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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash Flows from Operating Activities: |  |  |  |  |  |  |  |  |  |  |
Net income | $ 17,862 | $ 6,029 | $ 23,663 | $ 24,142 | $ 21,615 | $ 7,754 | $ 23,722 | $ 25,747 | $ 71,695 | $ 78,837 | $ 78,702
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Loss (gain) on sale of investment securities |  | $ 18,659 |  |  |  |  |  |  | 18,659 | (8,800) | (25)
(Increase) decrease in other assets |  |  |  |  |  |  |  |  | (34,614) | (32,256) | (11,538)
(Decrease) increase in other liabilities |  |  |  |  |  |  |  |  | 9,881 | (16,687) | 5,819
Net Cash Provided by Operating Activities |  |  |  |  |  |  |  |  | 97,474 | 62,193 | 91,403
Cash Flows from Investing Activities: |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of investment securities available for sale |  |  |  |  |  |  |  |  | 476,182 | 769,203 | 2,852
Net Cash Used in Investing Activities |  |  |  |  |  |  |  |  | (104,098) | (565,125) | (961,534)
Cash Flows from Financing Activities: |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  | 3,585 | 2,716 | 70,985
Net proceeds from issuance of preferred stock |  |  |  |  |  |  |  |  | 0 | 0 | 161,902
(Repayments of) proceeds from issuance of long-term debt |  |  |  |  |  |  |  |  | 0 | 98,564 | 0
Exercise and redemption of warrants |  |  |  |  |  |  |  |  | 112 | 1,059 | 1,532
Purchase of treasury stock |  |  |  |  |  |  |  |  | (12,976) | 0 | 0
Preferred stock dividends paid |  |  |  |  |  |  |  |  | (14,459) | (14,459) | (9,051)
Net Cash (Used in) Provided by Financing Activities |  |  |  |  |  |  |  |  | (77,564) | 384,546 | 870,247
Net (Decrease) Increase in Cash and Cash Equivalents |  |  |  |  |  |  |  |  | (84,188) | (118,386) | 116
Cash and Cash Equivalents – Beginning |  |  |  | 146,323 |  |  |  | 264,709 | 146,323 | 264,709 | 264,593
Cash and Cash Equivalents – Ending | 62,135 |  |  |  | 146,323 |  |  |  | 62,135 | 146,323 | 264,709
Customers Bancorp |  |  |  |  |  |  |  |  |  |  |
Cash Flows from Operating Activities: |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 71,695 | 78,837 | 78,702
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed earnings of subsidiaries, net of dividends received from Bank |  |  |  |  |  |  |  |  | (33,838) | (46,743) | (59,765)
Loss (gain) on sale of investment securities |  |  |  |  |  |  |  |  | 0 | 0 | 1
(Increase) decrease in other assets |  |  |  |  |  |  |  |  | (256) | 7,624 | (7,721)
(Decrease) increase in other liabilities |  |  |  |  |  |  |  |  | (251) | (1,322) | 54
Net Cash Provided by Operating Activities |  |  |  |  |  |  |  |  | 37,350 | 38,396 | 11,271
Cash Flows from Investing Activities: |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of investment securities available for sale |  |  |  |  |  |  |  |  | 0 | 0 | 4
Payments for investments in and advances to subsidiaries |  |  |  |  |  |  |  |  | (29) | (98,725) | (230,872)
Net Cash Used in Investing Activities |  |  |  |  |  |  |  |  | (29) | (98,725) | (230,868)
Cash Flows from Financing Activities: |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  | 3,585 | 2,716 | 70,985
Net proceeds from issuance of preferred stock |  |  |  |  |  |  |  |  | 0 | 0 | 161,902
(Repayments of) proceeds from issuance of long-term debt |  |  |  |  |  |  |  |  | (63,250) | 98,564 | 0
Exercise and redemption of warrants |  |  |  |  |  |  |  |  | 112 | 1,059 | 1,532
Purchase of treasury stock |  |  |  |  |  |  |  |  | (12,976) | 0 | 0
Payments of employee taxes withheld from share-based awards |  |  |  |  |  |  |  |  | (880) | (14,761) | (5,897)
Preferred stock dividends paid |  |  |  |  |  |  |  |  | (14,459) | (14,459) | (9,051)
Net Cash (Used in) Provided by Financing Activities |  |  |  |  |  |  |  |  | (87,868) | 73,119 | 219,471
Net (Decrease) Increase in Cash and Cash Equivalents |  |  |  |  |  |  |  |  | (50,547) | 12,790 | (126)
Cash and Cash Equivalents – Beginning |  |  |  | $ 67,231 |  |  |  | $ 54,441 | 67,231 | 54,441 | 54,567
Cash and Cash Equivalents – Ending | $ 16,684 |  |  |  | $ 67,231 |  |  |  | $ 16,684 | $ 67,231 | $ 54,441

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