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Segment Information - Results of Operations and Selected Financial Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income (expense) | $ 51,431 | $ 46,876 | $ 152,275 | $ 138,717 |
Noninterest income | 27,927 | 25,324 | 79,601 | 79,335 |
Income before taxes | 27,214 | 24,424 | 78,814 | 77,319 |
Total Assets | 6,783,537 |  | 6,783,537 |  | $ 6,692,829
Operating Segments [Member] | Metropolitan Banks [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income (expense) | 15,893 | 15,221 | 47,435 | 45,946 |
Noninterest income | 4,235 | 3,755 | 12,121 | 10,745 |
Income before taxes | 10,970 | 9,463 | 30,558 | 29,152 |
Total Assets | 2,351,771 |  | 2,351,771 |  | 2,277,870
Operating Segments [Member] | Community Banks [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income (expense) | 34,254 | 30,429 | 101,222 | 88,928 |
Noninterest income | 14,918 | 13,427 | 42,922 | 38,743 |
Income before taxes | 19,727 | 18,693 | 59,152 | 52,500 |
Total Assets | 4,360,964 |  | 4,360,964 |  | 4,379,205
Operating Segments [Member] | Other Financial Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income (expense) | 1,617 | 1,638 | 4,624 | 5,156 |
Noninterest income | 8,050 | 7,507 | 22,175 | 27,621 |
Income before taxes | 2,683 | 3,098 | 8,228 | 15,015 |
Total Assets | 95,999 |  | 95,999 |  | 128,697
Operating Segments [Member] | Executive, Operations & Support [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income (expense) | (333) | (412) | (1,006) | (1,313) |
Noninterest income | 19,025 | 17,250 | 55,501 | 55,868 |
Income before taxes | 11,964 | 9,616 | 33,711 | 34,024 |
Total Assets | 733,573 |  | 733,573 |  | 624,428
Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Noninterest income | (18,301) | (16,615) | (53,118) | (53,642) |
Income before taxes | (18,130) | $ (16,446) | (52,835) | $ (53,372) |
Total Assets | $ (758,770) |  | $ (758,770) |  | $ (717,371)

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