Fair Value Assets And Liabilities Measured On A Recurring Basis [Table Text Block] |
The fair value of financial assets and liabilities that are measured on a recurring basis is as follows as of December 31, 2016 (in thousands): | | | | | | | | | | | | | | | | | | | | Total | | Quoted Prices in Active Markets for Identical Instruments | | Significant Other Observable Inputs | | Significant Unobservable Inputs | Assets: | | | | | | | | | Trading securities: | | | | | | | | | U.S. government agency debentures | | $ | 6,234 |
| | $ | — |
| | $ | 6,234 |
| | $ | — |
| U.S. agency residential mortgage-backed securities | | 310,067 |
| | — |
| | 310,067 |
| | — |
| Municipal and other tax-exempt securities | | 14,427 |
| | — |
| | 14,427 |
| | — |
| Other trading securities | | 6,900 |
| | — |
| | 6,900 |
| | — |
| Total trading securities | | 337,628 |
| | — |
| | 337,628 |
| | — |
| Available for sale securities: | | |
| | |
| | |
| | |
| U.S. Treasury securities | | 999 |
| | 999 |
| | — |
| | — |
| Municipal and other tax-exempt securities | | 40,993 |
| | — |
| | 35,204 |
| | 5,789 |
| U.S. government agency residential mortgage-backed securities | | 5,460,386 |
| | — |
| | 5,460,386 |
| | — |
| Privately issued residential mortgage-backed securities | | 115,535 |
| | — |
| | 115,535 |
| | — |
| Commercial mortgage-backed securities guaranteed by U.S. government agencies | | 3,017,933 |
| | — |
| | 3,017,933 |
| | — |
| Other debt securities | | 4,152 |
| | — |
| | — |
| | 4,152 |
| Perpetual preferred stock | | 18,474 |
| | — |
| | 18,474 |
| | — |
| Equity securities and mutual funds | | 18,357 |
| | 3,495 |
| | 14,862 |
| | — |
| Total available for sale securities | | 8,676,829 |
| | 4,494 |
| | 8,662,394 |
| | 9,941 |
| Fair value option securities – U.S. government agency residential mortgage-backed securities | | 77,046 |
| | — |
| | 77,046 |
| | — |
| Residential mortgage loans held for sale | | 301,897 |
| | — |
| | 290,280 |
| | 11,617 |
| Mortgage servicing rights, net1 | | 247,073 |
| | — |
| | — |
| | 247,073 |
| Derivative contracts, net of cash margin2 | | 689,872 |
| | 7,541 |
| | 682,331 |
| | — |
| Liabilities: | | |
| | |
| | |
| | |
| Derivative contracts, net of cash margin2 | | 664,531 |
| | 6,972 |
| | 657,559 |
| | — |
|
| | 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 7, Mortgage Banking Activities. |
| | 2 | See Note 3 for detail of fair value of derivative contracts by contract type. Derivative contracts in a net asset position that were valued based on quoted prices in active markets or identical instruments (Level 1) are exchange-traded interest rate and energy derivative contracts, net of cash margin. Derivative contracts in a net liability position that were valued using quoted prices in active markets for identical instruments (Level 1) are exchange-traded interest rate, energy and agricultural derivative contracts, net of cash margin. |
The fair value of financial assets and liabilities that are measured on a recurring basis is as follows as of December 31, 2015 (in thousands): | | | | | | | | | | | | | | | | | | | | Total | | Quoted Prices in Active Markets for Identical Instruments | | Significant Other Observable Inputs | | Significant Unobservable Inputs | Assets: | | | | | | | | | Trading securities: | | | | | | | | | U.S. government agency debentures | | $ | 61,295 |
| | $ | — |
| | $ | 61,295 |
| | $ | — |
| U.S. government agency residential mortgage-backed securities | | 10,989 |
| | — |
| | 10,989 |
| | — |
| Municipal and other tax-exempt securities | | 31,901 |
| | — |
| | 31,901 |
| | — |
| Other trading securities | | 18,219 |
| | — |
| | 18,219 |
| | — |
| Total trading securities | | 122,404 |
| | — |
| | 122,404 |
| | — |
| Available for sale securities: | | |
| | |
| | |
| | |
| U.S. Treasury securities | | 995 |
| | 995 |
| | — |
| | — |
| Municipal and other tax-exempt securities | | 56,817 |
| | — |
| | 47,207 |
| | 9,610 |
| U.S. government agency residential mortgage-backed securities | | 5,898,351 |
| | — |
| | 5,898,351 |
| | — |
| Privately issued residential mortgage-backed securities | | 139,118 |
| | — |
| | 139,118 |
| | — |
| Commercial mortgage-backed securities guaranteed by U.S. government agencies | | 2,905,796 |
| | — |
| | 2,905,796 |
| | — |
| Other debt securities | | 4,151 |
| | — |
| | — |
| | 4,151 |
| Perpetual preferred stock | | 19,672 |
| | — |
| | 19,672 |
| | — |
| Equity securities and mutual funds | | 17,833 |
| | 3,265 |
| | 14,568 |
| | — |
| Total available for sale securities | | 9,042,733 |
| | 4,260 |
| | 9,024,712 |
| | 13,761 |
| Fair value option securities – U.S. government agency residential mortgage-backed securities | | 444,217 |
| | — |
| | 444,217 |
| | — |
| Residential mortgage loans held for sale | | 308,439 |
| | — |
| | 300,565 |
| | 7,874 |
| Mortgage servicing rights, net1 | | 218,605 |
| | — |
| | — |
| | 218,605 |
| Derivative contracts, net of cash margin2 | | 586,270 |
| | 38,530 |
| | 547,740 |
| | — |
| Liabilities: | | |
| | |
| | | | | Derivative contracts, net of cash margin 2 | | 581,701 |
| | — |
| | 581,701 |
| | — |
|
| | 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 7, Mortgage Banking Activities. |
| | 2 | See Note 3 for detail of fair value of derivative contracts by contract type. Derivative contracts in a net asset position that were valued based on quoted prices in active markets for identical instruments (Level 1) are exchange-traded energy derivative contracts, net of cash margin. Derivative contracts in a net liability position that were valued using quoted prices in active markets for identical instruments based on quoted prices in active markets for identical instruments (Level 1) are exchange-traded interest rate and agricultural derivative contracts, fully offset by cash margin. |
|
Fair Value of Financial Instruments [Table Text Block] |
The following table presents the carrying values and estimated fair values of all financial instruments, including those financial assets and liabilities that are not measured and reported at fair value on a recurring basis or non-recurring (dollars in thousands): | | | | | | | | | | | | | | | | | | | | December 31, 2016 | | | Carrying Value | | Estimated Fair Value | | Quoted Prices in Active Markets for Identical Instruments (Level 1) | | Significant Other Observable Inputs (Level 2) | | Significant Unobservable Inputs (Level 3) | Cash and due from banks | | $ | 620,846 |
| | 620,846 |
| | 620,846 |
| | — |
| | — |
| Interest-bearing cash and cash equivalents | | 1,916,651 |
| | 1,916,651 |
| | 1,916,651 |
| | — |
| | — |
| Trading securities: | | | | | | | | | | | U.S. government agency debentures | | 6,234 |
| | 6,234 |
| | — |
| | 6,234 |
| | — |
| U.S. government agency residential mortgage-backed securities | | 310,067 |
| | 310,067 |
| | — |
| | 310,067 |
| | — |
| Municipal and other tax-exempt securities | | 14,427 |
| | 14,427 |
| | — |
| | 14,427 |
| | — |
| Other trading securities | | 6,900 |
| | 6,900 |
| | — |
| | 6,900 |
| | — |
| Total trading securities | | 337,628 |
| | 337,628 |
|
| — |
|
| 337,628 |
|
| — |
| Investment securities: | | |
| | | | | | | | |
| Municipal and other tax-exempt securities | | 320,364 |
| | 321,225 |
| | — |
| | 321,225 |
| | — |
| U.S. government agency residential mortgage-backed securities | | 20,777 |
| | 21,473 |
| | — |
| | 21,473 |
| | — |
| Other debt securities | | 205,004 |
| | 222,795 |
| | — |
| | 222,795 |
| | — |
| Total investment securities | | 546,145 |
| | 565,493 |
| | — |
| | 565,493 |
| | — |
| Available for sale securities: | | |
| | | | | | | | |
| U.S. Treasury securities | | 999 |
| | 999 |
| | 999 |
| | — |
| | — |
| Municipal and other tax-exempt securities | | 40,993 |
| | 40,993 |
| | — |
| | 35,204 |
| | 5,789 |
| U.S. government agency residential mortgage-backed securities | | 5,460,386 |
| | 5,460,386 |
| | — |
| | 5,460,386 |
| | — |
| Privately issued residential mortgage-backed securities | | 115,535 |
| | 115,535 |
| | — |
| | 115,535 |
| | — |
| Commercial mortgage-backed securities guaranteed by U.S. government agencies | | 3,017,933 |
| | 3,017,933 |
| | — |
| | 3,017,933 |
| | — |
| Other debt securities | | 4,152 |
| | 4,152 |
| | — |
| | — |
| | 4,152 |
| Perpetual preferred stock | | 18,474 |
| | 18,474 |
| | — |
| | 18,474 |
| | — |
| Equity securities and mutual funds | | 18,357 |
| | 18,357 |
| | 3,495 |
| | 14,862 |
| | — |
| Total available for sale securities | | 8,676,829 |
| | 8,676,829 |
| | 4,494 |
| | 8,662,394 |
| | 9,941 |
| Fair value option securities – U.S. government agency residential mortgage-backed securities | | 77,046 |
| | 77,046 |
| | — |
| | 77,046 |
| | — |
| Residential mortgage loans held for sale | | 301,897 |
| | 301,897 |
| | — |
| | 290,280 |
| | 11,617 |
| Loans: | | |
| | | | | | | | | Commercial | | 10,390,824 |
| | 10,437,016 |
| | — |
| | — |
| | 10,437,016 |
| Commercial real estate | | 3,809,046 |
| | 3,850,981 |
| | — |
| | — |
| | 3,850,981 |
| Residential mortgage | | 1,949,832 |
| | 2,025,159 |
| | — |
| | — |
| | 2,025,159 |
| Personal | | 839,958 |
| | 864,904 |
| | — |
| | — |
| | 864,904 |
| Total loans | | 16,989,660 |
| | 17,178,060 |
| | — | | — |
| | 17,178,060 |
| Allowance for loan losses | | (246,159 | ) | | — |
| | — | | — |
| | — |
| Loans, net of allowance | | 16,743,501 |
| | 17,178,060 |
| | — | | — |
| | 17,178,060 |
| Mortgage servicing rights | | 247,073 |
| | 247,073 |
| | — |
| | — |
| | 247,073 |
| Derivative instruments with positive fair value, net of cash margin | | 689,872 |
| | 689,872 |
| | 7,541 |
| | 682,331 |
| | — |
| Deposits with no stated maturity | | 20,526,295 |
| | 20,526,295 |
| | — |
| | — |
| | 20,526,295 |
| Time deposits | | 2,221,800 |
| | 2,218,303 |
| | — |
| | — |
| | 2,218,303 |
| Other borrowed funds | | 5,572,662 |
| | 5,556,327 |
| | — |
| | — |
| | 5,556,327 |
| Subordinated debentures | | 144,640 |
| | 128,903 |
| | — |
| | 128,903 |
| | — |
| Derivative instruments with negative fair value, net of cash margin | | 664,531 |
| | 664,531 |
| | 6,972 |
| | 657,559 |
| | — |
|
| | | | | | | | | | | | | | | | | | | | | | December 31, 2015 | | | Carrying Value | | Estimated Fair Value | | Quoted Prices in Active Markets for Identical Instruments (Level 1) | | Significant Other Observable Inputs (Level 2) | | Significant Unobservable Inputs (Level 3) | Cash and due from banks | | $ | 573,699 |
| | $ | 573,699 |
| | 573,699 |
| | — |
| | $ | — |
| Interest-bearing cash and cash equivalents | | 2,069,900 |
| | 2,069,900 |
| | 2,069,900 |
| | — |
| | — |
| Trading securities: | | | | | | | | | | | U.S. government agency debentures | | 61,295 |
| | 61,295 |
| | — |
| | 61,295 |
| | — |
| U.S. government agency residential mortgage-backed securities | | 10,989 |
| | 10,989 |
| | — |
| | 10,989 |
| | — |
| Municipal and other tax-exempt securities | | 31,901 |
| | 31,901 |
| | — |
| | 31,901 |
| | — |
| Other trading securities | | 18,219 |
| | 18,219 |
| | — |
| | 18,219 |
| | — |
| Total trading securities | | 122,404 |
| | 122,404 |
| | — |
| | 122,404 |
| | — |
| Investment securities: | | |
| | | | | | | | |
| Municipal and other tax-exempt securities | | 365,258 |
| | 368,910 |
| | — |
| | 368,910 |
| | — |
| U.S. government agency residential mortgage-backed securities | | 26,833 |
| | 27,874 |
| | — |
| | 27,874 |
| | — |
| Other debt securities | | 205,745 |
| | 232,375 |
| | — |
| | 232,375 |
| | — |
| Total investment securities | | 597,836 |
| | 629,159 |
| | — |
| | 629,159 |
| | — |
| Available for sale securities: | | |
| | | | | | | | |
| U.S. Treasury securities | | 995 |
| | 995 |
| | 995 |
| | — |
| | — |
| Municipal and other tax-exempt securities | | 56,817 |
| | 56,817 |
| | — |
| | 47,207 |
| | 9,610 |
| U.S. government agency residential mortgage-backed securities | | 5,898,351 |
| | 5,898,351 |
| | — |
| | 5,898,351 |
| | — |
| Privately issued residential mortgage-backed securities | | 139,118 |
| | 139,118 |
| | — |
| | 139,118 |
| | — |
| Commercial mortgage-backed securities guaranteed by U.S. government agencies | | 2,905,796 |
| | 2,905,796 |
| | — |
| | 2,905,796 |
| | — |
| Other debt securities | | 4,151 |
| | 4,151 |
| | — |
| | — |
| | 4,151 |
| Perpetual preferred stock | | 19,672 |
| | 19,672 |
| | — |
| | 19,672 |
| | — |
| Equity securities and mutual funds | | 17,833 |
| | 17,833 |
| | 3,265 |
| | 14,568 |
| | — |
| Total available for sale securities | | 9,042,733 |
| | 9,042,733 |
| | 4,260 |
| | 9,024,712 |
| | 13,761 |
| Fair value option securities – U.S. government agency residential mortgage-backed securities | | 444,217 |
| | 444,217 |
| | — |
| | 444,217 |
| | — |
| Residential mortgage loans held for sale | | 308,439 |
| | 308,439 |
| | — |
| | 300,565 |
| | 7,874 |
| Loans: | | |
| | | | | | | | | Commercial | | 10,252,531 |
| | 10,053,952 |
| | — |
| | — |
| | 10,053,952 |
| Commercial real estate | | 3,259,033 |
| | 3,233,476 |
| | — |
| | — |
| | 3,233,476 |
| Residential mortgage | | 1,876,893 |
| | 1,902,976 |
| | — |
| | — |
| | 1,902,976 |
| Personal | | 552,697 |
| | 549,068 |
| | — |
| | — |
| | 549,068 |
| Total loans | | 15,941,154 |
| | 15,739,472 |
| | — |
| | — |
| | 15,739,472 |
| Allowance for loan losses | | (225,524 | ) | | — |
| | — |
| | — |
| | — |
| Loans, net of allowance | | 15,715,630 |
| | 15,739,472 |
| | — |
| | — |
| | 15,739,472 |
| Mortgage servicing rights | | 218,605 |
| | 218,605 |
| | — |
| | — |
| | 218,605 |
| Derivative instruments with positive fair value, net of cash margin | | 586,270 |
| | 586,270 |
| | 38,530 |
| | 547,740 |
| | — |
| Deposits with no stated maturity | | 18,682,094 |
| | 18,682,094 |
| | — |
| | — |
| | 18,682,094 |
| Time deposits | | 2,406,064 |
| | 2,394,562 |
| | — |
| | — |
| | 2,394,562 |
| Other borrowed funds | | 6,051,515 |
| | 5,600,932 |
| | — |
| | — |
| | 5,600,932 |
| Subordinated debentures | | 226,350 |
| | 223,758 |
| | — |
| | — |
| | 223,758 |
| Derivative instruments with negative fair value, net of cash margin | | 581,701 |
| | 581,701 |
| | — |
| | 581,701 |
| | — |
|
|