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Business Segment Reporting - Schedule of Segment Financial Results (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Segment Reporting Information [Line Items]        
Net interest income $ 224,791 $ 201,071 $ 435,146 $ 395,186
Provision for credit losses 13,400 24,000 6,900 16,500
Noninterest income 176,335 131,589 300,013 240,486
Noninterest expense 214,127 201,338 428,905 402,284
Income before income taxes 173,599 107,322 299,354 216,888
Income tax expense 36,043 19,910 55,835 36,833
NET INCOME 137,556 87,412 243,519 180,055
Average assets 37,563,000 34,264,000 38,353,000 33,654,000
Commercial Banking [Member]        
Segment Reporting Information [Line Items]        
Net interest income 149,094 142,878 294,096 279,287
Provision for credit losses 12,067 21,993 5,027 13,816
Noninterest income 56,894 37,106 83,594 45,281
Noninterest expense 79,521 73,472 159,110 143,196
Income before income taxes 114,400 84,519 213,553 167,556
Income tax expense 23,752 15,679 39,831 28,455
NET INCOME 90,648 68,840 173,722 139,101
Average assets 16,829,000 14,993,000 16,824,000 14,593,000
Institutional Banking [Member]        
Segment Reporting Information [Line Items]        
Net interest income 34,981 21,258 61,233 43,397
Provision for credit losses 89 147 240 367
Noninterest income 81,082 68,745 154,354 137,166
Noninterest expense 76,511 72,575 152,112 143,857
Income before income taxes 39,463 17,281 63,235 36,339
Income tax expense 8,193 3,206 11,795 6,171
NET INCOME 31,270 14,075 51,440 30,168
Average assets 13,577,000 11,611,000 14,125,000 11,608,000
Personal Banking [Member]        
Segment Reporting Information [Line Items]        
Net interest income 40,716 36,935 79,817 72,502
Provision for credit losses 1,244 1,860 1,633 2,317
Noninterest income 38,359 25,738 62,065 58,039
Noninterest expense 58,095 55,291 117,683 115,231
Income before income taxes 19,736 5,522 22,566 12,993
Income tax expense 4,098 1,025 4,209 2,207
NET INCOME 15,638 4,497 18,357 10,786
Average assets $ 7,157,000 $ 7,660,000 $ 7,404,000 $ 7,453,000