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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, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]                      
Interest income, including loan fees                 $ 232,773 $ 262,222 $ 269,720
Credit for funds provided                         
Total interest income                 232,773 262,222 269,720
Interest expense                 16,507 25,272 35,039
Charge for funds used                         
Total interest expense                 16,507 25,272 35,039
Net interest income 55,109 53,973 52,595 54,589 55,644 59,744 462,960 58,602 216,266 236,950 234,681
Provision for loan losses (6,800) (3,750) (6,200)               (16,750)    7,068
Net interest income after provision for loan losses                 233,016 236,950 227,613
Noninterest income                 25,287 15,903 34,216
Noninterest expense                 114,028 138,160 141,025
Debt termination                    20,379 3,310
Earnings before income taxes                 144,275 114,693 120,804
Segment assets 6,664,967       6,363,364       6,664,967 6,363,364 6,482,915
Operating segments [Member] | Centers [Member]
                      
Segment Reporting Information [Line Items]                      
Interest income, including loan fees                 141,177 150,071 157,376
Credit for funds provided                 26,754 25,764 24,811
Total interest income                 167,931 175,835 182,187
Interest expense                 6,138 7,162 10,411
Charge for funds used                 3,874 4,142 4,884
Total interest expense                 10,012 11,304 15,295
Net interest income                 157,919 164,531 166,892
Provision for loan losses                         
Net interest income after provision for loan losses                 157,919 164,531 166,892
Noninterest income                 20,907 23,020 21,622
Noninterest expense                 45,831 45,189 49,802
Debt termination                         
Earnings before income taxes                 132,995 142,362 138,712
Segment assets 5,407,434       5,198,393       5,407,434 5,198,393 5,003,093
Operating segments [Member] | Treasury [Member]
                      
Segment Reporting Information [Line Items]                      
Interest income, including loan fees                 53,234 56,559 62,732
Credit for funds provided                         
Total interest income                 53,234 56,559 62,732
Interest expense                 9,700 15,396 21,258
Charge for funds used                 45,269 41,270 35,128
Total interest expense                 54,969 56,666 56,386
Net interest income                 (1,735) (107) 6,346
Provision for loan losses                         
Net interest income after provision for loan losses                 (1,735) (107) 6,346
Noninterest income                 2,094    (655)
Noninterest expense                 714 729 4,117
Debt termination                    20,379   
Earnings before income taxes                 (355) (21,215) 1,574
Segment assets 2,866,760       2,642,445       2,866,760 2,642,445 2,650,201
Operating segments [Member] | Other [Member]
                      
Segment Reporting Information [Line Items]                      
Interest income, including loan fees                 38,362 55,592 49,612
Credit for funds provided                 41,987 31,505 39,621
Total interest income                 80,349 87,097 89,233
Interest expense                 670 2,714 3,370
Charge for funds used                 19,598 11,857 24,420
Total interest expense                 20,268 14,571 27,790
Net interest income                 60,081 72,526 61,443
Provision for loan losses                 (16,750)    7,068
Net interest income after provision for loan losses                 76,831 72,526 54,375
Noninterest income                 2,286 (7,117) 13,249
Noninterest expense                 67,483 71,863 87,106
Debt termination                         
Earnings before income taxes                 11,634 (6,454) (19,482)
Segment assets 709,348       635,827       709,348 635,827 689,710
Eliminations [Member]
                      
Segment Reporting Information [Line Items]                      
Interest income, including loan fees                         
Credit for funds provided                 (68,741) (57,269) (64,432)
Total interest income                 (68,741) (57,269) (64,432)
Interest expense                         
Charge for funds used                 (68,741) (57,269) (64,432)
Total interest expense                 (68,741) (57,269) (64,432)
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 $ (2,318,576)       $ (2,113,301)       $ (2,318,576) $ (2,113,301) $ (1,860,089)