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, 2014
Dec. 31, 2013
Assets measured at fair value on a recurring basis    
Trading account securities $ 66,460 $ 35,573
Available-for-sale and other securities 8,721,804 7,308,753
Liabilities measured at fair value on a recurring basis    
Short-term borrowings   (1,089)
Recurring Basis [Member]
   
Assets measured at fair value on a recurring basis    
Mortgage loans held for sale 339,061 278,928
Trading account securities 66,460 35,573
Available-for-sale and other securities 8,390,482 6,987,762
Automobile loans 16,700 52,286
MSR's 25,438 34,236
Derivative assets 207,336 200,029
Liabilities measured at fair value on a recurring basis    
Derivatives 138,476 129,274
Other liabilities 2,990  
Recurring Basis [Member] | U.S. Treasury [Member]
   
Assets measured at fair value on a recurring basis    
Trading account securities 15,580 0
Available-for-sale and other securities 5,424 51,604
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 4,986,832 3,566,221
Recurring Basis [Member] | Federal agencies: Other agencies [Member]
   
Assets measured at fair value on a recurring basis    
Trading account securities 2,246 834
Available-for-sale and other securities 188,951 319,888
Recurring Basis [Member] | Municipal securities [Member]
   
Assets measured at fair value on a recurring basis    
Trading account securities 5,804 2,180
Available-for-sale and other securities 1,714,801 1,145,992
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 43,672 49,104
Recurring Basis [Member] | Asset-backed Securities [Member]
   
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 933,200 1,091,040
Recurring Basis [Member] | Covered Bonds [Member]
   
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 285,874
Recurring Basis [Member] | Corporate debt [Member]
   
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 497,483 457,240
Recurring Basis [Member] | Other securities [Member]
   
Assets measured at fair value on a recurring basis    
Trading account securities 42,830 32,559
Available-for-sale and other securities 20,119 20,799
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 55,185 32,081
Available-for-sale and other securities 21,727 68,575
Automobile loans 0 0
MSR's 0 0
Derivative assets 44,242 36,774
Liabilities measured at fair value on a recurring basis    
Derivatives 39,227 22,787
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 15,580 0
Available-for-sale and other securities 5,424 51,604
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 39,605 32,081
Available-for-sale and other securities 16,303 16,971
Recurring Basis [Member] | Level 2 [Member]
   
Assets measured at fair value on a recurring basis    
Mortgage loans held for sale 339,061 278,928
Trading account securities 11,275 3,492
Available-for-sale and other securities 6,994,442 6,125,091
Automobile loans 0 0
MSR's 0 0
Derivative assets 217,448 219,045
Liabilities measured at fair value on a recurring basis    
Derivatives 134,710 124,123
Other liabilities 2,990  
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 4,986,832 3,566,221
Recurring Basis [Member] | Level 2 [Member] | Federal agencies: Other agencies [Member]
   
Assets measured at fair value on a recurring basis    
Trading account securities 2,246 834
Available-for-sale and other securities 188,951 319,888
Recurring Basis [Member] | Level 2 [Member] | Municipal securities [Member]
   
Assets measured at fair value on a recurring basis    
Trading account securities 5,804 2,180
Available-for-sale and other securities 460,006 491,455
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 12,738 16,964
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 844,616 983,621
Recurring Basis [Member] | Level 2 [Member] | Covered Bonds [Member]
   
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 285,874
Recurring Basis [Member] | Level 2 [Member] | Corporate debt [Member]
   
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 497,483 457,240
Recurring Basis [Member] | Level 2 [Member] | Other securities [Member]
   
Assets measured at fair value on a recurring basis    
Trading account securities 3,225 478
Available-for-sale and other securities 3,816 3,828
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 1,374,313 794,096
Automobile loans 16,700 52,286
MSR's 25,438 34,236
Derivative assets 4,262 3,066
Liabilities measured at fair value on a recurring basis    
Derivatives 727 676
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 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 1,254,795 654,537
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 30,934 32,140
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 88,584 107,419
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 (58,616) (58,856)
Liabilities measured at fair value on a recurring basis    
Derivatives (36,188) (18,312)
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] | 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