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Business Segments - Financial Information by Business Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Segment Reporting Information [Line Items]        
Interest and dividend income $ 117,348 $ 108,393 $ 355,944 $ 293,596
Interest expense 21,228 18,460 63,003 48,127
Net interest income 96,120 89,933 292,941 245,469
Provision for credit losses 4,121 1,035 9,375 4,911
Net interest income after provision for credit losses 91,999 88,898 283,566 240,558
Non-interest income 26,950 26,224 85,878 73,715
Non-interest expense 73,268 76,120 219,652 194,234
Income before provision for income taxes 45,681 39,002 149,792 120,039
Provision for income taxes 8,334 6,516 27,295 20,855
Net income 37,347 32,486 122,497 99,184
Community Banking [Member]        
Segment Reporting Information [Line Items]        
Interest and dividend income 117,348 108,393 355,944 293,596
Interest expense 21,228 18,460 63,003 48,127
Net interest income 96,120 89,933 292,941 245,469
Provision for credit losses 4,121 1,035 9,375 4,911
Net interest income after provision for credit losses 91,999 88,898 283,566 240,558
Non-interest income 20,525 19,959 65,998 55,195
Non-interest expense 69,068 72,378 207,299 183,298
Income before provision for income taxes 43,456 36,479 142,265 112,455
Provision for income taxes 7,866 5,986 25,714 19,262
Net income 35,590 30,493 116,551 93,193
Trust and Investment Services [Member]        
Segment Reporting Information [Line Items]        
Non-interest income 6,425 6,265 19,880 18,520
Non-interest expense 4,200 3,742 12,353 10,936
Income before provision for income taxes 2,225 2,523 7,527 7,584
Provision for income taxes 468 530 1,581 1,593
Net income $ 1,757 $ 1,993 $ 5,946 $ 5,991