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Segment Information - Results of Operations and Selected Financial Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income (expense) | $ 58,699 | $ 57,233 | $ 56,439 | $ 54,768 | $ 51,553 | $ 51,431 | $ 50,868 | $ 49,976 | $ 227,139 | $ 203,828 | $ 188,792
Provision for loan losses | 3,323 | 3,276 | 1,841 | 72 | 1,672 | 2,940 | 2,804 | 4,103 | 8,512 | 11,519 | 7,675
Noninterest income | 32,833 | $ 29,169 | $ 27,983 | $ 28,085 | 27,431 | $ 27,927 | $ 26,057 | $ 25,617 | 118,070 | 107,032 | 105,808
Depreciation and amortization |  |  |  |  |  |  |  |  | 11,791 | 12,383 | 11,901
Other expenses |  |  |  |  |  |  |  |  | 188,601 | 179,021 | 173,814
Income before taxes |  |  |  |  |  |  |  |  | 136,305 | 107,937 | 101,210
Total assets | 7,253,156 |  |  |  | 7,018,952 |  |  |  | 7,253,156 | 7,018,952 | 6,692,829
Capital expenditures |  |  |  |  |  |  |  |  | 18,007 | 10,835 | 11,263
Operating Segments [Member] | Metropolitan Banks [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income (expense) |  |  |  |  |  |  |  |  | 74,274 | 63,519 | 61,500
Provision for loan losses |  |  |  |  |  |  |  |  | 2,457 | 2,229 | 2,684
Noninterest income |  |  |  |  |  |  |  |  | 15,698 | 16,372 | 16,552
Depreciation and amortization |  |  |  |  |  |  |  |  | 2,192 | 2,341 | 2,273
Other expenses |  |  |  |  |  |  |  |  | 35,488 | 34,130 | 32,942
Income before taxes |  |  |  |  |  |  |  |  | 49,835 | 41,191 | 40,153
Total assets | 2,552,024 |  |  |  | 2,493,096 |  |  |  | 2,552,024 | 2,493,096 | 2,277,870
Capital expenditures |  |  |  |  |  |  |  |  | 3,606 | 1,525 | 3,743
Operating Segments [Member] | Community Banks [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income (expense) |  |  |  |  |  |  |  |  | 147,731 | 135,508 | 122,404
Provision for loan losses |  |  |  |  |  |  |  |  | 4,442 | 7,509 | 3,806
Noninterest income |  |  |  |  |  |  |  |  | 54,353 | 57,745 | 52,598
Depreciation and amortization |  |  |  |  |  |  |  |  | 7,790 | 8,281 | 7,894
Other expenses |  |  |  |  |  |  |  |  | 93,619 | 96,627 | 91,655
Income before taxes |  |  |  |  |  |  |  |  | 96,233 | 80,836 | 71,647
Total assets | 4,544,196 |  |  |  | 4,412,174 |  |  |  | 4,544,196 | 4,412,174 | 4,379,205
Capital expenditures |  |  |  |  |  |  |  |  | 12,334 | 7,738 | 4,634
Operating Segments [Member] | Other Financial Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income (expense) |  |  |  |  |  |  |  |  | 5,770 | 6,132 | 6,798
Provision for loan losses |  |  |  |  |  |  |  |  | 1,767 | 1,653 | 1,176
Noninterest income |  |  |  |  |  |  |  |  | 37,842 | 29,711 | 33,629
Depreciation and amortization |  |  |  |  |  |  |  |  | 584 | 510 | 514
Other expenses |  |  |  |  |  |  |  |  | 24,474 | 22,216 | 22,308
Income before taxes |  |  |  |  |  |  |  |  | 16,787 | 11,464 | 16,429
Total assets | 117,332 |  |  |  | 83,594 |  |  |  | 117,332 | 83,594 | 128,697
Capital expenditures |  |  |  |  |  |  |  |  | 64 | 125 | 121
Operating Segments [Member] | Executive, Operations & Support [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income (expense) |  |  |  |  |  |  |  |  | (636) | (1,331) | (1,910)
Provision for loan losses |  |  |  |  |  |  |  |  | (154) | 128 | 9
Noninterest income |  |  |  |  |  |  |  |  | 97,368 | 75,415 | 72,806
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,225 | 1,251 | 1,220
Other expenses |  |  |  |  |  |  |  |  | 36,531 | 26,375 | 27,221
Income before taxes |  |  |  |  |  |  |  |  | 59,130 | 46,330 | 42,446
Total assets | 885,590 |  |  |  | 803,810 |  |  |  | 885,590 | 803,810 | 624,428
Capital expenditures |  |  |  |  |  |  |  |  | 2,003 | 1,447 | 2,765
Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noninterest income |  |  |  |  |  |  |  |  | (87,191) | (72,211) | (69,777)
Other expenses |  |  |  |  |  |  |  |  | (1,511) | (327) | (312)
Income before taxes |  |  |  |  |  |  |  |  | (85,680) | (71,884) | (69,465)
Total assets | $ (845,986) |  |  |  | $ (773,722) |  |  |  | $ (845,986) | $ (773,722) | $ (717,371)

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