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Fair Value Measurements, Fair Value Of Financial Instruments as Measured On a Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Assets: [Abstract]            
Trading securities $ 1,613,400   $ 462,676 $ 614,117    
Available for sale securities 8,072,014   8,321,578 8,383,199    
Fair value option securities 452,150   755,054 819,531    
Mortgage servicing rights 284,673 $ 278,719 252,867 245,858 $ 245,239 $ 247,073
Derviative contracts, net of cash collateral, Assets, Fair value 349,481   220,502 352,559    
Liabilities: [Abstract]            
Derivative contracts, net of cash collateral, Liabilities, Fair Value 252,387   171,963 336,327    
U.S. government agency debentures [Member]            
Assets: [Abstract]            
Trading securities 80,692   21,196 30,162    
U.S. government agency residential mortgage-backed securities [Member]            
Assets: [Abstract]            
Trading securities 1,378,450   392,673 516,760    
Available for sale securities 5,132,352   5,309,152 5,326,384    
Fair value option securities 452,150   755,054 819,531    
Municipal and other tax-exempt securities [Member]            
Assets: [Abstract]            
Trading securities 41,345   13,559 56,148    
Available for sale securities 4,349   27,080 28,368    
Asset-backed securities [Member]            
Assets: [Abstract]            
Trading securities 72,309   23,885 0    
U.S. Treasury [Member]            
Assets: [Abstract]            
Available for sale securities 490   1,000 999    
Privately issued residential mortgage-backed securities [Member]            
Assets: [Abstract]            
Available for sale securities 74,685   93,221 99,994    
Commercial mortgage-backed securities guaranteed by U.S. government agencies [Member]            
Assets: [Abstract]            
Available for sale securities 2,834,691   2,834,961 2,889,346    
Other debt securities [Member]            
Assets: [Abstract]            
Trading securities 40,604   11,363 11,047    
Available for sale securities 25,447   25,481 4,153    
Perpetual preferred stock [Member]            
Assets: [Abstract]            
Available for sale securities     15,767 16,245    
Equity securities and mutual funds [Member]            
Assets: [Abstract]            
Available for sale securities     14,916 17,710    
Fair Value, Measurements, Recurring [Member]            
Assets: [Abstract]            
Trading securities 1,613,400   462,676 614,117    
Available for sale securities 8,072,014   8,321,578 8,383,199    
Residential mortgage loans held for sale 175,866   221,378 275,643    
Mortgage servicing rights 284,673 [1]   252,867 [2] 245,858 [3]    
Derviative contracts, net of cash collateral, Assets, Fair value 349,481 [4]   220,502 [5] 352,559 [6]    
Liabilities: [Abstract]            
Derivative contracts, net of cash collateral, Liabilities, Fair Value 252,387 [4]   171,963 [5] 336,327 [6]    
Fair Value, Measurements, Recurring [Member] | U.S. government agency debentures [Member]            
Assets: [Abstract]            
Trading securities 80,692   21,196 30,162    
Fair Value, Measurements, Recurring [Member] | U.S. government agency residential mortgage-backed securities [Member]            
Assets: [Abstract]            
Trading securities 1,378,450   392,673 516,760    
Available for sale securities 5,132,352   5,309,152 5,326,384    
Fair value option securities 452,150   755,054 819,531    
Fair Value, Measurements, Recurring [Member] | Municipal and other tax-exempt securities [Member]            
Assets: [Abstract]            
Trading securities 41,345   13,559 56,148    
Available for sale securities 4,349   27,080 28,368    
Fair Value, Measurements, Recurring [Member] | Asset-backed securities [Member]            
Assets: [Abstract]            
Trading securities 72,309   23,885      
Fair Value, Measurements, Recurring [Member] | U.S. Treasury [Member]            
Assets: [Abstract]            
Available for sale securities 490   1,000 999    
Fair Value, Measurements, Recurring [Member] | Privately issued residential mortgage-backed securities [Member]            
Assets: [Abstract]            
Available for sale securities 74,685   93,221 99,994    
Fair Value, Measurements, Recurring [Member] | Commercial mortgage-backed securities guaranteed by U.S. government agencies [Member]            
Assets: [Abstract]            
Available for sale securities 2,834,691   2,834,961 2,889,346    
Fair Value, Measurements, Recurring [Member] | Other debt securities [Member]            
Assets: [Abstract]            
Trading securities 40,604   11,363 11,047    
Available for sale securities 25,447   25,481 4,153    
Fair Value, Measurements, Recurring [Member] | Perpetual preferred stock [Member]            
Assets: [Abstract]            
Available for sale securities     15,767 16,245    
Fair Value, Measurements, Recurring [Member] | Equity securities and mutual funds [Member]            
Assets: [Abstract]            
Available for sale securities     14,916 17,710    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]            
Assets: [Abstract]            
Trading securities 0   0 0    
Available for sale securities 490   1,000 3,577    
Residential mortgage loans held for sale 0   0 0    
Mortgage servicing rights 0 [1]   0 [2] 0 [3]    
Derviative contracts, net of cash collateral, Assets, Fair value 26,196 [4]   8,179 [5] 8,498 [6]    
Liabilities: [Abstract]            
Derivative contracts, net of cash collateral, Liabilities, Fair Value 17,872 [4]   0 [5] 6,903 [6]    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. government agency debentures [Member]            
Assets: [Abstract]            
Trading securities 0   0 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. government agency residential mortgage-backed securities [Member]            
Assets: [Abstract]            
Trading securities 0   0 0    
Available for sale securities 0   0 0    
Fair value option securities 0   0 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Municipal and other tax-exempt securities [Member]            
Assets: [Abstract]            
Trading securities 0   0 0    
Available for sale securities 0   0 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Asset-backed securities [Member]            
Assets: [Abstract]            
Trading securities 0   0      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. Treasury [Member]            
Assets: [Abstract]            
Available for sale securities 490   1,000 999    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Privately issued residential mortgage-backed securities [Member]            
Assets: [Abstract]            
Available for sale securities 0   0 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Commercial mortgage-backed securities guaranteed by U.S. government agencies [Member]            
Assets: [Abstract]            
Available for sale securities 0   0 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other debt securities [Member]            
Assets: [Abstract]            
Trading securities 0   0 0    
Available for sale securities 0   0 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Perpetual preferred stock [Member]            
Assets: [Abstract]            
Available for sale securities     0 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Equity securities and mutual funds [Member]            
Assets: [Abstract]            
Available for sale securities     0 2,578    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]            
Assets: [Abstract]            
Trading securities 1,613,400   462,676 614,117    
Available for sale securities 8,071,052   8,315,304 8,370,684    
Residential mortgage loans held for sale 159,028   209,079 263,543    
Mortgage servicing rights 0 [1]   0 [2] 0 [3]    
Derviative contracts, net of cash collateral, Assets, Fair value 323,285 [4]   212,323 [5] 344,061 [6]    
Liabilities: [Abstract]            
Derivative contracts, net of cash collateral, Liabilities, Fair Value 234,515 [4]   171,963 [5] 329,424 [6]    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. government agency debentures [Member]            
Assets: [Abstract]            
Trading securities 80,692   21,196 30,162    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. government agency residential mortgage-backed securities [Member]            
Assets: [Abstract]            
Trading securities 1,378,450   392,673 516,760    
Available for sale securities 5,132,352   5,309,152 5,326,384    
Fair value option securities 452,150   755,054 819,531    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Municipal and other tax-exempt securities [Member]            
Assets: [Abstract]            
Trading securities 41,345   13,559 56,148    
Available for sale securities 4,349   22,278 23,583    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-backed securities [Member]            
Assets: [Abstract]            
Trading securities 72,309   23,885      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. Treasury [Member]            
Assets: [Abstract]            
Available for sale securities 0   0 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Privately issued residential mortgage-backed securities [Member]            
Assets: [Abstract]            
Available for sale securities 74,685   93,221 99,994    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial mortgage-backed securities guaranteed by U.S. government agencies [Member]            
Assets: [Abstract]            
Available for sale securities 2,834,691   2,834,961 2,889,346    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other debt securities [Member]            
Assets: [Abstract]            
Trading securities 40,604   11,363 11,047    
Available for sale securities 24,975   25,009 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Perpetual preferred stock [Member]            
Assets: [Abstract]            
Available for sale securities     15,767 16,245    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Equity securities and mutual funds [Member]            
Assets: [Abstract]            
Available for sale securities     14,916 15,132    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]            
Assets: [Abstract]            
Trading securities 0   0 0    
Available for sale securities 472   5,274 8,938    
Residential mortgage loans held for sale 16,838   12,299 12,100    
Mortgage servicing rights 284,673 [1]   252,867 [2] 245,858 [3]    
Derviative contracts, net of cash collateral, Assets, Fair value 0 [4]   0 [5] 0 [6]    
Liabilities: [Abstract]            
Derivative contracts, net of cash collateral, Liabilities, Fair Value 0 [4]   0 [5] 0 [6]    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | U.S. government agency debentures [Member]            
Assets: [Abstract]            
Trading securities 0   0 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | U.S. government agency residential mortgage-backed securities [Member]            
Assets: [Abstract]            
Trading securities 0   0 0    
Available for sale securities 0   0 0    
Fair value option securities 0   0 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Municipal and other tax-exempt securities [Member]            
Assets: [Abstract]            
Trading securities 0   0 0    
Available for sale securities   4,802 4,785    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Asset-backed securities [Member]            
Assets: [Abstract]            
Trading securities 0   0      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | U.S. Treasury [Member]            
Assets: [Abstract]            
Available for sale securities 0   0 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Privately issued residential mortgage-backed securities [Member]            
Assets: [Abstract]            
Available for sale securities 0   0 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Commercial mortgage-backed securities guaranteed by U.S. government agencies [Member]            
Assets: [Abstract]            
Available for sale securities 0   0 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other debt securities [Member]            
Assets: [Abstract]            
Trading securities 0   0 0    
Available for sale securities $ 472   472 4,153    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Perpetual preferred stock [Member]            
Assets: [Abstract]            
Available for sale securities     0 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Equity securities and mutual funds [Member]            
Assets: [Abstract]            
Available for sale securities     $ 0 $ 0    
[1] A reconciliation of the beginning and ending fair value of mortgage servicing rights and disclosures of significant assumptions used to determine fair value are presented in Note 6, Mortgage Banking Activities.
[2] A reconciliation of the beginning and ending fair value of mortgage servicing rights and disclosures of significant assumptions used to determine fair value are presented in Note 6, Mortgage Banking Activities.
[3] A reconciliation of the beginning and ending fair value of mortgage servicing rights and disclosures of significant assumptions used to determine fair value are presented in Note 6, Mortgage Banking Activities.
[4] See Note 3 for detail of fair value of derivative contracts by contract type. Derivative contracts in asset positions that were valued based on quoted prices in active markets for identical instruments (Level 1) are primarily exchange-traded interest rate and agricultural derivative contacts, net of cash margin. Derivative contacts in liability positions that were valued using quoted prices in active markets for identical instruments are exchange-traded energy and interest rate derivative contracts, net of cash margin.
[5] See Note 3 for detail of fair value of derivative contracts by contract type. Derivative contracts based on quoted prices in active markets for identical instruments (Level 1) are exchange-traded interest rate, energy and agricultural derivative contacts. Derivative contracts in liability positions that were valued using quoted prices in active markets for identical instruments (Level 1) are exchange-traded interest rate and energy derivative contracts, fully offset by cash margin.
[6] See Note 3 for detail of fair value of derivative contracts by contract type. Derivative contracts based on quoted prices in active markets for identical instruments (Level 1) are exchange-traded interest rate, energy and agricultural derivative contacts. Derivative contracts in liability positions that were valued using quoted prices in active markets for identical instruments (Level 1) are exchange-traded interest rate derivative contracts, net cash margin.