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Condensed Financial Statements of Parent Company - Summary of Condensed Statements of Cash Flows of Parent Company (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Cash Flows from Operating Activities: |  |  |
Net income | $ 78,837 | $ 78,702 | $ 58,583
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Loss (gain) on sale of investment securities | (8,800) | (25) | 85
(Increase) decrease in other assets | (32,256) | (11,538) | (12,024)
Increase (decrease) in other liabilities | (16,687) | 5,819 | 8,706
Cash Flows from Investing Activities: |  |  |
Proceeds from sales of investment securities available for sale | 769,203 | 2,852 | 806
Cash Flows from Financing Activities: |  |  |
Proceeds from issuance of common stock | 2,716 | 70,985 | 806
Net proceeds from issuance of preferred stock | 0 | 161,902 | 55,569
Proceeds from issuance of long-term debt | 98,564 | 0 | 0
Exercise and redemption of warrants | 1,059 | 1,532 | 98
Preferred stock dividends paid | (14,459) | (9,051) | (2,314)
Net Increase (Decrease) in Cash and Cash Equivalents | (118,386) | 116 | (106,430)
Cash and Cash Equivalents – Beginning | 264,709 | 264,593 | 371,023
Cash and Cash Equivalents – Ending | 146,323 | 264,709 | 264,593
Customers Bancorp |  |  |
Cash Flows from Operating Activities: |  |  |
Net income | 78,837 | 78,702 | 58,583
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Equity in undistributed earnings of subsidiaries, net of dividends received from Bank | (46,743) | (59,765) | (46,980)
Loss (gain) on sale of investment securities | 0 | 1 | 0
(Increase) decrease in other assets | 7,624 | (7,721) | 2,488
Increase (decrease) in other liabilities | (1,322) | 54 | (112)
Net Cash Provided by Operating Activities | 38,396 | 11,271 | 13,979
Cash Flows from Investing Activities: |  |  |
Proceeds from sales of investment securities available for sale | 0 | 4 | 0
Payments for investments in and advances to subsidiaries | (98,725) | (230,872) | (30,036)
Net Cash Used in Investing Activities | (98,725) | (230,868) | (30,036)
Cash Flows from Financing Activities: |  |  |
Proceeds from issuance of common stock | 2,716 | 70,985 | 904
Net proceeds from issuance of preferred stock | 0 | 161,902 | 55,569
Proceeds from issuance of long-term debt | 98,564 | 0 | 0
Exercise and redemption of warrants | 1,059 | 1,532 | 0
Payments of employee taxes withheld from share-based awards | (14,761) | (5,897) | 0
Preferred stock dividends paid | (14,459) | (9,051) | (2,314)
Net Cash Provided by Financing Activities | 73,119 | 219,471 | 54,159
Net Increase (Decrease) in Cash and Cash Equivalents | 12,790 | (126) | 38,102
Cash and Cash Equivalents – Beginning | 54,441 | 54,567 | 16,465
Cash and Cash Equivalents – Ending | $ 67,231 | $ 54,441 | $ 54,567

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