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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)