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Business Segments - Schedule of Segment Reporting Information by Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Segment Reporting Information [Line Items]          
Interest income, including loan fees $ 65,295 $ 58,074 $ 187,573 $ 173,480  
Credit for funds provided              
Total interest income 65,295 58,074 187,573 173,480  
Interest expense 4,057 4,101 12,234 12,323  
Charge for funds used              
Total interest expense 4,057 4,101 12,234 12,323  
Net interest income 61,238 53,973 175,339 161,157  
Provision for loan losses (1,000) (3,750) (16,100) (9,950)  
Net interest income after provision for loan losses 62,238 57,723 191,439 171,107  
Noninterest income 8,009 4,957 26,557 19,397  
Noninterest expense 32,481 25,714 94,962 84,760  
Segment pre-tax profit (loss) 37,766 36,966 123,034 105,744  
Segment assets 7,422,849 6,557,283 7,422,849 6,557,283 6,664,967
Operating segments [Member] | Centers [Member]
          
Segment Reporting Information [Line Items]          
Interest income, including loan fees 36,723 36,024 105,212 106,660  
Credit for funds provided 8,190 6,782 22,924 19,603  
Total interest income 44,913 42,806 128,136 126,263  
Interest expense 1,637 1,551 4,835 4,495  
Charge for funds used 1,490 919 3,817 3,025  
Total interest expense 3,127 2,470 8,652 7,520  
Net interest income 41,786 40,336 119,484 118,743  
Provision for loan losses              
Net interest income after provision for loan losses 41,786 40,336 119,484 118,743  
Noninterest income 5,288 5,306 15,232 15,889  
Noninterest expense 12,373 11,514 35,723 34,410  
Segment pre-tax profit (loss) 34,701 34,128 98,993 100,222  
Segment assets 6,089,389 5,305,357 6,089,389 5,305,357  
Operating segments [Member] | Treasury [Member]
          
Segment Reporting Information [Line Items]          
Interest income, including loan fees 18,397 13,443 52,504 37,872  
Credit for funds provided             
Total interest income 18,397 13,443 52,504 37,872  
Interest expense 2,415 2,435 7,178 7,270  
Charge for funds used 14,374 11,595 40,607 32,973  
Total interest expense 16,789 14,030 47,785 40,243  
Net interest income 1,608 (587) 4,719 (2,371)  
Provision for loan losses              
Net interest income after provision for loan losses 1,608 (587) 4,719 (2,371)  
Noninterest income          2,094  
Noninterest expense 186 178 564 539  
Segment pre-tax profit (loss) 1,422 (765) 4,155 (816)  
Segment assets 3,431,467 2,855,964 3,431,467 2,855,964  
Operating segments [Member] | Other [Member]
          
Segment Reporting Information [Line Items]          
Interest income, including loan fees 10,175 8,607 29,857 28,948  
Credit for funds provided 12,037 10,667 34,914 31,052  
Total interest income 22,212 19,274 64,771 60,000  
Interest expense 5 115 221 558  
Charge for funds used 4,363 4,935 13,414 14,657  
Total interest expense 4,368 5,050 13,635 15,215  
Net interest income 17,844 14,224 51,136 44,785  
Provision for loan losses (1,000) (3,750) (16,100) (9,950)  
Net interest income after provision for loan losses 18,844 17,974 67,236 54,735  
Noninterest income 2,721 (349) 11,325 1,414  
Noninterest expense 19,922 14,022 58,675 49,811  
Segment pre-tax profit (loss) 1,643 3,603 19,886 6,338  
Segment assets 789,656 732,999 789,656 732,999  
Eliminations [Member]
          
Segment Reporting Information [Line Items]          
Interest income, including loan fees              
Credit for funds provided (20,227) (17,449) (57,838) (50,655)  
Total interest income (20,227) (17,449) (57,838) (50,655)  
Interest expense              
Charge for funds used (20,227) (17,449) (57,838) (50,655)  
Total interest expense (20,227) (17,449) (57,838) (50,655)  
Net interest income              
Provision for loan losses              
Net interest income after provision for loan losses              
Noninterest income              
Noninterest expense              
Segment pre-tax profit (loss)              
Segment assets $ (2,887,663) $ (2,337,037) $ (2,887,663) $ (2,337,037)