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Variable Interest Entities (Details) (USD $)
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3 Months Ended | 3 Months Ended | 3 Months Ended | ||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2012
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Dec. 31, 2011
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Jun. 30, 2012
Consolidated Trusts [Member]
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Dec. 31, 2011
Consolidated Trusts [Member]
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Jun. 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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Jun. 30, 2012
2009 Automobile Trust [Member]
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Dec. 31, 2011
2009 Automobile Trust [Member]
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Jun. 30, 2012
Other Consolidated Trusts [Member]
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Dec. 31, 2011
Other Consolidated Trusts [Member]
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Jun. 30, 2012
Unconsolidated Trusts [Member]
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Dec. 31, 2011
Unconsolidated Trusts [Member]
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Jun. 30, 2012
Trust Preferred Securities Total [Member]
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Dec. 31, 2011
Trust Preferred Securities Total [Member]
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Mar. 31, 2012
2012 Automobile Trust [Member]
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Jun. 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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Jun. 30, 2012
2011 Automobile Trust [Member]
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Dec. 31, 2011
2011 Automobile Trust [Member]
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Jun. 30, 2012
Tower Hill Securities [Member]
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Dec. 31, 2011
Tower Hill Securities [Member]
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Jun. 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 | $ 1,218,588,000 | $ 1,115,968,000 | $ 70,448,000 | $ 83,259,000 | $ 54,521,000 | $ 52,325,000 | $ 12,722,000 | $ 15,927,000 | $ 18,212,000 | $ 0 | $ 0 | ||||||||||||||||||
| Loans and leases | 39,959,180,000 | [1] | 38,923,783,000 | [1] | 811,768,000 | 1,132,158,000 | 601,737,000 | 704,345,000 | 131,563,000 | 210,031,000 | 296,250,000 | 0 | 0 | ||||||||||||||||
| Allowance for loan and lease losses | (859,646,000) | (964,828,000) | (4,754,000) | (7,105,000) | (4,754,000) | (5,987,000) | (1,118,000) | 0 | 0 | 0 | 0 | ||||||||||||||||||
| Net loans and leases | 39,099,534,000 | 37,958,955,000 | 807,014,000 | 1,125,053,000 | 596,983,000 | 698,358,000 | 130,445,000 | 210,031,000 | 296,250,000 | 0 | 0 | ||||||||||||||||||
| Accrued income and other assets | 2,013,230,000 | 2,168,149,000 | 3,536,000 | 6,378,000 | 2,334,000 | 2,959,000 | 610,000 | 852,000 | 1,692,000 | 350,000 | 1,117,000 | ||||||||||||||||||
| Total assets | 56,622,959,000 | 54,450,652,000 | 880,998,000 | 1,214,690,000 | 653,838,000 | 753,642,000 | 143,777,000 | 226,810,000 | 316,154,000 | 350,000 | 1,117,000 | ||||||||||||||||||
| Liabilities | |||||||||||||||||||||||||||||
| Other long term debt | 310,043,000 | [1] | 1,231,517,000 | [1] | 258,030,000 | 474,913,000 | 225,236,000 | 333,644,000 | 18,230,000 | 32,794,000 | 123,039,000 | 0 | 0 | ||||||||||||||||
| Accrued interest and other liabilities | 1,127,746,000 | 1,213,978,000 | 488,000 | 845,000 | 56,000 | 88,000 | 40,000 | 82,000 | 298,000 | 350,000 | 419,000 | ||||||||||||||||||
| Total liabilities | 50,973,728,000 | 49,032,552,000 | 258,518,000 | 475,758,000 | 225,292,000 | 333,732,000 | 18,270,000 | 32,876,000 | 123,337,000 | 350,000 | 419,000 | ||||||||||||||||||
| Carrying amount and classification of unconsolidated trusts assets and liabilities | |||||||||||||||||||||||||||||
| Total assets | 488,743,000 | 497,353,000 | 14,889,000 | 17,364,000 | 16,804,000 | 0 | 9,933,000 | 13,377,000 | 89,100,000 | 90,514,000 | 358,017,000 | 376,098,000 | |||||||||||||||||
| Total liabilities | 659,268,000 | 777,250,000 | 464,125,000 | 554,496,000 | 0 | 0 | 0 | 0 | 65,000,000 | 65,000,000 | 130,143,000 | 157,754,000 | |||||||||||||||||
| Maximum exposure to loss | 473,854,000 | 479,989,000 | 0 | 0 | 16,804,000 | 0 | 9,933,000 | 13,377,000 | 89,100,000 | 90,514,000 | 358,017,000 | 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 | 358,000,000 | 376,100,000 | |||||||||||||||||||||||||||
| Funded Commitments to limited partnership interests | 345,800,000 | 322,500,000 | |||||||||||||||||||||||||||
| Redemption of trust preferred securities | 80,000,000 | ||||||||||||||||||||||||||||
| Total of automobile loans transferred in a securitization transaction | 1,300,000,000 | 1,000,000,000 | |||||||||||||||||||||||||||
| Gain on redemption of trust preferred securities | $ 1,700,000 | ||||||||||||||||||||||||||||
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