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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, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Cash Flows from Operating Activities: |  |  |  |  |  |  |  |  |  |  |
Net income | $ 28,711 | $ 63,912 | $ 58,650 | $ 76,761 | $ 100,669 | $ 116,042 | $ 61,341 | $ 36,595 | $ 228,034 | $ 314,647 | $ 132,578
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |  |  |  |  |  |  |  |  |
(Increase) decrease in other assets |  |  |  |  |  |  |  |  | (3,591) | 46,655 | (108,147)
Increase (decrease) in other liabilities |  |  |  |  |  |  |  |  | (20,994) | 102,985 | 50,436
Cash Flows from Investing Activities |  |  |  |  |  |  |  |  |  |  |
Purchases of investment securities available for sale |  |  |  |  |  |  |  |  | (1,357,354) | (3,626,377) | (1,201,913)
Cash Flows from Financing Activities |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  | 533 | 27,762 | 923
Proceed from issuance of other long-term borrowings |  |  |  |  |  |  |  |  | 0 | 98,799 | 0
Repayments of other borrowings |  |  |  |  |  |  |  |  | (100,000) | 0 | 0
Redemption of preferred stock |  |  |  |  |  |  |  |  | 0 | (82,497) | 0
Preferred stock dividends paid |  |  |  |  |  |  |  |  | (9,326) | (10,833) | (14,076)
Purchases of treasury stock |  |  |  |  |  |  |  |  | (33,162) | (27,662) | 0
Payments of employee taxes withheld from share-based awards |  |  |  |  |  |  |  |  | (5,063) | (5,568) | (2,063)
Net Increase (Decrease) in Cash and Cash Equivalents |  |  |  |  |  |  |  |  | (62,226) | (175,322) | 480,849
Cash and Cash Equivalents – Beginning Balance |  |  |  | 518,032 |  |  |  | 693,354 | 518,032 | 693,354 | 212,505
Cash and Cash Equivalents – Ending Balance | 455,806 |  |  |  | 518,032 |  |  |  | 455,806 | 518,032 | 693,354
Non-cash Investing and Financing Activities: |  |  |  |  |  |  |  |  |  |  |
Distribution of investment in BM Technologies common stock |  |  |  |  |  |  |  |  | 0 | 32,983 | 0
Customers Bancorp |  |  |  |  |  |  |  |  |  |  |
Cash Flows from Operating Activities: |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 228,034 | 314,647 | 132,578
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 |  |  |  |  |  |  |  |  | (186,018) | (151,510) | (76,054)
Distribution of investment in BM Technologies common stock from Bank |  |  |  |  |  |  |  |  | 0 | (32,983) | 0
Loss on sale of foreign subsidiaries |  |  |  |  |  |  |  |  | 0 | 2,840 | 0
(Increase) decrease in other assets |  |  |  |  |  |  |  |  | 4,328 | (5,100) | 5,613
Increase (decrease) in other liabilities |  |  |  |  |  |  |  |  | 680 | 1,054 | 1,088
Net Cash Provided by (Used in) Continuing Operating Activities |  |  |  |  |  |  |  |  | 47,024 | 128,948 | 63,225
Cash Flows from Investing Activities |  |  |  |  |  |  |  |  |  |  |
Purchases of investment securities available for sale |  |  |  |  |  |  |  |  | (2,095) | (20,575) | 0
Payments for investments in and advances to subsidiaries |  |  |  |  |  |  |  |  | 0 | (50,010) | (26)
Proceeds from sales of foreign subsidiaries |  |  |  |  |  |  |  |  | 0 | 3,765 | 0
Net Cash Provided By (Used in) Investing Activities |  |  |  |  |  |  |  |  | (2,095) | (66,820) | (26)
Cash Flows from Financing Activities |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  | 2,720 | 27,762 | 923
Proceed from issuance of other long-term borrowings |  |  |  |  |  |  |  |  | 0 | 98,799 | 0
Repayments of other borrowings |  |  |  |  |  |  |  |  | (100,000) | 0 | 0
Redemption of preferred stock |  |  |  |  |  |  |  |  | 0 | (82,497) | 0
Preferred stock dividends paid |  |  |  |  |  |  |  |  | (9,326) | (10,833) | (14,076)
Purchases of treasury stock |  |  |  |  |  |  |  |  | (33,162) | (27,662) | 0
Payments of employee taxes withheld from share-based awards |  |  |  |  |  |  |  |  | (5,063) | (5,568) | (2,063)
Net Cash Provided by (Used in) Financing Activities |  |  |  |  |  |  |  |  | (144,831) | 1 | (15,216)
Net Increase (Decrease) in Cash and Cash Equivalents |  |  |  |  |  |  |  |  | (99,902) | 62,129 | 47,983
Cash and Cash Equivalents – Beginning Balance |  |  |  | $ 172,755 |  |  |  | $ 110,626 | 172,755 | 110,626 | 62,643
Cash and Cash Equivalents – Ending Balance | $ 72,853 |  |  |  | $ 172,755 |  |  |  | 72,853 | 172,755 | 110,626
Non-cash Investing and Financing Activities: |  |  |  |  |  |  |  |  |  |  |
Distribution of investment in BM Technologies common stock |  |  |  |  |  |  |  |  | $ 0 | $ 32,983 | $ 0

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- Definition Amount of cash outflow in the form of ordinary dividends to preferred shareholders of the parent entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3291-108585 + Details
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