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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]                      
Net interest income (expense) $ 51,553 $ 51,431 $ 50,868 $ 49,976 $ 50,075 $ 46,876 $ 46,215 $ 45,626 $ 203,828 $ 188,792 $ 181,351
Provision for loan losses 1,672 2,940 2,804 4,103 3,646 1,424 1,271 1,334 11,519 7,675 3,072
Noninterest income 27,431 $ 27,927 $ 26,057 $ 25,617 26,473 $ 25,324 $ 28,715 $ 25,296 107,032 105,808 96,413
Depreciation and amortization                 12,383 11,901 11,349
Other expenses                 179,021 173,814 172,172
Income before taxes                 107,937 101,210 91,171
Total assets 7,018,952       6,692,829       7,018,952 6,692,829 6,574,972
Capital expenditures                 10,835 11,263 11,490
Operating Segments [Member] | Metropolitan Banks [Member]                      
Segment Reporting Information [Line Items]                      
Net interest income (expense)                 63,519 61,500 59,923
Provision for loan losses                 2,229 2,684 3,077
Noninterest income                 16,372 16,552 13,752
Depreciation and amortization                 2,341 2,273 2,216
Other expenses                 34,130 32,942 32,300
Income before taxes                 41,191 40,153 36,082
Total assets 2,493,096       2,277,870       2,493,096 2,277,870 2,298,828
Capital expenditures                 1,525 3,743 1,948
Operating Segments [Member] | Community Banks [Member]                      
Segment Reporting Information [Line Items]                      
Net interest income (expense)                 135,508 122,404 116,935
Provision for loan losses                 7,509 3,806 (488)
Noninterest income                 57,745 52,598 51,415
Depreciation and amortization                 8,281 7,894 7,277
Other expenses                 96,627 91,655 89,888
Income before taxes                 80,836 71,647 71,673
Total assets 4,412,174       4,379,205       4,412,174 4,379,205 4,113,783
Capital expenditures                 7,738 4,634 7,972
Operating Segments [Member] | Other Financial Services [Member]                      
Segment Reporting Information [Line Items]                      
Net interest income (expense)                 6,132 6,798 6,155
Provision for loan losses                 1,653 1,176 481
Noninterest income                 29,711 33,629 28,079
Depreciation and amortization                 510 514 522
Other expenses                 22,216 22,308 22,304
Income before taxes                 11,464 16,429 10,927
Total assets 83,594       128,697       83,594 128,697 145,814
Capital expenditures                 125 121 121
Operating Segments [Member] | Executive, Operations & Support [Member]                      
Segment Reporting Information [Line Items]                      
Net interest income (expense)                 (1,331) (1,910) (1,662)
Provision for loan losses                 128 9 2
Noninterest income                 75,415 72,806 69,442
Depreciation and amortization                 1,251 1,220 1,334
Other expenses                 26,375 27,221 27,998
Income before taxes                 46,330 42,446 38,446
Total assets 803,810       624,428       803,810 624,428 679,194
Capital expenditures                 1,447 2,765 1,449
Eliminations [Member]                      
Segment Reporting Information [Line Items]                      
Noninterest income                 (72,211) (69,777) (66,275)
Other expenses                 (327) (312) (318)
Income before taxes                 (71,884) (69,465) (65,957)
Total assets $ (773,722)       $ (717,371)       $ (773,722) $ (717,371) $ (662,647)