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Business Segments - Financial Information by Business Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Interest and dividend income | $ 119,543 | $ 98,888 | $ 238,596 | $ 185,203
Interest expense | 21,083 | 16,541 | 41,774 | 29,667
Net interest income | 98,460 | 82,347 | 196,822 | 155,536
Provision for credit losses | 2,747 | 1,708 | 5,254 | 3,876
Net interest income after provision for credit losses | 95,713 | 80,639 | 191,568 | 151,660
Non-interest income | 31,156 | 23,408 | 58,929 | 47,491
Non-interest expense | 71,952 | 63,543 | 146,385 | 118,114
Income before provision for income taxes | 54,917 | 40,504 | 104,112 | 81,037
Provision for income taxes | 10,103 | 7,335 | 18,961 | 14,339
Net income | 44,814 | 33,169 | 85,151 | 66,698
Community Banking [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Interest and dividend income | 119,543 | 98,888 | 238,596 | 185,203
Interest expense | 21,083 | 16,541 | 41,774 | 29,667
Net interest income | 98,460 | 82,347 | 196,822 | 155,536
Provision for credit losses | 2,747 | 1,708 | 5,254 | 3,876
Net interest income after provision for credit losses | 95,713 | 80,639 | 191,568 | 151,660
Non-interest income | 24,817 | 17,656 | 45,475 | 35,236
Non-interest expense | 67,957 | 60,026 | 138,233 | 110,920
Income before provision for income taxes | 52,573 | 38,269 | 98,810 | 75,976
Provision for income taxes | 9,611 | 6,865 | 17,848 | 13,276
Net income | 42,962 | 31,404 | 80,962 | 62,700
Trust and Investment Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Non-interest income | 6,339 | 5,752 | 13,454 | 12,255
Non-interest expense | 3,995 | 3,517 | 8,152 | 7,194
Income before provision for income taxes | 2,344 | 2,235 | 5,302 | 5,061
Provision for income taxes | 492 | 470 | 1,113 | 1,063
Net income | $ 1,852 | $ 1,765 | $ 4,189 | $ 3,998

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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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