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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

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- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(10)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(8)) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(15)) -URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260 + Details
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