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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, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Cash Flows from Operating Activities: |  |  |  |  |  |  |  |  |  |  |
Net income | $ 100,669 | $ 116,042 | $ 61,341 | $ 36,595 | $ 56,245 | $ 50,515 | $ 22,718 | $ 3,100 | $ 314,647 | $ 132,578 | $ 79,327
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |  |  |  |  |  |  |  |  |
(Increase) decrease in other assets |  |  |  |  |  |  |  |  | 46,655 | (108,147) | (63,104)
Increase (decrease) in other liabilities |  |  |  |  |  |  |  |  | 102,985 | 50,436 | (27,578)
Cash Flows from Investing Activities |  |  |  |  |  |  |  |  |  |  |
Purchases of investment securities available for sale |  |  |  |  |  |  |  |  | (3,626,377) | (1,201,913) | 0
Cash Flows from Financing Activities |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  | 27,762 | 923 | 2,150
Proceeds from issuance of subordinated long-term debt |  |  |  |  |  |  |  |  | 0 | 0 | 72,030
Proceed from issuance of other long-term borrowings |  |  |  |  |  |  |  |  | 98,799 | 0 | 24,477
Repayments of other borrowings |  |  |  |  |  |  |  |  | 0 | 0 | (25,000)
Redemption of preferred stock |  |  |  |  |  |  |  |  | (82,497) | 0 | 0
Preferred stock dividends paid |  |  |  |  |  |  |  |  | (10,833) | (14,076) | (14,459)
Purchases of treasury stock |  |  |  |  |  |  |  |  | (27,662) | 0 | (571)
Payments of employee taxes withheld from share-based awards |  |  |  |  |  |  |  |  | (5,568) | (2,063) | (1,732)
Net Increase (Decrease) in Cash and Cash Equivalents |  |  |  |  |  |  |  |  | (175,322) | 480,849 | 150,370
Cash and Cash Equivalents – Beginning |  |  |  | 693,354 |  |  |  | 212,505 | 693,354 | 212,505 | 62,135
Cash and Cash Equivalents – Ending | 518,032 |  |  |  | 693,354 |  |  |  | 518,032 | 693,354 | 212,505
Non-cash Investing and Financing Activities: |  |  |  |  |  |  |  |  |  |  |
Distribution of investment in BM Technologies common stock |  |  |  |  |  |  |  |  | 32,983 | 0 | 0
Customers Bancorp |  |  |  |  |  |  |  |  |  |  |
Cash Flows from Operating Activities: |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 314,647 | 132,578 | 79,327
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 |  |  |  |  |  |  |  |  | (151,510) | (76,054) | (14,105)
Distribution of investment in BM Technologies common stock from Bank |  |  |  |  |  |  |  |  | (32,983) | 0 | 0
Loss on sale of foreign subsidiaries |  |  |  |  |  |  |  |  | 2,840 | 0 | 0
(Increase) decrease in other assets |  |  |  |  |  |  |  |  | (5,100) | 5,613 | (3,166)
Increase (decrease) in other liabilities |  |  |  |  |  |  |  |  | 1,054 | 1,088 | 1,775
Net Cash Provided by (Used in) Continuing Operating Activities |  |  |  |  |  |  |  |  | 128,948 | 63,225 | 63,831
Cash Flows from Investing Activities |  |  |  |  |  |  |  |  |  |  |
Purchases of investment securities available for sale |  |  |  |  |  |  |  |  | (20,575) | 0 | 0
Payments for investments in and advances to subsidiaries |  |  |  |  |  |  |  |  | (50,010) | (26) | (74,767)
Proceeds from sales of foreign subsidiaries |  |  |  |  |  |  |  |  | 3,765 | 0 | 0
Net Cash Provided By (Used in) Investing Activities |  |  |  |  |  |  |  |  | (66,820) | (26) | (74,767)
Cash Flows from Financing Activities |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  | 27,762 | 923 | 2,150
Proceeds from issuance of subordinated long-term debt |  |  |  |  |  |  |  |  | 0 | 0 | 72,030
Proceed from issuance of other long-term borrowings |  |  |  |  |  |  |  |  | 98,799 | 0 | 24,477
Repayments of other borrowings |  |  |  |  |  |  |  |  | 0 | 0 | (25,000)
Redemption of preferred stock |  |  |  |  |  |  |  |  | (82,497) | 0 | 0
Preferred stock dividends paid |  |  |  |  |  |  |  |  | (10,833) | (14,076) | (14,459)
Purchases of treasury stock |  |  |  |  |  |  |  |  | (27,662) | 0 | (571)
Payments of employee taxes withheld from share-based awards |  |  |  |  |  |  |  |  | (5,568) | (2,063) | (1,732)
Net Cash Provided by (Used in) Financing Activities |  |  |  |  |  |  |  |  | 1 | (15,216) | 56,895
Net Increase (Decrease) in Cash and Cash Equivalents |  |  |  |  |  |  |  |  | 62,129 | 47,983 | 45,959
Cash and Cash Equivalents – Beginning |  |  |  | $ 110,626 |  |  |  | $ 62,643 | 110,626 | 62,643 | 16,684
Cash and Cash Equivalents – Ending | $ 172,755 |  |  |  | $ 110,626 |  |  |  | 172,755 | 110,626 | 62,643
Non-cash Investing and Financing Activities: |  |  |  |  |  |  |  |  |  |  |
Distribution of investment in BM Technologies common stock |  |  |  |  |  |  |  |  | $ 32,983 | $ 0 | $ 0

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- Definition The cash outflow to reacquire common stock during the period. + 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 http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585 + Details
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- Definition The cash outflow to reacquire preferred stock during the period. + 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 http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585 + Details
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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 http://asc.fasb.org/extlink&oid=123570139&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 http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow to acquire investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3151-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=124260329&loc=d3e26853-111562 + Details
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- Definition The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled 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 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585 + Details
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