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Business Segment Reporting - Schedule of Segment Financial Results (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Segment Reporting Information [Line Items]        
Net interest income $ 209,765 $ 184,384 $ 604,951 $ 536,554
Provision for credit losses (5,000) 16,000 11,500 125,500
Noninterest income 107,907 112,996 348,393 331,876
Noninterest expense 208,869 197,995 611,153 595,147
Income before income taxes 113,803 83,385 330,691 147,783
Income tax expense (benefit) 19,336 10,293 56,169 17,601
NET INCOME 94,467 73,092 274,522 130,182
Average assets 35,873,000 29,481,000 34,402,000 27,891,000
Commercial Banking [Member]        
Segment Reporting Information [Line Items]        
Net interest income 143,935 122,362 412,622 342,406
Provision for credit losses (5,720) 14,032 8,107 115,533
Noninterest income 16,523 22,464 60,294 57,782
Noninterest expense 74,359 65,175 209,144 186,341
Income before income taxes 91,819 65,619 255,665 98,314
Income tax expense (benefit) 15,601 8,100 43,427 11,709
NET INCOME 76,218 57,519 212,238 86,605
Average assets 15,766,000 12,957,000 14,987,000 12,318,000
Institutional Banking [Member]        
Segment Reporting Information [Line Items]        
Net interest income 21,203 23,375 64,599 84,534
Provision for credit losses 172 193 539 766
Noninterest income 65,551 62,688 202,718 191,128
Noninterest expense 73,354 69,667 217,211 215,073
Income before income taxes 13,228 16,203 49,567 59,823
Income tax expense (benefit) 2,248 2,000 8,419 7,125
NET INCOME 10,980 14,203 41,148 52,698
Average assets 11,976,000 10,019,000 11,734,000 9,572,000
Personal Banking [Member]        
Segment Reporting Information [Line Items]        
Net interest income 44,627 38,647 127,730 109,614
Provision for credit losses 548 1,775 2,854 9,201
Noninterest income 25,833 27,844 85,381 82,966
Noninterest expense 61,156 63,153 184,798 193,733
Income before income taxes 8,756 1,563 25,459 (10,354)
Income tax expense (benefit) 1,487 193 4,323 (1,233)
NET INCOME 7,269 1,370 21,136 (9,121)
Average assets $ 8,131,000 $ 6,505,000 $ 7,681,000 $ 6,001,000