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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Segment Reporting Information [Line Items]          
Interest income, including loan fees $ 65,171 $ 67,731 $ 197,686 $ 196,426  
Credit for funds provided 0 0 0 0  
Total interest income 65,171 67,731 197,686 196,426  
Interest expense 2,010 1,814 6,053 6,742  
Charge for funds used 0 0 0 0  
Total interest expense 2,010 1,814 6,053 6,742  
Net interest income 63,161 65,917 191,633 189,684  
Recapture of provision for loan losses (2,000) (2,500) (2,000) (4,500)  
Net interest income after recapture of provision for loan losses 65,161 68,417 193,633 194,184  
Noninterest income 9,183 8,413 27,140 24,769  
Noninterest expense 33,006 32,742 101,792 94,877  
Debt termination expense     16 13,870  
Earnings before income taxes 41,338 44,088 118,965 110,206  
Segment assets 8,044,993 7,626,462 8,044,993 7,626,462 $ 7,671,200
Operating Segments [Member] | Centers [Member]          
Segment Reporting Information [Line Items]          
Interest income, including loan fees 39,034 36,998 114,491 108,179  
Credit for funds provided 9,576 8,977 27,093 25,718  
Total interest income 48,610 45,975 141,584 133,897  
Interest expense 1,750 1,654 5,153 4,945  
Charge for funds used 1,361 1,088 4,115 3,207  
Total interest expense 3,111 2,742 9,268 8,152  
Net interest income 45,499 43,233 132,316 125,745  
Recapture of provision for loan losses 0 0 0 0  
Net interest income after recapture of provision for loan losses 45,499 43,233 132,316 125,745  
Noninterest income 5,182 5,276 15,335 15,662  
Noninterest expense 12,423 12,496 37,924 36,604  
Debt termination expense     0 0  
Earnings before income taxes 38,258 36,013 109,727 104,803  
Segment assets 6,963,530 6,419,264 6,963,530 6,419,264  
Operating Segments [Member] | Treasury [Member]          
Segment Reporting Information [Line Items]          
Interest income, including loan fees 17,439 18,927 53,975 56,792  
Credit for funds provided 0 0 0 0  
Total interest income 17,439 18,927 53,975 56,792  
Interest expense 123 58 510 1,520  
Charge for funds used 17,153 15,983 48,131 46,230  
Total interest expense 17,276 16,041 48,641 47,750  
Net interest income 163 2,886 5,334 9,042  
Recapture of provision for loan losses 0 0 0 0  
Net interest income after recapture of provision for loan losses 163 2,886 5,334 9,042  
Noninterest income 548 (22) 548 (22)  
Noninterest expense 218 219 652 643  
Debt termination expense     16 13,870  
Earnings before income taxes 493 2,645 5,214 (5,493)  
Segment assets 3,424,605 3,505,392 3,424,605 3,505,392  
Operating Segments [Member] | Other [Member]          
Segment Reporting Information [Line Items]          
Interest income, including loan fees 8,698 11,806 29,220 31,455  
Credit for funds provided 14,586 13,249 42,271 38,914  
Total interest income 23,284 25,055 71,491 70,369  
Interest expense 137 102 390 277  
Charge for funds used 5,648 5,155 17,118 15,195  
Total interest expense 5,785 5,257 17,508 15,472  
Net interest income 17,499 19,798 53,983 54,897  
Recapture of provision for loan losses (2,000) (2,500) (2,000) (4,500)  
Net interest income after recapture of provision for loan losses 19,499 22,298 55,983 59,397  
Noninterest income 3,453 3,159 11,257 9,129  
Noninterest expense 20,365 20,027 63,216 57,630  
Debt termination expense     0 0  
Earnings before income taxes 2,587 5,430 4,024 10,896  
Segment assets 906,344 809,514 906,344 809,514  
Eliminations [Member]          
Segment Reporting Information [Line Items]          
Interest income, including loan fees 0 0 0 0  
Credit for funds provided (24,162) (22,226) (69,364) (64,632)  
Total interest income (24,162) (22,226) (69,364) (64,632)  
Interest expense 0 0 0 0  
Charge for funds used (24,162) (22,226) (69,364) (64,632)  
Total interest expense (24,162) (22,226) (69,364) (64,632)  
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  
Earnings before income taxes 0 0 0 0  
Segment assets $ (3,249,486) $ (3,107,708) $ (3,249,486) $ (3,107,708)