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Condensed Parent Company Financial Statements - Schedule of Condensed Income Statement (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Condensed Income Statements, Captions [Line Items]      
Income from securities $ 484,967 $ 541,277 $ 484,253
Other income 20,255 21,728 14,355
Interest expense 27,034 61,797 84,349
Other expense 70,061 70,748 62,656
Total non-interest expense 353,143 354,845 312,208
Provision for income taxes 59,589 23,035 34,341
Net income 242,260 122,044 158,873
Preferred stock dividends 10,125 2,644  
Net income available to common shareholders 232,135 119,400 158,873
Parent Company [Member]      
Condensed Income Statements, Captions [Line Items]      
Dividends from subsidiaries—Bank 250,500 64,000 102,000
Dividends from subsidiaries—Nonbank 1,800 1,200 4,471
Income from securities   (22) 15
Other income   485 1,433
Total income 252,300 65,663 107,919
Interest expense 5,673 6,964 7,660
Other expense 5,698 5,415 8,807
Total non-interest expense 11,371 12,379 16,467
Income before income tax benefit and undistributed net income of subsidiaries 240,929 53,284 91,452
Provision for income taxes (4,163) (2,471) (3,207)
Income before undistributed net income of subsidiaries 245,092 55,755 94,659
(Excess dividends) equity in undistributed net income of subsidiaries (2,832) 66,289 64,214
Net income 242,260 122,044 158,873
Preferred stock dividends 10,125 2,644  
Net income available to common shareholders $ 232,135 $ 119,400 $ 158,873