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Segment Information - Results of Operations and Selected Financial Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income (expense) | $ 64,880 | $ 56,439 | $ 127,915 | $ 111,207 |
Noninterest income | 30,437 | 27,983 | 60,547 | 56,068 |
Income before taxes | 39,836 | 33,628 | 76,777 | 66,821 |
Total Assets | 7,622,963 |  | 7,622,963 |  | $ 7,253,156
Operating Segments [Member] | Metropolitan Banks [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income (expense) | 21,084 | 17,832 | 41,388 | 36,352 |
Noninterest income | 4,184 | 3,945 | 8,125 | 7,767 |
Income before taxes | 14,883 | 11,784 | 29,619 | 24,858 |
Total Assets | 2,741,192 |  | 2,741,192 |  | 2,552,024
Operating Segments [Member] | Community Banks [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income (expense) | 42,068 | 37,047 | 83,450 | 72,170 |
Noninterest income | 14,832 | 13,660 | 28,785 | 26,937 |
Income before taxes | 27,942 | 24,509 | 54,290 | 47,228 |
Total Assets | 4,894,018 |  | 4,894,018 |  | 4,544,196
Operating Segments [Member] | Other Financial Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income (expense) | 1,358 | 1,698 | 2,833 | 3,193 |
Noninterest income | 8,896 | 7,456 | 18,520 | 15,766 |
Income before taxes | 4,028 | 3,119 | 9,071 | 6,764 |
Total Assets | 79,503 |  | 79,503 |  | 117,332
Operating Segments [Member] | Executive, Operations & Support [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income (expense) | 370 | (138) | 244 | (508) |
Noninterest income | 33,609 | 25,644 | 65,803 | 50,116 |
Income before taxes | 23,622 | 16,720 | 43,537 | 32,231 |
Total Assets | 843,347 |  | 843,347 |  | 885,590
Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Noninterest income | (31,084) | (22,722) | (60,686) | (44,518) |
Income before taxes | (30,639) | $ (22,504) | (59,740) | $ (44,260) |
Total Assets | $ (935,097) |  | $ (935,097) |  | $ (845,986)

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