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Condensed Parent Company Financial Statements - Schedule of Condensed Income Statement (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Condensed Income Statements, Captions [Line Items]      
Income from securities $ 513,656 $ 484,967 $ 541,277
Other income 19,470 20,255 21,728
Interest expense 39,343 27,034 61,797
Other expense 64,317 70,061 70,748
Total non-interest expense 356,966 353,143 354,845
Provision for income taxes 44,288 59,589 23,035
Net income 192,113 242,260 122,044
Preferred stock dividends 10,125 10,125 2,644
Net income available to common shareholders 181,988 232,135 119,400
Parent Company [Member]      
Condensed Income Statements, Captions [Line Items]      
Dividends from subsidiaries—Bank 172,500 250,500 64,000
Dividends from subsidiaries—Nonbank 1,750 1,800 1,200
Income from securities     (22)
Other income 4   485
Total income 174,254 252,300 65,663
Interest expense 10,860 5,673 6,964
Other expense 5,851 5,698 5,415
Total non-interest expense 16,711 11,371 12,379
Income before income tax benefit and undistributed net income of subsidiaries 157,543 240,929 53,284
Provision for income taxes (3,652) (4,163) (2,471)
Income before undistributed net income of subsidiaries 161,195 245,092 55,755
Equity in undistributed net income (excess dividends) of subsidiaries 30,918 (2,832) 66,289
Net income 192,113 242,260 122,044
Preferred stock dividends 10,125 10,125 2,644
Net income available to common shareholders $ 181,988 $ 232,135 $ 119,400