Quarterly report pursuant to Section 13 or 15(d)

Fair Values of Assets and Liabilities (Recurring basis) (Details)

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Fair Values of Assets and Liabilities (Recurring basis) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Assets measured at fair value on a recurring basis    
Mortgage loans held for sale $ 570,189 $ 343,588
Recurring Basis [Member]
   
Assets measured at fair value on a recurring basis    
Mortgage loans held for sale 570,189 343,588
Trading account securities 53,837 45,899
Available-for-sale and other securities 8,370,745 7,791,499
Automobile loans 210,031 296,250
MSR's 45,061 65,001
Derivative assets 403,753 403,002
Liabilities measured at fair value on a recurring basis    
Securitization trust notes payable 32,794 123,039
Derivative liabilities 190,073 265,316
Other liabilities 0 751
Recurring Basis [Member] | U.S. Treasury [Member]
   
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale and other securities 52,718 53,204
Recurring Basis [Member] | Federal agencies - mortgage backed securities [Member]
   
Assets measured at fair value on a recurring basis    
Trading account securities 3,775 5,541
Available-for-sale and other securities 5,194,017 4,464,892
Recurring Basis [Member] | Federal agencies: Other agencies [Member]
   
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale and other securities 695,745 735,544
Recurring Basis [Member] | Municipal securities [Member]
   
Assets measured at fair value on a recurring basis    
Trading account securities 15,537 8,147
Available-for-sale and other securities 379,661 407,726
Recurring Basis [Member] | Private label CMO [Member]
   
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 67,145 72,364
Recurring Basis [Member] | Asset-backed Securities [Member]
   
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 1,060,460 967,088
Recurring Basis [Member] | Covered Bonds [Member]
   
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 287,649 504,045
Recurring Basis [Member] | Corporate debt [Member]
   
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 574,645 528,883
Recurring Basis [Member] | Other securities [Member]
   
Assets measured at fair value on a recurring basis    
Trading account securities 34,525 32,211
Available-for-sale and other securities 58,705 57,753
Recurring Basis [Member] | Level 1 [Member]
   
Assets measured at fair value on a recurring basis    
Mortgage loans held for sale 0 0
Trading account securities 34,007 32,085
Available-for-sale and other securities 107,530 106,823
Automobile loans 0 0
MSR's 0 0
Derivative assets 4,293 4,886
Liabilities measured at fair value on a recurring basis    
Securitization trust notes payable 0 0
Derivative liabilities 11,658 12,245
Other liabilities 0 0
Recurring Basis [Member] | Level 1 [Member] | U.S. Treasury [Member]
   
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale and other securities 52,718 53,204
Recurring Basis [Member] | Level 1 [Member] | Federal agencies - mortgage backed securities [Member]
   
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale and other securities 0 0
Recurring Basis [Member] | Level 1 [Member] | Federal agencies: Other agencies [Member]
   
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale and other securities 0 0
Recurring Basis [Member] | Level 1 [Member] | Municipal securities [Member]
   
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale and other securities 0 0
Recurring Basis [Member] | Level 1 [Member] | Private label CMO [Member]
   
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Recurring Basis [Member] | Level 1 [Member] | Asset-backed Securities [Member]
   
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Recurring Basis [Member] | Level 1 [Member] | Covered Bonds [Member]
   
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Recurring Basis [Member] | Level 1 [Member] | Corporate debt [Member]
   
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Recurring Basis [Member] | Level 1 [Member] | Other securities [Member]
   
Assets measured at fair value on a recurring basis    
Trading account securities 34,007 32,085
Available-for-sale and other securities 54,812 53,619
Recurring Basis [Member] | Level 2 [Member]
   
Assets measured at fair value on a recurring basis    
Mortgage loans held for sale 570,189 343,588
Trading account securities 19,830 13,814
Available-for-sale and other securities 7,998,245 7,395,522
Automobile loans 0 0
MSR's 0 0
Derivative assets 496,263 485,428
Liabilities measured at fair value on a recurring basis    
Securitization trust notes payable 32,794 123,039
Derivative liabilities 258,682 246,132
Other liabilities 0 751
Recurring Basis [Member] | Level 2 [Member] | U.S. Treasury [Member]
   
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale and other securities 0 0
Recurring Basis [Member] | Level 2 [Member] | Federal agencies - mortgage backed securities [Member]
   
Assets measured at fair value on a recurring basis    
Trading account securities 3,775 5,541
Available-for-sale and other securities 5,194,017 4,464,892
Recurring Basis [Member] | Level 2 [Member] | Federal agencies: Other agencies [Member]
   
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale and other securities 695,745 735,544
Recurring Basis [Member] | Level 2 [Member] | Municipal securities [Member]
   
Assets measured at fair value on a recurring basis    
Trading account securities 15,537 8,147
Available-for-sale and other securities 301,510 312,634
Recurring Basis [Member] | Level 2 [Member] | Private label CMO [Member]
   
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Recurring Basis [Member] | Level 2 [Member] | Asset-backed Securities [Member]
   
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 940,786 845,390
Recurring Basis [Member] | Level 2 [Member] | Covered Bonds [Member]
   
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 287,649 504,045
Recurring Basis [Member] | Level 2 [Member] | Corporate debt [Member]
   
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 574,645 528,883
Recurring Basis [Member] | Level 2 [Member] | Other securities [Member]
   
Assets measured at fair value on a recurring basis    
Trading account securities 518 126
Available-for-sale and other securities 3,893 4,134
Recurring Basis [Member] | Level 3 [Member]
   
Assets measured at fair value on a recurring basis    
Mortgage loans held for sale 0 0
Trading account securities 0 0
Available-for-sale and other securities 264,970 289,154
Automobile loans 210,031 296,250
MSR's 45,061 65,001
Derivative assets 12,844 6,770
Liabilities measured at fair value on a recurring basis    
Securitization trust notes payable 0 0
Derivative liabilities 453 6,939
Other liabilities 0 0
Recurring Basis [Member] | Level 3 [Member] | U.S. Treasury [Member]
   
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale and other securities 0 0
Recurring Basis [Member] | Level 3 [Member] | Federal agencies - mortgage backed securities [Member]
   
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale and other securities 0 0
Recurring Basis [Member] | Level 3 [Member] | Federal agencies: Other agencies [Member]
   
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale and other securities 0 0
Recurring Basis [Member] | Level 3 [Member] | Municipal securities [Member]
   
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale and other securities 78,151 95,092
Recurring Basis [Member] | Level 3 [Member] | Private label CMO [Member]
   
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 67,145 72,364
Recurring Basis [Member] | Level 3 [Member] | Asset-backed Securities [Member]
   
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 119,674 121,698
Recurring Basis [Member] | Level 3 [Member] | Covered Bonds [Member]
   
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Recurring Basis [Member] | Level 3 [Member] | Corporate debt [Member]
   
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Recurring Basis [Member] | Level 3 [Member] | Other securities [Member]
   
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale and other securities 0 0
Recurring Basis [Member] | Netting Adjustments [Member]
   
Assets measured at fair value on a recurring basis    
Mortgage loans held for sale 0 0
Trading account securities 0 0
Available-for-sale and other securities 0 0
Automobile loans 0 0
MSR's 0 0
Derivative assets (109,647) (94,082)
Liabilities measured at fair value on a recurring basis    
Securitization trust notes payable 0 0
Derivative liabilities (80,720) 0
Other liabilities 0 0
Recurring Basis [Member] | Netting Adjustments [Member] | U.S. Treasury [Member]
   
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale and other securities 0 0
Recurring Basis [Member] | Netting Adjustments [Member] | Federal agencies - mortgage backed securities [Member]
   
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale and other securities 0 0
Recurring Basis [Member] | Netting Adjustments [Member] | Federal agencies: Other agencies [Member]
   
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale and other securities 0 0
Recurring Basis [Member] | Netting Adjustments [Member] | Municipal securities [Member]
   
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale and other securities 0 0
Recurring Basis [Member] | Netting Adjustments [Member] | Private label CMO [Member]
   
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Recurring Basis [Member] | Netting Adjustments [Member] | Asset-backed Securities [Member]
   
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Recurring Basis [Member] | Netting Adjustments [Member] | Covered Bonds [Member]
   
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Recurring Basis [Member] | Netting Adjustments [Member] | Corporate debt [Member]
   
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 0
Recurring Basis [Member] | Netting Adjustments [Member] | Other securities [Member]
   
Assets measured at fair value on a recurring basis    
Trading account securities 0 0
Available-for-sale and other securities $ 0 $ 0