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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)