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Variable Interest Entities (Consolidated and Unconsolidated) (Details) (USD $)
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3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | ||||||||||||||||||||||||||||||||||
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Jun. 30, 2014
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Mar. 31, 2014
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Jun. 30, 2013
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Sep. 30, 2012
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Jun. 30, 2014
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Dec. 31, 2013
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Mar. 31, 2013
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Dec. 31, 2012
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Jun. 30, 2014
Consolidated Trusts [Member]
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Dec. 31, 2013
Consolidated Trusts [Member]
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Jun. 30, 2014
2006 Automobile Trust [Member]
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Dec. 31, 2013
2006 Automobile Trust [Member]
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Jun. 30, 2014
2009 Automobile Trust [Member]
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Dec. 31, 2013
2009 Automobile Trust [Member]
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Jun. 30, 2014
Franklin 2009 Trust [Member]
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Dec. 31, 2013
Franklin 2009 Trust [Member]
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Jun. 30, 2014
Unconsolidated Trusts [Member]
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Dec. 31, 2013
Unconsolidated Trusts [Member]
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Jun. 30, 2014
Trust Preferred Securities Total [Member]
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Dec. 31, 2013
Trust Preferred Securities Total [Member]
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Jun. 30, 2014
2012-2 Automobile Trust [Member]
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Dec. 31, 2013
2012-2 Automobile Trust [Member]
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Jun. 30, 2014
2012-1 Automobile Trust [Member]
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Dec. 31, 2013
2012-1 Automobile Trust [Member]
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Jun. 30, 2014
2011 Automobile Trust [Member]
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Dec. 31, 2013
2011 Automobile Trust [Member]
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Jun. 30, 2014
Tower Hill Securities [Member]
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Dec. 31, 2013
Tower Hill Securities [Member]
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Jun. 30, 2014
Low Income Housing Tax Credit Partnerships [Member]
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Jun. 30, 2013
Low Income Housing Tax Credit Partnerships [Member]
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Jun. 30, 2014
Low Income Housing Tax Credit Partnerships [Member]
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Jun. 30, 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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Jun. 30, 2014
Proportional Amortization Method [Member]
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Jun. 30, 2013
Proportional Amortization Method [Member]
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Jun. 30, 2014
Proportional Amortization Method [Member]
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Jun. 30, 2013
Proportional Amortization Method [Member]
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Jun. 30, 2014
Equity Method [Member]
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Jun. 30, 2013
Equity Method [Member]
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Jun. 30, 2014
Equity Method [Member]
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Jun. 30, 2013
Equity Method [Member]
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Jun. 30, 2014
Other investments
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Dec. 31, 2013
Other investments
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| Assets | |||||||||||||||||||||||||||||||||||||||||||
| Cash | $ 1,218,453,000 | $ 1,218,453,000 | $ 1,001,132,000 | $ 0 | $ 87,733,000 | $ 0 | $ 79,153,000 | $ 0 | $ 8,580,000 | $ 0 | $ 0 | ||||||||||||||||||||||||||||||||
| Loans and leases | 46,079,775,000 | 46,079,775,000 | 43,120,500,000 | 0 | 203,457,000 | 0 | 151,171,000 | 0 | 52,286,000 | 0 | 0 | ||||||||||||||||||||||||||||||||
| Allowance for loan and lease losses | (635,101,000) | (631,918,000) | (733,076,000) | (635,101,000) | (647,870,000) | (746,769,000) | (769,075,000) | 0 | (711,000) | 0 | (711,000) | 0 | 0 | 0 | 0 | ||||||||||||||||||||||||||||
| Net loans and leases | 45,444,674,000 | 45,444,674,000 | 42,472,630,000 | 0 | 202,746,000 | 0 | 150,460,000 | 0 | 52,286,000 | 0 | 0 | ||||||||||||||||||||||||||||||||
| Accrued income and other assets | 1,679,729,000 | 1,679,729,000 | 1,609,876,000 | 252,000 | 982,000 | 0 | 485,000 | 0 | 235,000 | 252,000 | 262,000 | ||||||||||||||||||||||||||||||||
| Total assets | 63,797,113,000 | 63,797,113,000 | 59,467,174,000 | 252,000 | 291,461,000 | 0 | 230,098,000 | 0 | 61,101,000 | 252,000 | 262,000 | ||||||||||||||||||||||||||||||||
| Liabilities | |||||||||||||||||||||||||||||||||||||||||||
| Other long term debt | 2,602,869,000 | 2,602,869,000 | 1,349,119,000 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||||||||||||||||||||||||||
| Accrued interest and other liabilities | 1,085,796,000 | 1,085,796,000 | 1,059,888,000 | 252,000 | 262,000 | 0 | 0 | 0 | 0 | 252,000 | 262,000 | ||||||||||||||||||||||||||||||||
| Total liabilities | 57,556,322,000 | 57,556,322,000 | 53,377,021,000 | 252,000 | 262,000 | 0 | 0 | 0 | 0 | 252,000 | 262,000 | ||||||||||||||||||||||||||||||||
| Carrying amount and classification of unconsolidated trusts assets and liabilities | |||||||||||||||||||||||||||||||||||||||||||
| Total assets | 500,465,000 | 504,381,000 | 13,919,000 | 13,764,000 | 5,025,000 | 7,396,000 | 3,786,000 | 5,975,000 | 1,814,000 | 3,040,000 | 66,357,000 | 66,702,000 | 320,320,000 | 320,320,000 | 317,226,000 | 89,244,000 | 90,278,000 | ||||||||||||||||||||||||||
| Total liabilities | 523,192,000 | 522,270,000 | 317,059,000 | 312,894,000 | 0 | 0 | 0 | 0 | 0 | 0 | 65,000,000 | 65,000,000 | 124,458,000 | 124,458,000 | 134,604,000 | 16,675,000 | 9,772,000 | ||||||||||||||||||||||||||
| Maximum exposure to loss | 486,546,000 | 490,617,000 | 0 | 0 | 5,025,000 | 7,396,000 | 3,786,000 | 5,975,000 | 1,814,000 | 3,040,000 | 66,357,000 | 66,702,000 | 320,320,000 | 320,320,000 | 317,226,000 | 89,244,000 | 90,278,000 | ||||||||||||||||||||||||||
| Affortable Housing Tax Credit Investments [Abstract] | |||||||||||||||||||||||||||||||||||||||||||
| Affordable housing tax credit investments | 509,299,000 | 509,299,000 | 484,799,000 | ||||||||||||||||||||||||||||||||||||||||
| Amortization | 188,979,000 | 167,573,000 | |||||||||||||||||||||||||||||||||||||||||
| Net affordable housing tax credit investments | 320,320,000 | 320,320,000 | 317,226,000 | ||||||||||||||||||||||||||||||||||||||||
| Unfunded commitments | 124,458,000 | 124,458,000 | 134,604,000 | ||||||||||||||||||||||||||||||||||||||||
| Tax credits and other tax benefits recognized | 13,744,000 | 14,090,000 | 28,061,000 | 27,878,000 | |||||||||||||||||||||||||||||||||||||||
| Tax Credit Amortization Expense | 9,518,000 | 8,197,000 | 18,877,000 | 16,395,000 | |||||||||||||||||||||||||||||||||||||||
| Tax Credit Investment Losses | 223,000 | 294,000 | 446,000 | 588,000 | |||||||||||||||||||||||||||||||||||||||
| 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 | $ 0 | ||||||||||||||||||||||||||||||||||||||||