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
Sep. 30, 2013
Dec. 31, 2012
Assets measured at fair value on a recurring basis    
Trading account securities $ 74,167 $ 91,205
Available-for-sale and other securities 6,446,681 7,566,175
Recurring Basis [Member]
   
Assets measured at fair value on a recurring basis    
Mortgage loans held for sale 313,099 452,949
Trading account securities 74,167 91,205
Available-for-sale and other securities 6,129,219 7,258,100
Automobile loans 69,780 142,762
MSR's 34,106 35,202
Derivative assets 218,706 385,697
Liabilities measured at fair value on a recurring basis    
Derivatives 131,349 152,188
Other liabilities 0 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 51,554 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 3,221,711 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 339,419 359,626
Recurring Basis [Member] | Municipal securities [Member]
   
Assets measured at fair value on a recurring basis    
Trading account securities 3,282 15,218
Available-for-sale and other securities 566,478 501,000
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 50,766 71,568
Recurring Basis [Member] | Asset-backed Securities [Member]
   
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 1,128,327 1,029,083
Recurring Basis [Member] | Covered Bonds [Member]
   
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 286,924 290,625
Recurring Basis [Member] | Corporate debt [Member]
   
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 460,972 668,142
Recurring Basis [Member] | Other securities [Member]
   
Assets measured at fair value on a recurring basis    
Trading account securities 70,885 75,987
Available-for-sale and other securities 23,068 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 70,447 75,729
Available-for-sale and other securities 70,848 69,488
Automobile loans 0 0
MSR's 0 0
Derivative assets 13,340 6,368
Liabilities measured at fair value on a recurring basis    
Derivatives 23,755 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 51,554 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 70,447 75,729
Available-for-sale and other securities 19,294 17,177
Recurring Basis [Member] | Level 2 [Member]
   
Assets measured at fair value on a recurring basis    
Mortgage loans held for sale 313,099 452,949
Trading account securities 3,720 15,476
Available-for-sale and other securities 5,852,283 6,968,572
Automobile loans 0 0
MSR's 0 0
Derivative assets 252,131 465,517
Liabilities measured at fair value on a recurring basis    
Derivatives 136,540 228,312
Other liabilities 0 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 0 0
Available-for-sale and other securities 3,221,711 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 339,419 359,626
Recurring Basis [Member] | Level 2 [Member] | Municipal securities [Member]
   
Assets measured at fair value on a recurring basis    
Trading account securities 3,282 15,218
Available-for-sale and other securities 507,623 439,772
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 18,435 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 1,013,425 919,046
Recurring Basis [Member] | Level 2 [Member] | Covered Bonds [Member]
   
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 286,924 290,625
Recurring Basis [Member] | Level 2 [Member] | Corporate debt [Member]
   
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 460,972 668,142
Recurring Basis [Member] | Level 2 [Member] | Other securities [Member]
   
Assets measured at fair value on a recurring basis    
Trading account securities 438 258
Available-for-sale and other securities 3,774 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 206,088 220,040
Automobile loans 69,780 142,762
MSR's 34,106 35,202
Derivative assets 8,127 13,180
Liabilities measured at fair value on a recurring basis    
Derivatives 542 478
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 58,855 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 32,331 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 114,902 110,037
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
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 (54,892) (99,368)
Liabilities measured at fair value on a recurring basis    
Derivatives (29,488) (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