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Business Segments - Financial Information by Business Segment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]      
Interest and dividend income $ 484,967 $ 541,277 $ 484,253
Interest expense 27,034 61,797 84,349
NET INTEREST INCOME 457,933 479,480 399,904
Provision for credit losses (64,274) 107,741 11,198
Net interest income after provision for credit losses 522,207 371,739 388,706
Non-interest income 132,785 128,185 116,716
Non-interest expense 353,143 354,845 312,208
Income before provision for income taxes 301,849 145,079 193,214
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
Community Banking [Member]      
Segment Reporting Information [Line Items]      
Interest and dividend income 484,967 541,277 484,253
Interest expense 27,034 61,797 84,349
NET INTEREST INCOME 457,933 479,480 399,904
Provision for credit losses (64,274) 107,741 11,198
Net interest income after provision for credit losses 522,207 371,739 388,706
Non-interest income 103,274 101,850 90,137
Non-interest expense 336,766 338,526 295,747
Income before provision for income taxes 288,715 135,063 183,096
Provision for income taxes 56,831 20,932 32,216
Net income 231,884 114,131  
Preferred stock dividends 10,125 2,644  
Net income available to common shareholders 221,759 111,487 150,880
Trust and Investment Services [Member]      
Segment Reporting Information [Line Items]      
Non-interest income 29,511 26,335 26,579
Non-interest expense 16,377 16,319 16,461
Income before provision for income taxes 13,134 10,016 10,118
Provision for income taxes 2,758 2,103 2,125
Net income 10,376 7,913  
Net income available to common shareholders $ 10,376 $ 7,913 $ 7,993