Quarterly report pursuant to Section 13 or 15(d)

Variable Interest Entities (Consolidated and Unconsolidated) (Details)

v2.4.0.8
Variable Interest Entities (Consolidated and Unconsolidated) (Details) (USD $)
3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2014
Dec. 31, 2012
Mar. 31, 2012
Sep. 30, 2011
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Sep. 30, 2014
Consolidated Trusts [Member]
Dec. 31, 2013
Consolidated Trusts [Member]
Sep. 30, 2014
2006 Automobile Trust [Member]
Dec. 31, 2013
2006 Automobile Trust [Member]
Sep. 30, 2014
2009 Automobile Trust [Member]
Dec. 31, 2013
2009 Automobile Trust [Member]
Sep. 30, 2014
Franklin 2009 Trust [Member]
Dec. 31, 2013
Franklin 2009 Trust [Member]
Sep. 30, 2014
Unconsolidated Trusts [Member]
Dec. 31, 2013
Unconsolidated Trusts [Member]
Sep. 30, 2014
Trust Preferred Securities Total [Member]
Dec. 31, 2013
Trust Preferred Securities Total [Member]
Sep. 30, 2014
2012-2 Automobile Trust [Member]
Dec. 31, 2013
2012-2 Automobile Trust [Member]
Sep. 30, 2014
2012-1 Automobile Trust [Member]
Dec. 31, 2013
2012-1 Automobile Trust [Member]
Sep. 30, 2014
2011 Automobile Trust [Member]
Dec. 31, 2013
2011 Automobile Trust [Member]
Sep. 30, 2014
Tower Hill Securities [Member]
Dec. 31, 2013
Tower Hill Securities [Member]
Sep. 30, 2014
Low Income Housing Tax Credit Partnerships [Member]
Sep. 30, 2013
Low Income Housing Tax Credit Partnerships [Member]
Sep. 30, 2014
Low Income Housing Tax Credit Partnerships [Member]
Sep. 30, 2013
Low Income Housing Tax Credit Partnerships [Member]
Dec. 31, 2013
Low Income Housing Tax Credit Partnerships [Member]
Sep. 30, 2014
Proportional Amortization Method [Member]
Sep. 30, 2013
Proportional Amortization Method [Member]
Sep. 30, 2014
Proportional Amortization Method [Member]
Sep. 30, 2013
Proportional Amortization Method [Member]
Sep. 30, 2014
Equity Method [Member]
Sep. 30, 2013
Equity Method [Member]
Sep. 30, 2014
Equity Method [Member]
Sep. 30, 2013
Equity Method [Member]
Sep. 30, 2014
Other investments
Dec. 31, 2013
Other investments
Assets                                                                                        
Cash $ 879,862,000       $ 879,862,000   $ 1,001,132,000     $ 0 $ 87,733,000 $ 0 $ 79,153,000 $ 0 $ 8,580,000 $ 0 $ 0                                                      
Loans and leases 46,723,374,000       46,723,374,000   43,120,500,000     0 203,457,000 0 151,171,000 0 52,286,000 0 0                                                      
Allowance for loan and lease losses (631,036,000) (769,075,000)     (631,036,000) (635,101,000) (647,870,000) (666,030,000) (733,076,000) 0 (711,000) 0 (711,000) 0 0 0 0                                                      
Net loans and leases 46,092,338,000       46,092,338,000   42,472,630,000     0 202,746,000 0 150,460,000 0 52,286,000 0 0                                                      
Accrued income and other assets 1,665,071,000       1,665,071,000   1,609,876,000     243,000 982,000 0 485,000 0 235,000 243,000 262,000                                                      
Total assets 64,330,629,000       64,330,629,000   59,467,174,000     243,000 291,461,000 0 230,098,000 0 61,101,000 243,000 262,000                                                      
Liabilities                                                                                        
Other long term debt 2,590,212,000       2,590,212,000   1,349,119,000     0 0 0 0 0 0 0 0                                                      
Accrued interest and other liabilities 1,161,056,000       1,161,056,000   1,059,888,000     243,000 262,000 0 0 0 0 243,000 262,000                                                      
Total liabilities 58,046,419,000       58,046,419,000   53,377,021,000     243,000 262,000 0 0 0 0 243,000 262,000                                                      
Carrying amount and classification of unconsolidated trusts assets and liabilities                                                                                        
Total assets                                   501,436,000 504,381,000 13,919,000 13,764,000 4,071,000 7,396,000 2,898,000 5,975,000 1,336,000 3,040,000 56,145,000 66,702,000 340,133,000   340,133,000   317,226,000                 82,934,000 90,278,000
Total liabilities                                   540,942,000 522,270,000 317,067,000 312,894,000 0 0 0 0 0 0 65,000,000 65,000,000 141,791,000   141,791,000   134,604,000                 17,084,000 9,772,000
Maximum exposure to loss                                   487,517,000 490,617,000 0 0 4,071,000 7,396,000 2,898,000 5,975,000 1,336,000 3,040,000 56,145,000 66,702,000 340,133,000   340,133,000   317,226,000                 82,934,000 90,278,000
Affortable Housing Tax Credit Investments [Abstract]                                                                                        
Affordable housing tax credit investments                                                           538,836,000   538,836,000   484,799,000                    
Amortization                                                           198,703,000       167,573,000                    
Net affordable housing tax credit investments                                                           340,133,000   340,133,000   317,226,000                    
Unfunded commitments                                                           141,791,000   141,791,000   134,604,000                    
Tax credits and other tax benefits recognized                                                           13,370,000 13,984,000 41,430,000 41,861,000                      
Tax Credit Amortization Expense                                                                     9,659,000 8,197,000 28,537,000 24,592,000            
Tax Credit Investment Losses                                                                             290,000 294,000 737,000 882,000    
Variable Interest Entities (Textuals) [Abstract]                                                                                        
Maximum year to defer payment of interest on debenture not exceeding five years                                                                                      
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   1,000,000,000 1,300,000,000 1,000,000,000                                                                                
Impairment Losses On Tax Credit Investments $ 0       $ 0     $ 0