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Variable Interest Entities (Consolidated and Unconsolidated) (Details) (USD $)
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3 Months Ended | 9 Months Ended | 3 Months Ended | 12 Months Ended | ||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Mar. 31, 2014
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Dec. 31, 2013
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Jun. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2012
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Mar. 31, 2014
Consolidated Trusts [Member]
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Dec. 31, 2013
Consolidated Trusts [Member]
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Mar. 31, 2014
2006 Automobile Trust [Member]
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Dec. 31, 2013
2006 Automobile Trust [Member]
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Mar. 31, 2014
2009 Automobile Trust [Member]
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Dec. 31, 2013
2009 Automobile Trust [Member]
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Mar. 31, 2014
Franklin 2009 Trust [Member]
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Dec. 31, 2013
Franklin 2009 Trust [Member]
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Mar. 31, 2014
Unconsolidated Trusts [Member]
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Dec. 31, 2013
Unconsolidated Trusts [Member]
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Mar. 31, 2014
Trust Preferred Securities Total [Member]
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Dec. 31, 2013
Trust Preferred Securities Total [Member]
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Mar. 31, 2014
2012-2 Automobile Trust [Member]
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Dec. 31, 2013
2012-2 Automobile Trust [Member]
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Mar. 31, 2014
2012-1 Automobile Trust [Member]
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Dec. 31, 2013
2012-1 Automobile Trust [Member]
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Mar. 31, 2014
2011 Automobile Trust [Member]
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Dec. 31, 2013
2011 Automobile Trust [Member]
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Mar. 31, 2014
Tower Hill Securities [Member]
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Dec. 31, 2013
Tower Hill Securities [Member]
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Mar. 31, 2014
Low Income Housing Tax Credit Partnerships [Member]
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Mar. 31, 2013
Low Income Housing Tax Credit Partnerships [Member]
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Dec. 31, 2013
Low Income Housing Tax Credit Partnerships [Member]
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| Assets | ||||||||||||||||||||||||||||||
| Cash | $ 973,264,000 | $ 1,001,132,000 | $ 0 | $ 87,733,000 | $ 0 | $ 79,153,000 | $ 0 | $ 8,580,000 | $ 0 | $ 0 | ||||||||||||||||||||
| Loans and leases | 44,353,908,000 | 43,120,500,000 | 0 | 203,457,000 | 0 | 151,171,000 | 0 | 52,286,000 | 0 | 0 | ||||||||||||||||||||
| Allowance for loan and lease losses | (631,918,000) | (647,870,000) | (746,769,000) | (769,075,000) | 0 | (711,000) | 0 | (711,000) | 0 | 0 | 0 | 0 | ||||||||||||||||||
| Net loans and leases | 43,721,990,000 | 42,472,630,000 | 0 | 202,746,000 | 0 | 150,460,000 | 0 | 52,286,000 | 0 | 0 | ||||||||||||||||||||
| Accrued income and other assets | 1,646,935,000 | 1,609,877,000 | 256,000 | 982,000 | 0 | 485,000 | 0 | 235,000 | 256,000 | 262,000 | ||||||||||||||||||||
| Total assets | 61,145,753,000 | 59,467,175,000 | 256,000 | 291,461,000 | 0 | 230,098,000 | 0 | 61,101,000 | 256,000 | 262,000 | ||||||||||||||||||||
| Liabilities | ||||||||||||||||||||||||||||||
| Other long term debt | 1,842,684,000 | 1,349,119,000 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||||||||||||||
| Accrued interest and other liabilities | 1,065,721,000 | 1,059,888,000 | 256,000 | 262,000 | 0 | 0 | 0 | 0 | 256,000 | 262,000 | ||||||||||||||||||||
| Total liabilities | 54,969,519,000 | 53,377,021,000 | 256,000 | 262,000 | 0 | 0 | 0 | 0 | 256,000 | 262,000 | ||||||||||||||||||||
| Carrying amount and classification of unconsolidated trusts assets and liabilities | ||||||||||||||||||||||||||||||
| Total assets | 403,609,000 | 414,103,000 | 13,919,000 | 13,764,000 | 6,098,000 | 7,396,000 | 4,809,000 | 5,975,000 | 2,385,000 | 3,040,000 | 66,436,000 | 66,702,000 | 309,962,000 | 317,226,000 | ||||||||||||||||
| Total liabilities | 502,727,000 | 512,498,000 | 317,052,000 | 312,894,000 | 0 | 0 | 0 | 0 | 0 | 0 | 65,000,000 | 65,000,000 | 120,675,000 | 134,604,000 | ||||||||||||||||
| Maximum exposure to loss | 403,609,000 | 400,339,000 | 13,919,000 | 0 | 6,098,000 | 7,396,000 | 4,809,000 | 5,975,000 | 2,385,000 | 3,040,000 | 66,436,000 | 66,702,000 | 309,962,000 | 317,226,000 | ||||||||||||||||
| Affortable Housing Tax Credit Investments [Abstract] | ||||||||||||||||||||||||||||||
| Affordable housing tax credit investments | 487,119,000 | 484,799,000 | ||||||||||||||||||||||||||||
| Amortization | 177,157,000 | 167,573,000 | ||||||||||||||||||||||||||||
| Net affordable housing tax credit investments | 309,962,000 | 317,226,000 | ||||||||||||||||||||||||||||
| Unfunded commitments | 120,675,000 | 134,604,000 | ||||||||||||||||||||||||||||
| Tax credits and other tax benefits recognized | 14,316,000 | 13,788,000 | ||||||||||||||||||||||||||||
| Tax Credit Amortization Expense | 9,360,000 | 8,197,000 | ||||||||||||||||||||||||||||
| Tax Credit Investment Losses | 223,000 | 294,000 | ||||||||||||||||||||||||||||
| Variable Interest Entities (Textuals) [Abstract] | ||||||||||||||||||||||||||||||
| Maximum year to defer payment of interest on debenture | not exceeding five years time for a period | |||||||||||||||||||||||||||||
| Net sales of Low Income Housing Tax Credit Partnership investments | 0 | |||||||||||||||||||||||||||||
| Gain (loss) on net sales of Low Income Housing Tax Credit Partnership investments | 0 | |||||||||||||||||||||||||||||
| Total of automobile loans transferred in securitization transactions (not used) | 1,000,000,000 | 1,300,000,000 | 1,000,000,000 | |||||||||||||||||||||||||||
| Impairment Losses On Tax Credit Investments | $ 0 | $ 0 | ||||||||||||||||||||||||||||