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Business Segments - Schedule of Segment Reporting Information by Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Operating Statistics [Line Items]          
Interest income, including loan fees $ 56,593 $ 70,179 $ 115,406 $ 136,244  
Total interest income 56,593 70,179 115,406 136,244  
Interest expense 3,998 7,219 8,222 14,682  
Total interest expense 3,998 7,219 8,222 14,682  
Net interest income 52,595 62,960 107,184 121,562  
Provision for loan losses (6,200)    (6,200)     
Net interest income after provision for loan losses 58,795 62,960 113,384 121,562  
Noninterest income 7,695 2,292 14,440 7,548  
Noninterest expense 28,248 28,949 59,046 59,161  
Debt termination              
Earnings before income taxes 38,242 36,303 68,778 69,949  
Segment assets 6,425,556 6,523,963 6,425,556 6,523,963 6,363,364
Operating Segments [Member] | Centers [Member]
          
Operating Statistics [Line Items]          
Interest income, including loan fees 35,201 37,573 70,636 75,244  
Credit for funds provided 6,509 6,277 12,821 12,624  
Total interest income 41,710 43,850 83,457 87,868  
Interest expense 1,445 1,865 2,944 3,916  
Charge for funds used 1,033 1,044 2,106 2,141  
Total interest expense 2,478 2,909 5,050 6,057  
Net interest income 39,232 40,941 78,407 81,811  
Provision for loan losses            
Net interest income after provision for loan losses 39,232 40,941 78,407 81,811  
Noninterest income 5,477 5,807 10,583 11,790  
Noninterest expense 11,319 11,297 22,896 23,195  
Debt termination              
Earnings before income taxes 33,390 35,451 66,094 70,406  
Segment assets 5,146,329 4,869,845 5,146,329 4,869,845  
Operating Segments [Member] | Treasury [Member]
          
Operating Statistics [Line Items]          
Interest income, including loan fees 11,641 14,983 24,429 30,346  
Total interest income 11,641 14,983 24,429 30,346  
Interest expense 2,418 4,569 4,835 9,117  
Charge for funds used 10,864 10,098 21,378 20,126  
Total interest expense 13,282 14,667 26,213 29,243  
Net interest income (1,641) 316 (1,784) 1,103  
Provision for loan losses            
Net interest income after provision for loan losses (1,641) 316 (1,784) 1,103  
Noninterest income     2,094    
Noninterest expense 177 186 361 381  
Debt termination              
Earnings before income taxes (1,818) 130 (51) 722  
Segment assets 2,826,947 2,832,792 2,826,947 2,832,792  
Operating Segments [Member] | Other [Member]
          
Operating Statistics [Line Items]          
Interest income, including loan fees 9,751 17,623 20,341 30,654  
Credit for funds provided 2,309 2,550 4,868 5,150  
Total interest income 12,060 20,173 25,209 35,804  
Interest expense 135 785 443 1,649  
Charge for funds used (3,079) (2,315) (5,795) (4,493)  
Total interest expense (2,944) (1,530) (5,352) (2,844)  
Net interest income 15,004 21,703 30,561 38,648  
Provision for loan losses (6,200)    (6,200)     
Net interest income after provision for loan losses 21,204 21,703 36,761 38,648  
Noninterest income 2,218 (3,515) 1,763 (4,242)  
Noninterest expense 16,752 17,466 35,789 35,585  
Debt termination              
Earnings before income taxes 6,670 722 2,735 (1,179)  
Segment assets 746,429 895,925 746,429 895,925  
Eliminations [Member]
          
Operating Statistics [Line Items]          
Credit for funds provided (8,818) (8,827) (17,689) (17,774)  
Total interest income (8,818) (8,827) (17,689) (17,774)  
Charge for funds used (8,818) (8,827) (17,689) (17,774)  
Total interest expense (8,818) (8,827) (17,689) (17,774)  
Provision for loan losses            
Debt termination              
Segment assets $ (2,294,149) $ (2,074,599) $ (2,294,149) $ (2,074,599)