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Business Segments - Schedule of Segment Reporting Information by Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]                      
Interest income, including loan fees                 $ 261,513 $ 252,903 $ 232,773
Credit for funds provided                 0 0 0
Total interest income                 261,513 252,903 232,773
Interest expense                 8,571 16,389 16,507
Charge for funds used                 0 0 0
Total interest expense                 8,571 16,389 16,507
Net interest income $ 63,258 $ 65,917 $ 62,758 $ 61,009 $ 61,175 $ 61,238 $ 57,159 $ 56,942 252,942 236,514 216,266
(Recapture of) Provision for Loan Losses (1,100) $ (2,500) $ (2,000) $ 0 0 $ (1,000) $ (7,600) $ (7,500) (5,600) (16,100) (16,750)
Net interest income after recapture of provision for loan losses                 258,542 252,614 233,016
Noninterest income                 33,483 36,412 25,287
Noninterest expense                 126,789 126,229 114,028
Debt termination expense                 13,870 0 0
Earnings before income taxes                 151,366 162,797 144,275
Segment assets 7,671,200       7,377,920       7,671,200 7,377,920 6,664,967
Operating Segments [Member] | Centers [Member]                      
Segment Reporting Information [Line Items]                      
Interest income, including loan fees                 143,577 139,061 139,369
Credit for funds provided                 34,876 31,188 26,754
Total interest income                 178,453 170,249 166,123
Interest expense                 6,584 6,494 6,137
Charge for funds used                 4,236 3,823 3,193
Total interest expense                 10,820 10,317 9,330
Net interest income                 167,633 159,932 156,793
(Recapture of) Provision for Loan Losses                 0 0 0
Net interest income after recapture of provision for loan losses                 167,633 159,932 156,793
Noninterest income                 20,677 20,513 20,733
Noninterest expense                 48,568 47,493 45,268
Debt termination expense                 0 0 0
Earnings before income taxes                 139,742 132,952 132,258
Segment assets 6,458,711       6,002,390       6,458,711 6,002,390 5,405,939
Operating Segments [Member] | Treasury [Member]                      
Segment Reporting Information [Line Items]                      
Interest income, including loan fees                 75,914 71,369 53,234
Credit for funds provided                 0 0 0
Total interest income                 75,914 71,369 53,234
Interest expense                 1,611 9,590 9,700
Charge for funds used                 62,137 54,885 45,269
Total interest expense                 63,748 64,475 54,969
Net interest income                 12,166 6,894 (1,735)
(Recapture of) Provision for Loan Losses                 0 0 0
Net interest income after recapture of provision for loan losses                 12,166 6,894 (1,735)
Noninterest income                 (22) 0 2,094
Noninterest expense                 859 784 714
Debt termination expense                 13,870 0 0
Earnings before income taxes                 (2,585) 6,110 (355)
Segment assets 3,345,060       3,268,551       3,345,060 3,268,551 2,866,760
Operating Segments [Member] | Other [Member]                      
Segment Reporting Information [Line Items]                      
Interest income, including loan fees                 42,022 42,473 40,170
Credit for funds provided                 52,193 46,770 41,987
Total interest income                 94,215 89,243 82,157
Interest expense                 376 305 670
Charge for funds used                 20,696 19,250 20,279
Total interest expense                 21,072 19,555 20,949
Net interest income                 73,143 69,688 61,208
(Recapture of) Provision for Loan Losses                 (5,600) (16,100) (16,750)
Net interest income after recapture of provision for loan losses                 78,743 85,788 77,958
Noninterest income                 12,828 15,899 2,460
Noninterest expense                 77,362 77,952 68,046
Debt termination expense                 0 0 0
Earnings before income taxes                 14,209 23,735 12,372
Segment assets 804,258       757,093       804,258 757,093 710,844
Eliminations [Member]                      
Segment Reporting Information [Line Items]                      
Interest income, including loan fees                 0 0 0
Credit for funds provided                 (87,069) (77,958) (68,741)
Total interest income                 (87,069) (77,958) (68,741)
Interest expense                 0 0 0
Charge for funds used                 (87,069) (77,958) (68,741)
Total interest expense                 (87,069) (77,958) (68,741)
Net interest income                 0 0 0
(Recapture of) Provision for Loan Losses                 0 0 0
Net interest income after recapture of provision for loan losses                 0 0 0
Noninterest income                 0 0 0
Noninterest expense                 0 0 0
Debt termination expense                 0 0 0
Earnings before income taxes                 0 0 0
Segment assets $ (2,936,829)       $ (2,650,114)       $ (2,936,829) $ (2,650,114) $ (2,318,576)