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
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Assets measured at fair value on a recurring basis        
MSR's $ 35,582 $ 35,202 $ 62,454 $ 65,001
Recurring Basis [Member]
       
Assets measured at fair value on a recurring basis        
Mortgage loans held for sale 415,126 452,949    
Trading account securities 86,520 91,205    
Available-for-sale and other securities 7,192,901 7,258,100    
Automobile loans 116,039 142,762    
MSR's 35,582 35,202    
Derivative assets 330,731 385,697    
Liabilities measured at fair value on a recurring basis        
Derivative liabilities 138,280 152,188    
Other liabilities 278 0    
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 52,066 52,311    
Recurring Basis [Member] | Federal agencies - mortgage backed securities [Member]
       
Assets measured at fair value on a recurring basis        
Trading account securities 96 0    
Available-for-sale and other securities 4,176,933 4,264,670    
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 354,491 359,626    
Recurring Basis [Member] | Municipal securities [Member]
       
Assets measured at fair value on a recurring basis        
Trading account securities 6,835 15,218    
Available-for-sale and other securities 591,065 501,000    
Recurring Basis [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]
       
Assets measured at fair value on a recurring basis        
Available-for-sale and other securities 66,980 71,568    
Recurring Basis [Member] | Asset-backed Securities [Member]
       
Assets measured at fair value on a recurring basis        
Available-for-sale and other securities 1,098,863 1,029,083    
Recurring Basis [Member] | Covered Bonds [Member]
       
Assets measured at fair value on a recurring basis        
Available-for-sale and other securities 289,409 290,625    
Recurring Basis [Member] | Corporate debt [Member]
       
Assets measured at fair value on a recurring basis        
Available-for-sale and other securities 541,715 668,142    
Recurring Basis [Member] | Other securities [Member]
       
Assets measured at fair value on a recurring basis        
Trading account securities 79,589 75,987    
Available-for-sale and other securities 21,379 21,075    
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 78,953 75,729    
Available-for-sale and other securities 69,045 69,488    
Automobile loans 0 0    
MSR's 0 0    
Derivative assets 8,511 6,368    
Liabilities measured at fair value on a recurring basis        
Derivative liabilities 8,794 6,813    
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 52,066 52,311    
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] | Mortgage-backed Securities, Issued by Private Enterprises [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 78,953 75,729    
Available-for-sale and other securities 16,979 17,177    
Recurring Basis [Member] | Level 2 [Member]
       
Assets measured at fair value on a recurring basis        
Mortgage loans held for sale 415,126 452,949    
Trading account securities 7,567 15,476    
Available-for-sale and other securities 6,903,757 6,968,572    
Automobile loans 0 0    
MSR's 0 0    
Derivative assets 412,383 465,517    
Liabilities measured at fair value on a recurring basis        
Derivative liabilities 200,453 228,312    
Other liabilities 278 0    
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 96 0    
Available-for-sale and other securities 4,176,933 4,264,670    
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 354,491 359,626    
Recurring Basis [Member] | Level 2 [Member] | Municipal securities [Member]
       
Assets measured at fair value on a recurring basis        
Trading account securities 6,835 15,218    
Available-for-sale and other securities 531,967 439,772    
Recurring Basis [Member] | Level 2 [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]
       
Assets measured at fair value on a recurring basis        
Available-for-sale and other securities 21,434 22,793    
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 983,408 919,046    
Recurring Basis [Member] | Level 2 [Member] | Covered Bonds [Member]
       
Assets measured at fair value on a recurring basis        
Available-for-sale and other securities 289,409 290,625    
Recurring Basis [Member] | Level 2 [Member] | Corporate debt [Member]
       
Assets measured at fair value on a recurring basis        
Available-for-sale and other securities 541,715 668,142    
Recurring Basis [Member] | Level 2 [Member] | Other securities [Member]
       
Assets measured at fair value on a recurring basis        
Trading account securities 636 258    
Available-for-sale and other securities 4,400 3,898    
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 220,099 220,040    
Automobile loans 116,039 142,762    
MSR's 35,582 35,202    
Derivative assets 9,530 13,180    
Liabilities measured at fair value on a recurring basis        
Derivative liabilities 524 478    
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 59,098 61,228    
Recurring Basis [Member] | Level 3 [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]
       
Assets measured at fair value on a recurring basis        
Available-for-sale and other securities 45,546 48,775    
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 115,455 110,037    
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 (99,693) (99,368)    
Liabilities measured at fair value on a recurring basis        
Derivative liabilities (71,491) (83,415)    
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] | Mortgage-backed Securities, Issued by Private Enterprises [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