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Selected Quarterly Financial Data (Unaudited) - Schedule of Quarterly Financial Information (Detail) - USD ($)
$ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract]                      
Interest income $ 269,647 $ 235,916 $ 196,334 $ 183,476 $ 214,037 $ 242,851 $ 162,881 $ 161,115 $ 885,373 $ 780,884 $ 543,304
Interest expense 134,510 76,884 31,482 18,777 20,343 22,959 24,124 28,384 261,653 95,810 139,616
Net interest income 135,137 159,032 164,852 164,699 193,694 219,892 138,757 132,731 623,720 685,074 403,688
Provision (benefit) for credit losses on loans and leases 28,216 (7,994) 23,847 15,997 13,890 13,164 3,291 (2,919)      
Non-interest income 7,345 (9,017) 12,746 21,198 16,991 25,586 16,822 18,468 32,272 77,867 63,818
Non-interest expenses 78,419 76,198 76,205 73,807 81,548 80,009 70,823 61,927 304,629 294,307 214,976
Income before income tax expense 35,847 81,811 77,546 96,093 115,247 152,305 81,465 92,191 291,297 441,208 189,756
Provision for income taxes 7,136 17,899 18,896 19,332 12,993 36,263 20,124 17,560 63,263 86,940 46,717
Net income from continuing operations         102,254 116,042 61,341 74,631 228,034 354,268 143,039
Loss from discontinued operations before income tax expense (benefit)         0 0 0 (20,354) 0 (20,354) (13,798)
Income tax expense (benefit) from discontinued operations         1,585 0 0 17,682 0 19,267 (3,337)
Net loss from discontinued operations         (1,585) 0 0 (38,036) 0 (39,621) (10,461)
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
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
Earnings per common share:                      
Basic earnings per common share from continuing operations (usd per share) $ 0.79 $ 1.89 $ 1.73 $ 2.27 $ 3.07 $ 3.40 $ 1.80 $ 2.23 $ 6.69 $ 10.51 $ 4.09
Basic earnings per share (usd per share) 0.79 1.89 1.73 2.27 3.02 3.40 1.80 1.04 6.69 9.29 3.76
Diluted earnings (loss) per common share from continuing operations (usd per share) 0.77 1.85 1.68 2.18 2.92 3.25 1.72 2.17 6.51 10.08 4.07
Diluted earnings per share (usd per share) $ 0.77 $ 1.85 $ 1.68 $ 2.18 $ 2.87 $ 3.25 $ 1.72 $ 1.01 $ 6.51 $ 8.91 $ 3.74