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Business Segments - Schedule of Segment Reporting Information by Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Segment Reporting Information [Line Items]      
Interest income, including loan fees $ 61,062 $ 58,813  
Total interest income 61,062 58,813  
Interest expense 4,120 4,224  
Total interest expense 4,120 4,224  
Net interest income 56,942 54,589  
Provision for loan losses (7,500)     
Net interest income after provision for loan losses 64,442 54,589  
Noninterest income 11,498 6,745  
Noninterest expense 31,157 30,798  
Segment pre-tax profit (loss) 44,783 30,536  
Segment assets 6,902,518 6,265,767 6,664,967
Operating segments [Member] | Centers [Member]
      
Segment Reporting Information [Line Items]      
Interest income, including loan fees 33,091 35,435  
Credit for funds provided 7,074 6,312  
Total interest income 40,165 41,747  
Interest expense 1,637 1,499  
Charge for funds used 1,090 1,073  
Total interest expense 2,727 2,572  
Net interest income 37,438 39,175  
Provision for loan losses       
Net interest income after provision for loan losses 37,438 39,175  
Noninterest income 4,782 5,106  
Noninterest expense 11,828 11,577  
Segment pre-tax profit (loss) 30,392 32,704  
Segment assets 5,525,494 4,985,725  
Operating segments [Member] | Treasury [Member]
      
Segment Reporting Information [Line Items]      
Interest income, including loan fees 16,432 12,788  
Total interest income 16,432 12,788  
Interest expense 2,373 2,417  
Charge for funds used 12,797 10,514  
Total interest expense 15,170 12,931  
Net interest income 1,262 (143)  
Provision for loan losses       
Net interest income after provision for loan losses 1,262 (143)  
Noninterest income   2,094  
Noninterest expense 196 184  
Segment pre-tax profit (loss) 1,066 1,767  
Segment assets 3,264,736 2,622,402  
Operating segments [Member] | Other [Member]
      
Segment Reporting Information [Line Items]      
Interest income, including loan fees 11,539 10,590  
Credit for funds provided 11,463 2,559  
Total interest income 23,002 13,149  
Interest expense 110 308  
Charge for funds used 4,650 (2,716)  
Total interest expense 4,760 (2,408)  
Net interest income 18,242 15,557  
Provision for loan losses (7,500)     
Net interest income after provision for loan losses 25,742 15,557  
Noninterest income 6,716 (455)  
Noninterest expense 19,133 19,037  
Segment pre-tax profit (loss) 13,325 (3,935)  
Segment assets 843,026 788,016  
Eliminations [Member]
      
Segment Reporting Information [Line Items]      
Credit for funds provided (18,537) (8,871)  
Total interest income (18,537) (8,871)  
Charge for funds used (18,537) (8,871)  
Total interest expense (18,537) (8,871)  
Provision for loan losses       
Segment assets $ (2,730,738) $ (2,130,376)