Regulatory Matters (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Customers Bancorp, Inc. [Member]
Summary of capital amounts and ratios
Total capital to risk weighted assets, Actual Amount	$ 171,153	$ 162,228
Total capital to risk weighted assets, Actual Ratio	10.17%	11.43%
Total capital to risk weighted assets, For Capital Adequacy Purposes Amount	134,597	113,504
Total capital to risk weighted assets, for Capital Adequacy Purposes Ratio	8.00%	8.00%
Tier 1 capital to risk weighted assets, Actual Amount	154,182	146,395
Tier 1 capital to risk weighted assets, Actual Ratio	9.16%	10.32%
Tier 1 capital to risk weighted assets, For Capital Adequacy Purposes Amount	67,299	56,752
Tier 1 capital to risk weighted assets, For Capital Adequacy Purposes Ratio	4.00%	4.00%
Tier 1 capital to average assets, Actual Amount	154,182	146,395
Tier 1 capital to average assets, Actual Ratio	7.45%	7.59%
Tier 1 capital to average assets, For Capital Adequacy Purposes Amount	82,733	77,166
Tier 1 capital to average assets, For Capital Adequacy Purposes Ratio	4.00%	4.00%
Customers Bank [Member]
Summary of capital amounts and ratios
Total capital to risk weighted assets, Actual Amount	170,807	157,228
Total capital to risk weighted assets, Actual Ratio	10.16%	11.08%
Total capital to risk weighted assets, For Capital Adequacy Purposes Amount	134,524	113,504
Total capital to risk weighted assets, for Capital Adequacy Purposes Ratio	8.00%	8.00%
Total capital to risk weighted assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	168,155	141,880
Total capital to risk weighted assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	10.00%	10.00%
Tier 1 capital to risk weighted assets, Actual Amount	153,836	141,395
Tier 1 capital to risk weighted assets, Actual Ratio	9.15%	9.97%
Tier 1 capital to risk weighted assets, For Capital Adequacy Purposes Amount	67,262	56,752
Tier 1 capital to risk weighted assets, For Capital Adequacy Purposes Ratio	4.00%	4.00%
Tier 1 capital to risk weighted assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	100,893	85,128
Tier 1 capital to risk weighted assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	6.00%	6.00%
Tier 1 capital to average assets, Actual Amount	153,836	141,395
Tier 1 capital to average assets, Actual Ratio	7.43%	7.33%
Tier 1 capital to average assets, For Capital Adequacy Purposes Amount	82,788	77,166
Tier 1 capital to average assets, For Capital Adequacy Purposes Ratio	4.00%	4.00%
Tier 1 capital to average assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 103,485	$ 96,457
Tier 1 capital to average assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	5.00%	5.00%