Annual report pursuant to Section 13 and 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
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Assets measured at fair value on a recurring basis      
Trading account securities $ 35,573 $ 91,205  
Available-for-sale and other securities 7,308,753 7,566,175  
MSR's 34,236 35,202 65,001
Derivative assets 153,880    
Level 3 [Member] | U.S. Treasury [Member]
     
Assets measured at fair value on a recurring basis      
Trading account securities   0  
Recurring Basis [Member]
     
Assets measured at fair value on a recurring basis      
Mortgage loans held for sale 278,928 452,949  
Trading account securities 35,573 91,205  
Available-for-sale and other securities 6,987,762 7,258,100  
Automobile loans 52,286 142,762  
MSR's 34,236 35,202  
Derivative assets 200,029 385,697  
Liabilities measured at fair value on a recurring basis      
Securitization trust notes payable 0 0  
Derivatives 129,274 152,188  
Other liabilities   0  
Short-term borrowings (1,089)    
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 51,604 52,311  
Recurring Basis [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 3,566,221 4,264,670  
Recurring Basis [Member] | TLGP securities [Member]
     
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 0    
Recurring Basis [Member] | Federal agencies: Other agencies [Member]
     
Assets measured at fair value on a recurring basis      
Trading account securities 834 0  
Available-for-sale and other securities 319,888 359,626  
Recurring Basis [Member] | Municipal securities [Member]
     
Assets measured at fair value on a recurring basis      
Trading account securities 2,180 15,218  
Available-for-sale and other securities 1,145,992 501,000  
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 49,104 71,568  
Recurring Basis [Member] | Asset-backed Securities [Member]
     
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 1,091,040 1,029,083  
Recurring Basis [Member] | Covered Bonds [Member]
     
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 285,874 290,625  
Recurring Basis [Member] | Corporate debt [Member]
     
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 457,240 668,142  
Recurring Basis [Member] | Other securities [Member]
     
Assets measured at fair value on a recurring basis      
Trading account securities 32,559 75,987  
Available-for-sale and other securities 20,799 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 32,081 75,729  
Available-for-sale and other securities 68,575 69,488  
Automobile loans 0 0  
MSR's 0 0  
Derivative assets 36,774 6,368  
Liabilities measured at fair value on a recurring basis      
Securitization trust notes payable 0 0  
Derivatives 22,787 6,813  
Other liabilities   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 51,604 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] | TLGP securities [Member]
     
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 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 32,081 75,729  
Available-for-sale and other securities 16,971 17,177  
Recurring Basis [Member] | Level 2 [Member]
     
Assets measured at fair value on a recurring basis      
Mortgage loans held for sale 278,928 452,949  
Trading account securities 3,492 15,476  
Available-for-sale and other securities 6,125,091 6,968,572  
Automobile loans 0 0  
MSR's 0 0  
Derivative assets 219,045 465,517  
Liabilities measured at fair value on a recurring basis      
Securitization trust notes payable 0 0  
Derivatives 124,123 228,312  
Other liabilities   0  
Short-term borrowings (1,089)    
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 0 0  
Available-for-sale and other securities 3,566,221 4,264,670  
Recurring Basis [Member] | Level 2 [Member] | TLGP securities [Member]
     
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 0    
Recurring Basis [Member] | Level 2 [Member] | Federal agencies: Other agencies [Member]
     
Assets measured at fair value on a recurring basis      
Trading account securities 834 0  
Available-for-sale and other securities 319,888 359,626  
Recurring Basis [Member] | Level 2 [Member] | Municipal securities [Member]
     
Assets measured at fair value on a recurring basis      
Trading account securities 2,180 15,218  
Available-for-sale and other securities 491,455 439,772  
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 16,964 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 983,621 919,046  
Recurring Basis [Member] | Level 2 [Member] | Covered Bonds [Member]
     
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 285,874 290,625  
Recurring Basis [Member] | Level 2 [Member] | Corporate debt [Member]
     
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 457,240 668,142  
Recurring Basis [Member] | Level 2 [Member] | Other securities [Member]
     
Assets measured at fair value on a recurring basis      
Trading account securities 478 258  
Available-for-sale and other securities 3,828 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 794,096 220,040  
Automobile loans 52,286 142,762  
MSR's 34,236 35,202  
Derivative assets 3,066 13,180  
Liabilities measured at fair value on a recurring basis      
Securitization trust notes payable 0 0  
Derivatives 676 478  
Other liabilities   0  
Recurring Basis [Member] | Level 3 [Member] | U.S. Treasury [Member]
     
Assets measured at fair value on a recurring basis      
Trading account securities 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] | TLGP securities [Member]
     
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 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 654,537 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 32,140 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 107,419 110,037  
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 (58,856) (99,368)  
Liabilities measured at fair value on a recurring basis      
Securitization trust notes payable 0 0  
Derivatives (18,312) (83,415)  
Other liabilities   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] | TLGP securities [Member]
     
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 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    
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