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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2020
Fair Value Disclosures [Abstract] |
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, 2020 (in thousands):
|  | Total |  | Quoted Prices in Active Markets for Identical Instruments |  | Significant Other Observable Inputs |  | Significant Unobservable Inputs
Assets: |  |  |  |  |  |  |  |
Trading securities: |  |  |  |  |  |  |  |
U.S. government securities |  | $ | 9,183 |  |  | $ | 4,999 |  |  | $ | 4,184 |  |  | $ | — |
Residential agency mortgage-backed securities |  | 4,669,148 |  |  | — |  |  | 4,669,148 |  |  | — |
Municipal securities |  | 19,172 |  |  | — |  |  | 19,172 |  |  | — |
Other trading securities |  | 10,472 |  |  | — |  |  | 10,472 |  |  | — |
Total trading securities |  | 4,707,975 |  |  | 4,999 |  |  | 4,702,976 |  |  | — |
Available for sale securities: |  |  |  |  |  |  |  |
U.S. Treasury |  | 508 |  |  | 508 |  |  | — |  |  | — |
Municipal securities |  | 167,979 |  |  | — |  |  | 167,979 |  |  | — |
Residential agency mortgage-backed securities |  | 9,340,471 |  |  | — |  |  | 9,340,471 |  |  | — |
Residential non-agency mortgage-backed securities |  | 32,770 |  |  | — |  |  | 32,770 |  |  | — |
Commercial agency mortgage-backed securities |  | 3,508,465 |  |  | — |  |  | 3,508,465 |  |  | — |
Other debt securities |  | 472 |  |  | — |  |  | — |  |  | 472 |
Total available for sale securities |  | 13,050,665 |  |  | 508 |  |  | 13,049,685 |  |  | 472 |
Fair value option securities — Residential agency mortgage-backed securities |  | 114,982 |  |  | — |  |  | 114,982 |  |  | — |
Residential mortgage loans held for sale 1 |  | 252,316 |  |  | — |  |  | 245,299 |  |  | 7,017 |
Mortgage servicing rights, net 2 |  | 101,172 |  |  | — |  |  | — |  |  | 101,172 |
Derivative contracts, net of cash margin 3 |  | 810,688 |  |  | 10,780 |  |  | 799,908 |  |  | — |
Liabilities: |  |  |  |  |  |  |  |
Derivative contracts, net of cash margin 3 |  | 405,779 |  |  | — |  |  | 405,779 |  |  | — |
1 Residential mortgage loans held for sale measured at fair value on a recurring basis using significant unobservable inputs (Level 3) consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards and are valued at 94.57% of the unpaid principal balance. 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 7, Mortgage Banking Activities. 3 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 derivative contracts. Derivative contracts in liability positions that were valued using quoted prices in active markets for identical instruments are exchange-traded interest rate, energy and agricultural derivative contracts, fully offset by cash margin. The fair value of financial assets and liabilities that are measured on a recurring basis is as follows as of December 31, 2019 (in thousands):
|  | Total |  | Quoted Prices in Active Markets for Identical Instruments |  | Significant Other Observable Inputs |  | Significant Unobservable Inputs
Assets: |  |  |  |  |  |  |  |
Trading securities: |  |  |  |  |  |  |  |
U.S. government securities |  | $ | 44,264 |  |  | $ | — |  |  | $ | 44,264 |  |  | $ | — |
Residential agency mortgage-backed securities |  | 1,504,651 |  |  | — |  |  | 1,504,651 |  |  | — |
Municipal securities |  | 26,196 |  |  | — |  |  | 26,196 |  |  | — |
Asset-backed securities |  | 14,084 |  |  | — |  |  | 14,084 |  |  | — |
Other trading securities |  | 34,726 |  |  | — |  |  | 34,726 |  |  | — |
Total trading securities |  | 1,623,921 |  |  | — |  |  | 1,623,921 |  |  | — |
Available for sale securities: |  |  |  |  |  |  |  |
U.S. Treasury |  | 1,600 |  |  | 1,600 |  |  | — |  |  | — |
Municipal securities |  | 1,861 |  |  | — |  |  | 1,861 |  |  | — |
Residential agency mortgage-backed securities |  | 8,046,096 |  |  | — |  |  | 8,046,096 |  |  | — |
Residential non-agency mortgage-backed securities |  | 41,609 |  |  | — |  |  | 41,609 |  |  | — |
Commercial agency mortgage-backed securities |  | 3,178,005 |  |  | — |  |  | 3,178,005 |  |  | — |
Other debt securities |  | 472 |  |  | — |  |  | — |  |  | 472 |
Total available for sale securities |  | 11,269,643 |  |  | 1,600 |  |  | 11,267,571 |  |  | 472 |
Fair value option securities: |  |  |  |  |  |  |  |
U.S. Treasury |  | 9,917 |  |  | 9,917 |  |  | — |  |  | — |
Residential agency mortgage-backed securities |  | 1,088,660 |  |  | — |  |  | 1,088,660 |  |  | — |
Total fair value option securities |  | 1,098,577 |  |  | 9,917 |  |  | 1,088,660 |  |  | — |
Residential mortgage loans held for sale 1 |  | 182,271 |  |  | — |  |  | 173,958 |  |  | 8,313 |
Mortgage servicing rights, net 2 |  | 201,886 |  |  | — |  |  | — |  |  | 201,886 |
Derivative contracts, net of cash margin 3 |  | 323,375 |  |  | 8,944 |  |  | 314,431 |  |  | — |
Liabilities: |  |  |  |  |  |  |  |
Derivative contracts, net of cash margin 3 |  | 251,128 |  |  | — |  |  | 251,128 |  |  | — |
1 Residential mortgage loans held for sale measured at fair value on a recurring basis using significant unobservable inputs (Level 3) consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards and are valued at 95.23% of the unpaid principal balance. 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 7, Mortgage Banking Activities. 3 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 and energy derivative contracts, net of cash margin. 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 agricultural contracts, fully offset by cash margin.
Fair Value Assets Measured on Nonrecurring Basis [Table Text Block] | The following represents the carrying value of assets measured at fair value on a non-recurring basis and related losses recorded during the year. The carrying value represents only those assets with the balance sheet date for which the fair value was adjusted during the year:
| Carrying Value at December 31, 2020 |  | Fair Value Adjustments for the Year Ended December 31, 2020 Recognized In:
| Quoted Prices in Active Markets for Identical Instruments |  | Significant Other Observable Inputs |  | Significant Unobservable Inputs |  | Gross charge-offs against allowance for loan losses |  | Net losses (gains) and expenses of repossessed assets, net
Nonaccrual loans | $ | — |  |  | $ | 801 |  |  | $ | 20,423 |  |  | $ | 39,299 |  |  | $ | — |
Real estate and other repossessed assets | — |  |  | 18,188 |  |  | 2,842 |  |  | — |  |  | (4,602) |
| Carrying Value at December 31, 2019 |  | Fair Value Adjustments for the Year Ended December 31, 2019 Recognized In:
| Quoted Prices in Active Markets for Identical Instruments |  | Significant Other Observable Inputs |  | Significant Unobservable Inputs |  | Gross charge-offs against allowance for loan losses |  | Net losses (gains) and expenses of repossessed assets, net
Nonaccrual loans | $ | — |  |  | $ | 41 |  |  | $ | 55,665 |  |  | $ | 31,305 |  |  | $ | — |
Real estate and other repossessed assets | — |  |  | 5,986 |  |  | 1,551 |  |  | — |  |  | (461) |
Fair Value Inputs, Fair Value Measured On a Nonrecurring Basis, Quantitative Information [Table Text Block] | A summary of quantitative information about Non-recurring Fair Value Measurements based on Significant Unobservable Inputs (Level 3) as of December 31, 2020 follows (in thousands):
Quantitative Information about Level 3 Non-recurring Fair Value Measurements
|  | Fair Value |  | Valuation Technique(s) |  | Significant Unobservable Input |  | Range (Weighted Average)
Nonaccrual loans |  | $ | 20,423 |  |  | Discounted cash flows |  | Management knowledge of industry and non-real estate collateral including but not limited to recoverable oil & gas reserves, forward looking commodity prices, and estimated operating costs |  | 1% - 91% (23%)1
Real estate and other repossessed assets |  | 2,842 |  |  | Discounted cash flows |  | Management knowledge of industry and non-real estate collateral including but not limited to recoverable oil & gas reserves, forward looking commodity prices, and estimated operating costs |  | N/A
1 Represents fair value as a percentage of the unpaid principal balance. A summary of quantitative information about Non-recurring Fair Value Measurements based on Significant Unobservable Inputs (Level 3) as of December 31, 2019 follows (in thousands):
Quantitative Information about Level 3 Non-recurring Fair Value Measurements
|  | Fair Value |  | Valuation Technique(s) |  | Significant Unobservable Input |  | Range (Weighted Average)
Nonaccrual loans |  | $ | 55,665 |  |  | Discounted cash flows |  | Management knowledge of industry and non-real estate collateral including but not limited to recoverable oil & gas reserves, forward looking commodity prices, and estimated operating costs |  | 4% - 94% (55%)1
Real estate and other repossessed assets |  | 1,551 |  |  | Discounted cash flows |  | Marketability adjustments off appraised value 2 |  | 74% - 86% (84%)
1 Represents fair value as a percentage of the unpaid principal balance. 2 Marketability adjustments include consideration of estimated costs to sell which is approximately 10% of the fair value.
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, 2020
|  | 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 |  | $ | 798,757 |  |  | $ | 798,757 |  |  | $ | 798,757 |  |  | $ | — |  |  | $ | — |
Interest-bearing cash and cash equivalents |  | 381,816 |  |  | 381,816 |  |  | 381,816 |  |  | — |  |  | — |
Trading securities: |  |  |  |  |  |  |  |  |  |
U.S. government securities |  | 9,183 |  |  | 9,183 |  |  | 4,999 |  |  | 4,184 |  |  | — |
Residential agency mortgage-backed securities |  | 4,669,148 |  |  | 4,669,148 |  |  | — |  |  | 4,669,148 |  |  | — |
Municipal securities |  | 19,172 |  |  | 19,172 |  |  | — |  |  | 19,172 |  |  | — |
Other trading securities |  | 10,472 |  |  | 10,472 |  |  | — |  |  | 10,472 |  |  | — |
Total trading securities |  | 4,707,975 |  |  | 4,707,975 |  |  | 4,999 |  |  | 4,702,976 |  |  | — |
Investment securities: |  |  |  |  |  |  |  |  |  |
Municipal securities |  | 229,245 |  |  | 255,270 |  |  | — |  |  | 69,404 |  |  | 185,866 |
Residential agency mortgage-backed securities |  | 8,913 |  |  | 9,790 |  |  | — |  |  | 9,790 |  |  | — |
Other debt securities |  | 7,373 |  |  | 7,371 |  |  | — |  |  | 7,371 |  |  | — |
Total investment securities |  | 245,531 |  |  | 272,431 |  |  | — |  |  | 86,565 |  |  | 185,866 |
Allowance for credit losses |  | (688) |  |  | — |  |  | — |  |  | — |  |  | — |
Investment securities, net of allowance |  | 244,843 |  |  | 272,431 |  |  | — |  |  | 86,565 |  |  | 185,866 |
Available for sale securities: |  |  |  |  |  |  |  |  |  |
U.S. Treasury |  | 508 |  |  | 508 |  |  | 508 |  |  | — |  |  | — |
Municipal securities |  | 167,979 |  |  | 167,979 |  |  | — |  |  | 167,979 |  |  | — |
Residential agency mortgage-backed securities |  | 9,340,471 |  |  | 9,340,471 |  |  | — |  |  | 9,340,471 |  |  | — |
Residential non-agency mortgage-backed securities |  | 32,770 |  |  | 32,770 |  |  | — |  |  | 32,770 |  |  | — |
Commercial agency mortgage-backed securities |  | 3,508,465 |  |  | 3,508,465 |  |  | — |  |  | 3,508,465 |  |  | — |
Other debt securities |  | 472 |  |  | 472 |  |  | — |  |  | — |  |  | 472 |
Total available for sale securities |  | 13,050,665 |  |  | 13,050,665 |  |  | 508 |  |  | 13,049,685 |  |  | 472 |
Fair value option securities — Residential agency mortgage-backed securities |  | 114,982 |  |  | 114,982 |  |  | — |  |  | 114,982 |  |  | — |
Residential mortgage loans held for sale |  | 252,316 |  |  | 252,316 |  |  | — |  |  | 245,299 |  |  | 7,017 |
Loans: |  |  |  |  |  |  |  |  |  |
Commercial |  | 13,077,535 |  |  | 13,003,383 |  |  | — |  |  | — |  |  | 13,003,383 |
Commercial real estate |  | 4,698,538 |  |  | 4,649,763 |  |  | — |  |  | — |  |  | 4,649,763 |
Paycheck protection program |  | 1,682,310 |  |  | 1,669,461 |  |  | — |  |  | — |  |  | 1,669,461 |
Loans to individuals |  | 3,549,137 |  |  | 3,563,199 |  |  | — |  |  | — |  |  | 3,563,199 |
Total loans |  | 23,007,520 |  |  | 22,885,806 |  |  | — |  |  | — |  |  | 22,885,806 |
Allowance for loan losses |  | (388,640) |  |  | — |  |  | — |  |  | — |  |  | — |
Loans, net of allowance |  | 22,618,880 |  |  | 22,885,806 |  |  | — |  |  | — |  |  | 22,885,806 |
Mortgage servicing rights |  | 101,172 |  |  | 101,172 |  |  | — |  |  | — |  |  | 101,172 |
Derivative instruments with positive fair value, net of cash margin |  | 810,688 |  |  | 810,688 |  |  | 10,780 |  |  | 799,908 |  |  | — |
Deposits with no stated maturity |  | 34,176,752 |  |  | 34,176,752 |  |  | — |  |  | — |  |  | 34,176,752 |
Time deposits |  | 1,967,128 |  |  | 1,976,936 |  |  | — |  |  | — |  |  | 1,976,936 |
Other borrowed funds |  | 3,545,356 |  |  | 3,542,489 |  |  | — |  |  | — |  |  | 3,542,489 |
Subordinated debentures |  | 276,005 |  |  | 269,544 |  |  | — |  |  | 269,544 |  |  | — |
Derivative instruments with negative fair value, net of cash margin |  | 405,779 |  |  | 405,779 |  |  | — |  |  | 405,779 |  |  | — |
|  | December 31, 2019
|  | 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 |  | $ | 735,836 |  |  | $ | 735,836 |  |  | $ | 735,836 |  |  | $ | — |  |  | $ | — |
Interest-bearing cash and cash equivalents |  | 522,985 |  |  | 522,985 |  |  | 522,985 |  |  | — |  |  | — |
Trading securities: |  |  |  |  |  |  |  |  |  |
U.S. government securities |  | 44,264 |  |  | 44,264 |  |  | — |  |  | 44,264 |  |  | — |
Residential agency mortgage-backed securities |  | 1,504,651 |  |  | 1,504,651 |  |  | — |  |  | 1,504,651 |  |  | — |
Municipal securities |  | 26,196 |  |  | 26,196 |  |  | — |  |  | 26,196 |  |  | — |
Asset-backed securities |  | 14,084 |  |  | 14,084 |  |  | — |  |  | 14,084 |  |  | — |
Other trading securities |  | 34,726 |  |  | 34,726 |  |  | — |  |  | 34,726 |  |  | — |
Total trading securities |  | 1,623,921 |  |  | 1,623,921 |  |  | — |  |  | 1,623,921 |  |  | — |
Investment securities: |  |  |  |  |  |  |  |  |  |
Municipal securities |  | 274,535 |  |  | 295,032 |  |  | — |  |  | 96,897 |  |  | 198,135 |
Residential agency mortgage-backed securities |  | 10,676 |  |  | 11,164 |  |  | — |  |  | 11,164 |  |  | — |
Other debt securities |  | 8,207 |  |  | 8,206 |  |  | — |  |  | 8,206 |  |  | — |
Total investment securities |  | 293,418 |  |  | 314,402 |  |  | — |  |  | 116,267 |  |  | 198,135 |
Available for sale securities: |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | 1,600 |  |  | 1,600 |  |  | 1,600 |  |  | — |  |  | — |
Municipal securities |  | 1,861 |  |  | 1,861 |  |  | — |  |  | 1,861 |  |  | — |
Residential agency mortgage-backed securities |  | 8,046,096 |  |  | 8,046,096 |  |  | — |  |  | 8,046,096 |  |  | — |
Residential non-agency mortgage-backed securities |  | 41,609 |  |  | 41,609 |  |  | — |  |  | 41,609 |  |  | — |
Commercial agency mortgage-backed securities |  | 3,178,005 |  |  | 3,178,005 |  |  | — |  |  | 3,178,005 |  |  | — |
Other debt securities |  | 472 |  |  | 472 |  |  | — |  |  | — |  |  | 472 |
Total available for sale securities |  | 11,269,643 |  |  | 11,269,643 |  |  | 1,600 |  |  | 11,267,571 |  |  | 472 |
Fair value option securities: |  |  |  |  |  |  |  |  |  |
U.S. Treasury |  | 9,917 |  |  | 9,917 |  |  | 9,917 |  |  | — |  |  | — |
Residential agency mortgage-backed securities |  | 1,088,660 |  |  | 1,088,660 |  |  | — |  |  | 1,088,660 |  |  | — |
Total fair value option securities |  | 1,098,577 |  |  | 1,098,577 |  |  | 9,917 |  |  | 1,088,660 |  |  | — |
Residential mortgage loans held for sale |  | 182,271 |  |  | 182,271 |  |  | — |  |  | 173,958 |  |  | 8,313 |
Loans: |  |  |  |  |  |  |  |  |  |
Commercial |  | 14,031,650 |  |  | 13,966,221 |  |  | — |  |  | — |  |  | 13,966,221 |
Commercial real estate |  | 4,433,783 |  |  | 4,422,717 |  |  | — |  |  | — |  |  | 4,422,717 |
Residential mortgage |  | 2,084,172 |  |  | 2,098,093 |  |  | — |  |  | — |  |  | 2,098,093 |
Personal |  | 1,201,382 |  |  | 1,202,298 |  |  | — |  |  | — |  |  | 1,202,298 |
Total loans |  | 21,750,987 |  |  | 21,689,329 |  |  | — |  |  | — |  |  | 21,689,329 |
Allowance for loan losses |  | (210,759) |  |  | — |  |  | — |  |  | — |  |  | — |
Loans, net of allowance |  | 21,540,228 |  |  | 21,689,329 |  |  | — |  |  | — |  |  | 21,689,329 |
Mortgage servicing rights |  | 201,886 |  |  | 201,886 |  |  | — |  |  | — |  |  | 201,886 |
Derivative instruments with positive fair value, net of cash margin |  | 323,375 |  |  | 323,375 |  |  | 8,944 |  |  | 314,431 |  |  | — |
Deposits with no stated maturity |  | 25,403,319 |  |  | 25,403,319 |  |  | — |  |  | — |  |  | 25,403,319 |
Time deposits |  | 2,217,849 |  |  | 2,212,467 |  |  | — |  |  | — |  |  | 2,212,467 |
Other borrowed funds |  | 8,345,405 |  |  | 8,315,860 |  |  | — |  |  | — |  |  | 8,315,860 |
Subordinated debentures |  | 275,923 |  |  | 284,627 |  |  | — |  |  | 284,627 |  |  | — |
Derivative instruments with negative fair value, net of cash margin |  | 251,128 |  |  | 251,128 |  |  | — |  |  | 251,128 |  |  | — |

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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