier 1 (to risk-weighted assets), for capital adequacy purposes amount | $ 462,842 | $ 374,160
Tier 1 capital (to risk-weighted assets), for capital adequacy purposes amount | 617,122 | 498,879
Total capital (to risk-weighted assets), for capital adequacy purposes amount | 822,829 | 665,173
Tier 1 capital (to average assets), for capital adequacy purposes amount | $ 448,851 | $ 398,570
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%
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 | $ 668,549 | $ 540,453
Tier 1 capital (to risk-weighted assets), to be well capitalized under prompt corrective action provisions amount | 822,829 | 665,173
Total capital (to risk-weighted assets), to be well capitalized under prompt corrective action provisions amount | 1,028,537 | 831,466
Tier 1 capital (to average assets), to be well capitalized under prompt corrective action provisions amount | $ 561,064 | $ 498,212
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 | $ 719,976 | $ 530,059
Tier 1 (to risk-weighted assets), for Basel III amount | 874,256 | 654,779
Total capital (to risk-weighted assets), for Basel III amount | 1,079,964 | 821,072
Tier 1 capital (to average assets) for Basel III amount | $ 448,851 | $ 398,570
Common equity Tier 1 (to risk-weighted assets), for Basel III ratio | 7.00% | 6.375%
Tier 1 capital (to risk-weighted assets), for Basel III ratio | 8.50% | 7.875%
Total capital (to risk-weighted assets), for Basel III ratio | 10.50% | 9.875%
Tier 1 capital (to average assets), for Basel III ratio | 4.00% | 4.00%

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Name: | dei_LegalEntityAxis=cubi_CustomersBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |