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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

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