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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, 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
Quarterly Financial Information Disclosure [Abstract]                      
Interest income $ 214,037 $ 242,851 $ 162,881 $ 161,115 $ 153,093 $ 139,650 $ 125,218 $ 125,343 $ 780,884 $ 543,304 $ 463,739
Interest expense 20,343 22,959 24,124 28,384 30,147 32,211 33,236 44,022 95,810 139,616 186,429
Net interest income 193,694 219,892 138,757 132,731 122,946 107,439 91,982 81,321 685,074 403,688 277,310
Provision for credit losses on loans and leases 13,890 13,164 3,291 (2,919) (2,913) 12,955 20,946 31,786 27,426 62,774 24,227
Non-interest income 16,991 25,586 16,822 18,468 16,083 24,864 11,711 11,160 77,867 63,818 35,284
Non-interest expenses 81,548 80,009 70,823 61,927 59,933 56,285 49,791 48,967 294,307 214,976 180,588
Income before income tax expense 115,247 152,305 81,465 92,191 82,009 63,063 32,956 11,728 441,208 189,756 107,779
Provision for income taxes 12,993 36,263 20,124 17,560 23,447 12,016 7,980 3,274 86,940 46,717 26,392
Net income from continuing operations 102,254 116,042 61,341 74,631 58,562 51,047 24,976 8,454 354,268 143,039 81,387
Loss from discontinued operations before income tax expense (benefit) 0 0 0 (20,354) (3,539) (347) (3,190) (6,722) (20,354) (13,798) (5,659)
Income tax expense (benefit) from discontinued operations 1,585 0 0 17,682 (1,222) 185 (932) (1,368) 19,267 (3,337) (3,599)
Net loss from discontinued operations (1,585) 0 0 (38,036) (2,317) (532) (2,258) (5,354) (39,621) (10,461) (2,060)
Net income 100,669 116,042 61,341 36,595 56,245 50,515 22,718 3,100 314,647 132,578 79,327
Preferred stock dividends 2,022 2,981 3,299 3,391 3,414 3,430 3,581 3,615 11,693 14,041 14,459
Loss on redemption of preferred stock 0 2,820 0 0         2,820 0 0
Net income available to common shareholders $ 98,647 $ 110,241 $ 58,042 $ 33,204 $ 52,831 $ 47,085 $ 19,137 $ (515) $ 300,134 $ 118,537 $ 64,868
Earnings per common share:                      
Basic earnings per common share from continuing operations (usd per share) $ 3.07 $ 3.40 $ 1.80 $ 2.23 $ 1.74 $ 1.51 $ 0.68 $ 0.15 $ 10.51 $ 4.09 $ 2.15
Basic earnings per share (usd per share) 3.02 3.40 1.80 1.04 1.67 1.49 0.61 (0.02) 9.29 3.76 2.08
Diluted earnings (loss) per common share from continuing operations (usd per share) 2.92 3.25 1.72 2.17 1.73 1.50 0.68 0.15 10.08 4.07 2.12
Diluted earnings per share (usd per share) $ 2.87 $ 3.25 $ 1.72 $ 1.01 $ 1.65 $ 1.48 $ 0.61 $ (0.02) $ 8.91 $ 3.74 $ 2.05