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Condensed Financial Statements of Parent Company - Summary of Condensed Income Statements of Parent Company (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Operating expense: |  |  |  |  |  |  |  |  |  |  |
Interest | $ 134,510 | $ 76,884 | $ 31,482 | $ 18,777 | $ 20,343 | $ 22,959 | $ 24,124 | $ 28,384 | $ 261,653 | $ 95,810 | $ 139,616
Income tax benefit | (7,136) | (17,899) | (18,896) | (19,332) | (12,993) | (36,263) | (20,124) | (17,560) | (63,263) | (86,940) | (46,717)
Net income | 28,711 | 63,912 | 58,650 | 76,761 | 100,669 | 116,042 | 61,341 | 36,595 | 228,034 | 314,647 | 132,578
Preferred stock dividends | 3,088 | 2,548 | 2,131 | 1,865 | 2,022 | 2,981 | 3,299 | 3,391 | 9,632 | 11,693 | 14,041
Loss on redemption of preferred stock |  |  |  |  | 0 | 2,820 | 0 | 0 | 0 | 2,820 | 0
Net income available to common shareholders | $ 25,623 | $ 61,364 | $ 56,519 | $ 74,896 | $ 98,647 | $ 110,241 | $ 58,042 | $ 33,204 | 218,402 | 300,134 | 118,537
Comprehensive income |  |  |  |  |  |  |  |  | 69,918 | 315,431 | 128,064
Customers Bancorp |  |  |  |  |  |  |  |  |  |  |
Operating income: |  |  |  |  |  |  |  |  |  |  |
Dividends from bank subsidiary |  |  |  |  |  |  |  |  | 52,000 | 172,982 | 65,000
Loss on sale of foreign subsidiaries |  |  |  |  |  |  |  |  | 0 | (2,809) | 0
Other |  |  |  |  |  |  |  |  | 1,264 | 0 | 0
Total operating income |  |  |  |  |  |  |  |  | 53,264 | 170,173 | 65,000
Operating expense: |  |  |  |  |  |  |  |  |  |  |
Interest |  |  |  |  |  |  |  |  | 10,657 | 10,879 | 9,681
Other |  |  |  |  |  |  |  |  | 3,410 | 3,121 | 1,498
Total operating expense |  |  |  |  |  |  |  |  | 14,067 | 14,000 | 11,179
Income before taxes and undistributed income of subsidiaries |  |  |  |  |  |  |  |  | 39,197 | 156,173 | 53,821
Income tax benefit |  |  |  |  |  |  |  |  | 2,819 | 6,964 | 2,703
Income before undistributed income of subsidiaries |  |  |  |  |  |  |  |  | 42,016 | 163,137 | 56,524
Equity in undistributed income of subsidiaries |  |  |  |  |  |  |  |  | 186,018 | 151,510 | 76,054
Net income |  |  |  |  |  |  |  |  | 228,034 | 314,647 | 132,578
Preferred stock dividends |  |  |  |  |  |  |  |  | 9,632 | 11,693 | 14,041
Loss on redemption of preferred stock |  |  |  |  |  |  |  |  | 0 | 2,820 | 0
Net income available to common shareholders |  |  |  |  |  |  |  |  | 218,402 | 300,134 | 118,537
Comprehensive income |  |  |  |  |  |  |  |  | $ 69,918 | $ 315,431 | $ 128,064

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