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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
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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)

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