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Business Segments - Schedule of Segment Reporting Information by Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating Statistics [Line Items]                      
Interest income, including loan fees                 $ 262,222 $ 269,720 $ 317,289
Credit for funds provided                        
Total interest income                 262,222 269,720 317,289
Interest expense                 25,272 35,039 57,972
Charge for funds used                        
Total interest expense                 25,272 35,039 57,972
Net interest income 55,644 59,744 62,960 58,602 55,197 55,980 62,395 57,109 236,950 234,681 259,317
Provision for credit losses                      7,068   7,068 61,200
Net interest income after provision for credit losses                 236,950 227,613 198,117
Noninterest income                 15,903 34,216 57,114
Noninterest expense                 138,160 141,025 168,492
Debt termination                 20,379 3,310 18,663
Earnings before income taxes                 114,693 120,804 86,739
Segment assets 6,363,364       6,482,915       6,363,364 6,482,915 6,436,691
Centers [Member]
                      
Operating Statistics [Line Items]                      
Interest income, including loan fees                 150,071 157,376 170,335
Credit for funds provided                 25,764 24,811 71,752
Total interest income                 175,835 182,187 242,087
Interest expense                 7,162 10,411 22,438
Charge for funds used                 4,142 4,884 11,743
Total interest expense                 11,304 15,295 34,181
Net interest income                 164,531 166,892 207,906
Provision for credit losses                       
Net interest income after provision for credit losses                 164,531 166,892 207,906
Noninterest income                 23,020 21,622 23,204
Noninterest expense                 45,189 49,802 51,922
Earnings before income taxes                 142,362 138,712 179,188
Segment assets 5,198,393       5,003,093       5,198,393 5,003,093 4,941,548
Treasury [Member]
                      
Operating Statistics [Line Items]                      
Interest income, including loan fees                 56,559 62,732 76,651
Credit for funds provided                        
Total interest income                 56,559 62,732 76,651
Interest expense                 15,396 21,258 32,302
Charge for funds used                 41,270 35,128 41,484
Total interest expense                 56,666 56,386 73,786
Net interest income                 (107) 6,346 2,865
Provision for credit losses                       
Net interest income after provision for credit losses                 (107) 6,346 2,865
Noninterest income                   (655) 37,997
Noninterest expense                 729 4,117 20,125
Debt termination                 20,379    
Earnings before income taxes                 (21,215) 1,574 20,737
Segment assets 2,642,445       2,650,201       2,642,445 2,650,201 2,329,344
Other [Member]
                      
Operating Statistics [Line Items]                      
Interest income, including loan fees                 55,592 49,612 70,303
Credit for funds provided                 31,505 39,621 28,965
Total interest income                 87,097 89,233 99,268
Interest expense                 2,714 3,370 3,232
Charge for funds used                 11,857 24,420 47,490
Total interest expense                 14,571 27,790 50,722
Net interest income                 72,526 61,443 48,546
Provision for credit losses                   7,068 61,200
Net interest income after provision for credit losses                 72,526 54,375 (12,654)
Noninterest income                 (7,117) 13,249 (4,087)
Noninterest expense                 71,863 87,106 96,445
Earnings before income taxes                 (6,454) (19,482) (113,186)
Segment assets 635,827       689,710       635,827 689,710 630,451
Eliminations [Member]
                      
Operating Statistics [Line Items]                      
Interest income, including loan fees                        
Credit for funds provided                 (57,269) (64,432) (100,717)
Total interest income                 (57,269) (64,432) (100,717)
Interest expense                        
Charge for funds used                 (57,269) (64,432) (100,717)
Total interest expense                 (57,269) (64,432) (100,717)
Net interest income                        
Provision for credit losses                        
Net interest income after provision for credit losses                        
Noninterest income                        
Noninterest expense                        
Earnings before income taxes                        
Segment assets $ (2,113,301)       $ (1,860,089)       $ (2,113,301) $ (1,860,089) $ (1,464,652)