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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Cash Flows from Operating Activities: |  |  |
Net income | $ 250,143 | $ 228,034 | $ 314,647
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |
(Increase) decrease in other assets | 23,584 | (3,591) | 46,655
Increase (decrease) in other liabilities | 18,680 | (20,994) | 102,985
Net Cash Provided by (Used in) Continuing Operating Activities | 124,729 | (20,825) | 295,540
Cash Flows from Investing Activities |  |  |
Purchases of investment securities available for sale | (1,425) | (1,357,354) | (3,626,377)
Net Cash Provided By (Used in) Investing Activities | 3,157,723 | (1,298,412) | (1,201,261)
Cash Flows from Financing Activities |  |  |
Proceeds from issuance of common stock | 3,112 | 533 | 27,762
Proceed from issuance of other long-term borrowings | 0 | 0 | 98,799
Repayments of other borrowings | 0 | (100,000) | 0
Redemption of preferred stock | 0 | 0 | (82,497)
Preferred stock dividends paid | (14,636) | (9,326) | (10,833)
Purchases of treasury stock | (39,806) | (33,162) | (27,662)
Payments of employee taxes withheld from share-based awards | (2,433) | (5,063) | (5,568)
Net Cash Provided by (Used in) Financing Activities | 108,088 | 1,257,011 | 754,775
Net Increase (Decrease) in Cash and Cash Equivalents | 3,390,540 | (62,226) | (175,322)
Cash and Cash Equivalents – Beginning Balance | 455,806 | 518,032 | 693,354
Cash and Cash Equivalents – Ending Balance | 3,846,346 | 455,806 | 518,032
Non-cash Investing and Financing Activities: |  |  |
Distribution of investment in BM Technologies common stock | 0 | 0 | 32,983
Customers Bancorp |  |  |
Cash Flows from Operating Activities: |  |  |
Net income | 250,143 | 228,034 | 314,647
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 | (167,184) | (186,018) | (151,510)
Distribution of investment in BM Technologies common stock from Bank | 0 | 0 | (32,983)
Loss on sale of foreign subsidiaries | 0 | 0 | 2,840
(Increase) decrease in other assets | 2,023 | 4,328 | (5,100)
Increase (decrease) in other liabilities | 10,802 | 680 | 1,054
Net Cash Provided by (Used in) Continuing Operating Activities | 95,784 | 47,024 | 128,948
Cash Flows from Investing Activities |  |  |
Purchases of investment securities available for sale | (1,831) | (2,095) | (20,575)
Payments for investments in and advances to subsidiaries | 0 | 0 | (50,010)
Proceeds from sales of foreign subsidiaries | 0 | 0 | 3,765
Other, net | 72 | 0 | 0
Net Cash Provided By (Used in) Investing Activities | (1,759) | (2,095) | (66,820)
Cash Flows from Financing Activities |  |  |
Proceeds from issuance of common stock | 3,947 | 2,720 | 27,762
Proceed from issuance of other long-term borrowings | 0 | 0 | 98,799
Repayments of other borrowings | 0 | (100,000) | 0
Redemption of preferred stock | 0 | 0 | (82,497)
Preferred stock dividends paid | (14,636) | (9,326) | (10,833)
Purchases of treasury stock | (39,806) | (33,162) | (27,662)
Payments of employee taxes withheld from share-based awards | (2,433) | (5,063) | (5,568)
Net Cash Provided by (Used in) Financing Activities | (52,928) | (144,831) | 1
Net Increase (Decrease) in Cash and Cash Equivalents | 41,097 | (99,902) | 62,129
Cash and Cash Equivalents – Beginning Balance | 72,853 | 172,755 | 110,626
Cash and Cash Equivalents – Ending Balance | 113,950 | 72,853 | 172,755
Non-cash Investing and Financing Activities: |  |  |
Distribution of investment in BM Technologies common stock | $ 0 | $ 0 | $ 32,983

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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 -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-15 + 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://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481830/320-10-45-11 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-13 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-11 + Details
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