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Condensed Financial Statements of Parent Company - Summary of Condensed Statements of Cash Flows of Parent Company (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash Flows from Operating Activities: |  |  |  |  |  |  |  |  |  |  |
Net income | $ 56,245 | $ 50,515 | $ 22,718 | $ 3,100 | $ 27,526 | $ 27,066 | $ 9,296 | $ 15,440 | $ 132,578 | $ 79,327 | $ 71,695
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |  |  |  |  |  |  |  |  |
(Increase) decrease in other assets |  |  |  |  |  |  |  |  | (95,833) | (84,141) | (34,614)
Increase (decrease) in other liabilities |  |  |  |  |  |  |  |  | 38,461 | 15,002 | 9,881
Net Cash Provided by (Used in) Operating Activities |  |  |  |  |  |  |  |  | 133,025 | 78,280 | 97,474
Cash Flows from Investing Activities |  |  |  |  |  |  |  |  |  |  |
Net Cash Provided By (Used in) Investing Activities |  |  |  |  |  |  |  |  | (6,424,969) | (1,444,435) | (104,098)
Cash Flows from Financing Activities |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  | 923 | 2,150 | 3,585
Proceeds from issuance of subordinated long-term debt |  |  |  |  |  |  |  |  | 0 | 72,030 | 0
Proceed from issuance of other long-term borrowings |  |  |  |  |  |  |  |  | 0 | 24,477 | 0
Repayments of other borrowings |  |  |  |  |  |  |  |  | 0 | (25,000) | (63,250)
Exercise and redemption of warrants |  |  |  |  |  |  |  |  | 0 | 0 | 112
Purchase of treasury stock |  |  |  |  |  |  |  |  | 0 | (571) | (12,976)
Payments of employee taxes withheld from share-based awards |  |  |  |  |  |  |  |  | (2,063) | (1,732) | (880)
Preferred stock dividends paid |  |  |  |  |  |  |  |  | (14,076) | (14,459) | (14,459)
Net Cash Provided by (Used in) Financing Activities |  |  |  |  |  |  |  |  | 6,772,793 | 1,516,525 | (77,564)
Net Increase (Decrease) in Cash and Cash Equivalents |  |  |  |  |  |  |  |  | 480,849 | 150,370 | (84,188)
Cash and Cash Equivalents – Beginning |  |  |  | 212,505 |  |  |  | 62,135 | 212,505 | 62,135 | 146,323
Cash and Cash Equivalents – Ending | 693,354 |  |  |  | 212,505 |  |  |  | 693,354 | 212,505 | 62,135
Customers Bancorp |  |  |  |  |  |  |  |  |  |  |
Cash Flows from Operating Activities: |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 132,578 | 79,327 | 71,695
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed earnings of subsidiaries, net of dividends received from Bank |  |  |  |  |  |  |  |  | (76,054) | (14,105) | (33,838)
(Increase) decrease in other assets |  |  |  |  |  |  |  |  | 5,613 | (3,166) | (256)
Increase (decrease) in other liabilities |  |  |  |  |  |  |  |  | 1,088 | 1,775 | (251)
Net Cash Provided by (Used in) Operating Activities |  |  |  |  |  |  |  |  | 63,225 | 63,831 | 37,350
Cash Flows from Investing Activities |  |  |  |  |  |  |  |  |  |  |
Payments for investments in and advances to subsidiaries |  |  |  |  |  |  |  |  | (26) | (74,767) | (29)
Net Cash Provided By (Used in) Investing Activities |  |  |  |  |  |  |  |  | (26) | (74,767) | (29)
Cash Flows from Financing Activities |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  | 923 | 2,150 | 3,585
Proceeds from issuance of subordinated long-term debt |  |  |  |  |  |  |  |  | 0 | 72,030 | 0
Proceed from issuance of other long-term borrowings |  |  |  |  |  |  |  |  | 0 | 24,477 | 0
Repayments of other borrowings |  |  |  |  |  |  |  |  | 0 | (25,000) | (63,250)
Exercise and redemption of warrants |  |  |  |  |  |  |  |  | 0 | 0 | 112
Purchase of treasury stock |  |  |  |  |  |  |  |  | 0 | (571) | (12,976)
Payments of employee taxes withheld from share-based awards |  |  |  |  |  |  |  |  | (2,063) | (1,732) | (880)
Preferred stock dividends paid |  |  |  |  |  |  |  |  | (14,076) | (14,459) | (14,459)
Net Cash Provided by (Used in) Financing Activities |  |  |  |  |  |  |  |  | (15,216) | 56,895 | (87,868)
Net Increase (Decrease) in Cash and Cash Equivalents |  |  |  |  |  |  |  |  | 47,983 | 45,959 | (50,547)
Cash and Cash Equivalents – Beginning |  |  |  | $ 62,643 |  |  |  | $ 16,684 | 62,643 | 16,684 | 67,231
Cash and Cash Equivalents – Ending | $ 110,626 |  |  |  | $ 62,643 |  |  |  | $ 110,626 | $ 62,643 | $ 16,684

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