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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income (expense) | $ 66,888 | $ 65,673 | $ 64,880 | $ 63,035 | $ 58,699 | $ 57,233 | $ 56,439 | $ 54,768 | $ 260,476 | $ 227,139 | $ 203,828
Provision for loan losses | 1,516 | 747 | 1,225 | 314 | 3,323 | 3,276 | 1,841 | 72 | 3,802 | 8,512 | 11,519
Noninterest income | 31,851 | $ 32,801 | $ 30,437 | $ 30,110 | 32,833 | $ 29,169 | $ 27,983 | $ 28,085 | 125,199 | 118,070 | 107,032
Depreciation and amortization |  |  |  |  |  |  |  |  | 13,546 | 11,791 | 12,383
Other expenses |  |  |  |  |  |  |  |  | 208,575 | 188,601 | 179,021
Income before taxes |  |  |  |  |  |  |  |  | 159,752 | 136,305 | 107,937
Total assets | 7,574,258 |  |  |  | 7,253,156 |  |  |  | 7,574,258 | 7,253,156 | 7,018,952
Capital expenditures |  |  |  |  |  |  |  |  | 51,863 | 18,007 | 10,835
Operating Segments [Member] | Metropolitan Banks [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income (expense) |  |  |  |  |  |  |  |  | 84,043 | 74,274 | 63,519
Provision for loan losses |  |  |  |  |  |  |  |  | 79 | 2,457 | 2,229
Noninterest income |  |  |  |  |  |  |  |  | 16,625 | 15,698 | 16,372
Depreciation and amortization |  |  |  |  |  |  |  |  | 2,364 | 2,192 | 2,341
Other expenses |  |  |  |  |  |  |  |  | 36,873 | 35,488 | 34,130
Income before taxes |  |  |  |  |  |  |  |  | 61,352 | 49,835 | 41,191
Total assets | 2,743,876 |  |  |  | 2,552,024 |  |  |  | 2,743,876 | 2,552,024 | 2,493,096
Capital expenditures |  |  |  |  |  |  |  |  | 3,003 | 3,606 | 1,525
Operating Segments [Member] | Community Banks [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income (expense) |  |  |  |  |  |  |  |  | 170,096 | 147,731 | 135,508
Provision for loan losses |  |  |  |  |  |  |  |  | 4,178 | 4,442 | 7,509
Noninterest income |  |  |  |  |  |  |  |  | 60,004 | 54,353 | 57,745
Depreciation and amortization |  |  |  |  |  |  |  |  | 9,092 | 7,790 | 8,281
Other expenses |  |  |  |  |  |  |  |  | 106,674 | 93,619 | 96,627
Income before taxes |  |  |  |  |  |  |  |  | 110,156 | 96,233 | 80,836
Total assets | 4,892,946 |  |  |  | 4,544,196 |  |  |  | 4,892,946 | 4,544,196 | 4,412,174
Capital expenditures |  |  |  |  |  |  |  |  | 21,393 | 12,334 | 7,738
Operating Segments [Member] | Other Financial Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income (expense) |  |  |  |  |  |  |  |  | 5,341 | 5,770 | 6,132
Provision for loan losses |  |  |  |  |  |  |  |  | (466) | 1,767 | 1,653
Noninterest income |  |  |  |  |  |  |  |  | 37,743 | 37,842 | 29,711
Depreciation and amortization |  |  |  |  |  |  |  |  | 588 | 584 | 510
Other expenses |  |  |  |  |  |  |  |  | 24,895 | 24,474 | 22,216
Income before taxes |  |  |  |  |  |  |  |  | 18,067 | 16,787 | 11,464
Total assets | 84,706 |  |  |  | 117,332 |  |  |  | 84,706 | 117,332 | 83,594
Capital expenditures |  |  |  |  |  |  |  |  | 1,035 | 64 | 125
Operating Segments [Member] | Executive, Operations & Support [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income (expense) |  |  |  |  |  |  |  |  | 996 | (636) | (1,331)
Provision for loan losses |  |  |  |  |  |  |  |  | 11 | (154) | 128
Noninterest income |  |  |  |  |  |  |  |  | 137,364 | 97,368 | 75,415
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,502 | 1,225 | 1,251
Other expenses |  |  |  |  |  |  |  |  | 42,319 | 36,531 | 26,375
Income before taxes |  |  |  |  |  |  |  |  | 94,528 | 59,130 | 46,330
Total assets | 861,782 |  |  |  | 885,590 |  |  |  | 861,782 | 885,590 | 803,810
Capital expenditures |  |  |  |  |  |  |  |  | 26,432 | 2,003 | 1,447
Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noninterest income |  |  |  |  |  |  |  |  | (126,537) | (87,191) | (72,211)
Other expenses |  |  |  |  |  |  |  |  | (2,186) | (1,511) | (327)
Income before taxes |  |  |  |  |  |  |  |  | (124,351) | (85,680) | (71,884)
Total assets | $ (1,009,052) |  |  |  | $ (845,986) |  |  |  | $ (1,009,052) | $ (845,986) | $ (773,722)

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