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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, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Operating Statistics [Line Items]          
Interest income, including loan fees $ 58,074 $ 65,845 $ 173,480 $ 202,089  
Credit for funds provided             
Total interest income 58,074 65,845 173,480 202,089  
Interest expense 4,101 6,101 12,323 20,783  
Charge for funds used           
Total interest expense 4,101 6,101 12,323 20,783  
Net interest income 53,973 59,744 161,157 181,306  
Provision for loan losses (3,750)   (9,950)    
Net interest income after provision for loan losses 57,723 59,744 171,107 181,306  
Noninterest income 4,957 2,626 19,397 10,174  
Noninterest expense 25,714 50,020 84,760 109,181  
Debt termination   20,379   20,379  
Earnings before income taxes 36,966 12,350 105,744 82,299  
Segment assets 6,557,283 6,321,341 6,557,283 6,321,341 6,363,364
Operating Segments [Member] | Centers [Member]
          
Operating Statistics [Line Items]          
Interest income, including loan fees 36,024 38,122 106,660 113,366  
Credit for funds provided 6,782 6,403 19,603 19,027  
Total interest income 42,806 44,525 126,263 132,393  
Interest expense 1,551 1,665 4,495 5,581  
Charge for funds used 919 992 3,025 3,133  
Total interest expense 2,470 2,657 7,520 8,714  
Net interest income 40,336 41,868 118,743 123,679  
Provision for loan losses             
Net interest income after provision for loan losses 40,336 41,868 118,743 123,679  
Noninterest income 5,306 5,798 15,889 17,588  
Noninterest expense 11,514 10,874 34,410 34,069  
Debt termination           
Earnings before income taxes 34,128 36,792 100,222 107,198  
Segment assets 5,305,357 5,084,218 5,305,357 5,084,218  
Operating Segments [Member] | Treasury [Member]
          
Operating Statistics [Line Items]          
Interest income, including loan fees 13,443 13,263 37,872 43,609  
Credit for funds provided             
Total interest income 13,443 13,263 37,872 43,609  
Interest expense 2,435 3,819 7,270 12,936  
Charge for funds used 11,595 10,309 32,973 30,435  
Total interest expense 14,030 14,128 40,243 43,371  
Net interest income (587) (865) (2,371) 238  
Provision for loan losses            
Net interest income after provision for loan losses (587) (865) (2,371) 238  
Noninterest income      2,094    
Noninterest expense 178 176 539 557  
Debt termination   20,379    20,379  
Earnings before income taxes (765) (21,420) (816) (20,698)  
Segment assets 2,855,964 2,604,648 2,855,964 2,604,648  
Operating Segments [Member] | Other [Member]
          
Operating Statistics [Line Items]          
Interest income, including loan fees 8,607 14,460 28,948 45,114  
Credit for funds provided 2,617 2,608 7,485 7,758  
Total interest income 11,224 17,068 36,433 52,872  
Interest expense 115 617 558 2,266  
Charge for funds used (3,115) (2,290) (8,910) (6,783)  
Total interest expense (3,000) (1,673) (8,352) (4,517)  
Net interest income 14,224 18,741 44,785 57,389  
Provision for loan losses (3,750)    (9,950)    
Net interest income after provision for loan losses 17,974 18,741 54,735 57,389  
Noninterest income (349) (3,172) 1,414 (7,414)  
Noninterest expense 14,022 18,591 49,811 54,176  
Debt termination           
Earnings before income taxes 3,603 (3,022) 6,338 (4,201)  
Segment assets 732,999 739,153 732,999 739,153  
Eliminations [Member]
          
Operating Statistics [Line Items]          
Interest income, including loan fees             
Credit for funds provided (9,399) (9,011) (27,088) (26,785)  
Total interest income (9,399) (9,011) (27,088) (26,785)  
Interest expense            
Charge for funds used (9,399) (9,011) (27,088) (26,785)  
Total interest expense (9,399) (9,011) (27,088) (26,785)  
Net interest income             
Provision for loan losses             
Net interest income after provision for loan losses             
Noninterest income             
Noninterest expense             
Debt termination            
Earnings before income taxes             
Segment assets $ (2,337,037) $ (2,106,678) $ (2,337,037) $ (2,106,678)