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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Cash Flows from Operating Activities: |  |  |
Net income | $ 181,469 | $ 250,143 | $ 228,034
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |
(Increase) decrease in other assets | (99,977) | 23,584 | (3,591)
Increase (decrease) in other liabilities | (32,834) | 18,680 | (20,994)
Cash Flows from Investing Activities |  |  |
Purchases of investment securities available for sale | (845,788) | (1,425) | (1,357,354)
Net Cash Provided By (Used in) Investing Activities | (1,006,091) | 3,157,723 | (1,298,412)
Cash Flows from Financing Activities |  |  |
Proceeds from issuance of common stock | 1,761 | 3,112 | 533
Repayments of other borrowings | (25,000) | 0 | (100,000)
Preferred stock dividends paid | (15,147) | (14,636) | (9,326)
Purchases of treasury stock | (19,243) | (39,806) | (33,162)
Payments of employee taxes withheld from share-based awards | (5,452) | (2,433) | (5,063)
Net Cash Provided by (Used in) Financing Activities | 800,619 | 108,088 | 1,257,011
Net Increase (Decrease) in Cash and Cash Equivalents | (60,415) | 3,390,540 | (62,226)
Cash and Cash Equivalents – Beginning Balance | 3,846,346 | 455,806 | 518,032
Cash and Cash Equivalents – Ending Balance | 3,785,931 | 3,846,346 | 455,806
Customers Bancorp |  |  |
Cash Flows from Operating Activities: |  |  |
Net income | 181,469 | 250,143 | 228,034
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 | (65,215) | (167,184) | (186,018)
(Increase) decrease in other assets | (366) | 2,023 | 4,328
Increase (decrease) in other liabilities | 110 | 10,802 | 680
Net Cash Provided by (Used in) Operating Activities | 115,998 | 95,784 | 47,024
Cash Flows from Investing Activities |  |  |
Purchases of investment securities available for sale | (510) | (1,831) | (2,095)
Other, net | 92 | 72 | 0
Net Cash Provided By (Used in) Investing Activities | (418) | (1,759) | (2,095)
Cash Flows from Financing Activities |  |  |
Proceeds from issuance of common stock | 2,638 | 3,947 | 2,720
Repayments of other borrowings | (25,000) | 0 | (100,000)
Preferred stock dividends paid | (15,147) | (14,636) | (9,326)
Purchases of treasury stock | (19,243) | (39,806) | (33,162)
Payments of employee taxes withheld from share-based awards | (5,452) | (2,433) | (5,063)
Net Cash Provided by (Used in) Financing Activities | (62,204) | (52,928) | (144,831)
Net Increase (Decrease) in Cash and Cash Equivalents | 53,376 | 41,097 | (99,902)
Cash and Cash Equivalents – Beginning Balance | 113,950 | 72,853 | 172,755
Cash and Cash Equivalents – Ending Balance | $ 167,326 | $ 113,950 | $ 72,853

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