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Business Segments - Financial Information by Business Segment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Segment Reporting Information [Line Items]      
Interest and dividend income $ 513,656 $ 484,967 $ 541,277
Interest expense 39,343 27,034 61,797
NET INTEREST INCOME 474,313 457,933 479,480
Provision for credit losses (1,663) (64,274) 107,741
Net interest income after provision for credit losses 475,976 522,207 371,739
Non-interest income 117,391 132,785 128,185
Non-interest expense 356,966 353,143 354,845
Income before provision for income taxes 236,401 301,849 145,079
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
Community Banking [Member]      
Segment Reporting Information [Line Items]      
Interest and dividend income 513,656 484,967 541,277
Interest expense 39,343 27,034 61,797
NET INTEREST INCOME 474,313 457,933 479,480
Provision for credit losses (1,663) (64,274) 107,741
Net interest income after provision for credit losses 475,976 522,207 371,739
Non-interest income 89,840 103,274 101,850
Non-interest expense 340,573 336,766 338,526
Income before provision for income taxes 225,243 288,715 135,063
Provision for income taxes 41,945 56,831 20,932
Net income 183,298 231,884 114,131
Preferred stock dividends 10,125 10,125 2,644
Net income available to common shareholders 173,173 221,759 111,487
Trust and Investment Services [Member]      
Segment Reporting Information [Line Items]      
Non-interest income 27,551 29,511 26,335
Non-interest expense 16,393 16,377 16,319
Income before provision for income taxes 11,158 13,134 10,016
Provision for income taxes 2,343 2,758 2,103
Net income 8,815 10,376 7,913
Net income available to common shareholders $ 8,815 $ 10,376 $ 7,913