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Variable Interest Entities (Details) (USD $)
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3 Months Ended | 9 Months Ended | 3 Months Ended | 3 Months Ended | ||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2012
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Sep. 30, 2012
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Sep. 30, 2012
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Jun. 30, 2012
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Dec. 31, 2011
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Sep. 30, 2011
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Jun. 30, 2011
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Dec. 31, 2010
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Sep. 30, 2012
Consolidated Trusts [Member]
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Dec. 31, 2011
Consolidated Trusts [Member]
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Sep. 30, 2012
2006 Automobile Trust [Member]
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Dec. 31, 2011
2006 Automobile Trust [Member]
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Dec. 31, 2011
2008 Automboile Trust [Member]
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Sep. 30, 2012
2009 Automobile Trust [Member]
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Dec. 31, 2011
2009 Automobile Trust [Member]
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Sep. 30, 2012
Other Consolidated Trusts [Member]
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Dec. 31, 2011
Other Consolidated Trusts [Member]
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Sep. 30, 2012
Unconsolidated Trusts [Member]
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Dec. 31, 2011
Unconsolidated Trusts [Member]
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Sep. 30, 2012
Trust Preferred Securities Total [Member]
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Dec. 31, 2011
Trust Preferred Securities Total [Member]
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Jun. 30, 2012
2012 Automobile Trust [Member]
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Sep. 30, 2012
2012 Automobile Trust [Member]
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Dec. 31, 2011
2012 Automobile Trust [Member]
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Sep. 30, 2011
2011 Automobile Trust [Member]
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Sep. 30, 2012
2011 Automobile Trust [Member]
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Dec. 31, 2011
2011 Automobile Trust [Member]
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Sep. 30, 2012
Tower Hill Securities [Member]
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Dec. 31, 2011
Tower Hill Securities [Member]
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Sep. 30, 2012
Low Income Housing Tax Credit Partnerships [Member]
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Dec. 31, 2011
Low Income Housing Tax Credit Partnerships [Member]
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| Assets | ||||||||||||||||||||||||||||||||||||
| Cash | $ 797,601,000 | $ 797,601,000 | $ 1,115,968,000 | $ 55,792,000 | $ 83,259,000 | $ 42,333,000 | $ 52,325,000 | $ 12,722,000 | $ 13,459,000 | $ 18,212,000 | $ 0 | $ 0 | ||||||||||||||||||||||||
| Loans and leases | 40,260,417,000 | [1] | 40,260,417,000 | [1] | 38,923,783,000 | [1] | 600,852,000 | 1,132,158,000 | 427,213,000 | 704,345,000 | 131,563,000 | 173,639,000 | 296,250,000 | 0 | 0 | |||||||||||||||||||||
| Allowance for loan and lease losses | (789,142,000) | (789,142,000) | (859,646,000) | (964,828,000) | (1,019,710,000) | (1,071,126,000) | (1,249,008,000) | (3,332,000) | (7,105,000) | (3,332,000) | (5,987,000) | (1,118,000) | 0 | 0 | 0 | 0 | ||||||||||||||||||||
| Net loans and leases | 39,471,275,000 | 39,471,275,000 | 37,958,955,000 | 597,520,000 | 1,125,053,000 | 423,881,000 | 698,358,000 | 130,445,000 | 173,639,000 | 296,250,000 | 0 | 0 | ||||||||||||||||||||||||
| Accrued income and other assets | 2,037,158,000 | 2,037,158,000 | 2,168,149,000 | 2,686,000 | 6,378,000 | 1,661,000 | 2,959,000 | 610,000 | 738,000 | 1,692,000 | 287,000 | 1,117,000 | ||||||||||||||||||||||||
| Total assets | 56,443,000,000 | 56,443,000,000 | 54,450,652,000 | 655,998,000 | 1,214,690,000 | 467,875,000 | 753,642,000 | 143,777,000 | 187,836,000 | 316,154,000 | 287,000 | 1,117,000 | ||||||||||||||||||||||||
| Liabilities | ||||||||||||||||||||||||||||||||||||
| Other long term debt | 185,613,000 | [1] | 185,613,000 | [1] | 1,231,517,000 | [1] | 28,543,000 | 474,913,000 | 28,543,000 | 333,644,000 | 18,230,000 | 0 | 123,039,000 | 0 | 0 | |||||||||||||||||||||
| Accrued interest and other liabilities | 1,133,047,000 | 1,133,047,000 | 1,213,978,000 | 293,000 | 845,000 | 6,000 | 88,000 | 40,000 | 0 | 298,000 | 287,000 | 419,000 | ||||||||||||||||||||||||
| Total liabilities | 50,635,396,000 | 50,635,396,000 | 49,032,552,000 | 28,836,000 | 475,758,000 | 28,549,000 | 333,732,000 | 18,270,000 | 0 | 123,337,000 | 287,000 | 419,000 | ||||||||||||||||||||||||
| Carrying amount and classification of unconsolidated trusts assets and liabilities | ||||||||||||||||||||||||||||||||||||
| Total assets | 499,015,000 | 497,353,000 | 14,879,000 | 17,364,000 | 14,625,000 | 0 | 8,462,000 | 13,377,000 | 89,158,000 | 90,514,000 | 371,891,000 | 376,098,000 | ||||||||||||||||||||||||
| Total liabilities | 551,395,000 | 777,250,000 | 350,009,000 | 554,496,000 | 0 | 0 | 0 | 0 | 65,000,000 | 65,000,000 | 136,386,000 | 157,754,000 | ||||||||||||||||||||||||
| Maximum exposure to loss | 484,136,000 | 479,989,000 | 0 | 0 | 14,625,000 | 0 | 8,462,000 | 13,377,000 | 89,158,000 | 90,514,000 | 371,891,000 | 376,098,000 | ||||||||||||||||||||||||
| Variable Interest Entities (Textuals) [Abstract] | ||||||||||||||||||||||||||||||||||||
| Maximum year to defer payment of interest on debenture | not exceeding five years | |||||||||||||||||||||||||||||||||||
| Commitments to limited partnership interests | 371,900,000 | 371,900,000 | 376,100,000 | |||||||||||||||||||||||||||||||||
| Funded Commitments to limited partnership interests | 361,600,000 | 361,600,000 | 322,500,000 | |||||||||||||||||||||||||||||||||
| Redemption of trust preferred securities | 36,000,000 | 194,300,000 | ||||||||||||||||||||||||||||||||||
| Total of automobile loans transferred in a securitization transaction | 1,300,000,000 | 1,000,000,000 | ||||||||||||||||||||||||||||||||||
| Gain on redemption of trust preferred securities | $ 0 | $ 800,000 | ||||||||||||||||||||||||||||||||||
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