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Business Segments - Schedule of Segment Reporting Information by Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Segment Reporting Information [Line Items]          
Interest income, including loan fees $ 67,731 $ 65,295 $ 196,426 $ 187,573  
Credit for funds provided 0 0 0 0  
Total interest income 67,731 65,295 196,426 187,573  
Interest expense 1,814 4,057 6,742 12,234  
Charge for funds used 0 0 0 0  
Total interest expense 1,814 4,057 6,742 12,234  
Net interest income 65,917 61,238 189,684 175,339  
(Recapture of) Provision for Loan Losses (2,500) (1,000) (4,500) (16,100)  
Net interest income after recapture of provision for loan losses 68,417 62,238 194,184 191,439  
Noninterest income 8,413 8,009 24,769 26,557  
Noninterest expense 32,742 32,481 94,877 94,962  
Debt termination expense 0 0 13,870 0  
Earnings before income taxes 44,088 37,766 110,206 123,034  
Segment assets 7,626,462 7,422,849 7,626,462 7,422,849 $ 7,377,920
Operating Segments [Member] | Centers [Member]          
Segment Reporting Information [Line Items]          
Interest income, including loan fees 36,998 35,384 108,179 103,158  
Credit for funds provided 8,977 8,190 25,718 22,924  
Total interest income 45,975 43,574 133,897 126,082  
Interest expense 1,654 1,637 4,945 4,835  
Charge for funds used 1,088 1,061 3,207 2,978  
Total interest expense 2,742 2,698 8,152 7,813  
Net interest income 43,233 40,876 125,745 118,269  
(Recapture of) Provision for Loan Losses 0 0 0 0  
Net interest income after recapture of provision for loan losses 43,233 40,876 125,745 118,269  
Noninterest income 5,276 5,288 15,662 15,232  
Noninterest expense 12,496 12,221 36,604 35,469  
Debt termination expense 0 0 0 0  
Earnings before income taxes 36,013 33,943 104,803 98,032  
Segment assets 6,419,264 6,086,641 6,419,264 6,086,641  
Operating Segments [Member] | Treasury [Member]          
Segment Reporting Information [Line Items]          
Interest income, including loan fees 18,927 18,397 56,792 52,504  
Credit for funds provided 0 0 0 0  
Total interest income 18,927 18,397 56,792 52,504  
Interest expense 58 2,415 1,520 7,178  
Charge for funds used 15,983 14,374 46,230 40,607  
Total interest expense 16,041 16,789 47,750 47,785  
Net interest income 2,886 1,608 9,042 4,719  
(Recapture of) Provision for Loan Losses 0 0 0 0  
Net interest income after recapture of provision for loan losses 2,886 1,608 9,042 4,719  
Noninterest income (22) 0 (22) 0  
Noninterest expense 219 186 643 564  
Debt termination expense 0 0 13,870 0  
Earnings before income taxes 2,645 1,422 (5,493) 4,155  
Segment assets 3,505,392 3,431,467 3,505,392 3,431,467  
Operating Segments [Member] | Other [Member]          
Segment Reporting Information [Line Items]          
Interest income, including loan fees 11,806 11,514 31,455 31,911  
Credit for funds provided 13,249 12,037 38,914 34,914  
Total interest income 25,055 23,551 70,369 66,825  
Interest expense 102 5 277 221  
Charge for funds used 5,155 4,792 15,195 14,253  
Total interest expense 5,257 4,797 15,472 14,474  
Net interest income 19,798 18,754 54,897 52,351  
(Recapture of) Provision for Loan Losses (2,500) (1,000) (4,500) (16,100)  
Net interest income after recapture of provision for loan losses 22,298 19,754 59,397 68,451  
Noninterest income 3,159 2,721 9,129 11,325  
Noninterest expense 20,027 20,074 57,630 58,929  
Debt termination expense 0 0 0 0  
Earnings before income taxes 5,430 2,401 10,896 20,847  
Segment assets 809,514 792,404 809,514 792,404  
Eliminations [Member]          
Segment Reporting Information [Line Items]          
Interest income, including loan fees 0 0 0 0  
Credit for funds provided (22,226) (20,227) (64,632) (57,838)  
Total interest income (22,226) (20,227) (64,632) (57,838)  
Interest expense 0 0 0 0  
Charge for funds used (22,226) (20,227) (64,632) (57,838)  
Total interest expense (22,226) (20,227) (64,632) (57,838)  
Net interest income 0 0 0 0  
(Recapture of) Provision for Loan Losses 0 0 0 0  
Net interest income after recapture of provision for loan losses 0 0 0 0  
Noninterest income 0 0 0 0  
Noninterest expense 0 0 0 0  
Debt termination expense 0 0 0 0  
Earnings before income taxes 0 0 0 0  
Segment assets $ (3,107,708) $ (2,887,663) $ (3,107,708) $ (2,887,663)