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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2022
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 measured on a recurring basis was as follows as of June 30, 2022 (in thousands):
|  | Total |  | Quoted Prices in Active Markets for Identical Instruments (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Assets: |  |  |  |  |  |  |  |
Trading securities: |  |  |  |  |  |  |  |
U.S. government securities |  | $ | 8,357 |  |  | $ | 8,357 |  |  | $ | — |  |  | $ | — |
Residential agency mortgage-backed securities |  | 2,807,950 |  |  | — |  |  | 2,807,950 |  |  | — |
Municipal securities |  | 18,825 |  |  | — |  |  | 18,825 |  |  | — |
Other trading securities |  | 24,312 |  |  | — |  |  | 24,312 |  |  | — |
Total trading securities |  | 2,859,444 |  |  | 8,357 |  |  | 2,851,087 |  |  | — |
Available for sale securities: |  |  |  |  |  |  |  |
U.S. Treasury |  | 927 |  |  | 927 |  |  | — |  |  | — |
Municipal securities |  | 638,305 |  |  | — |  |  | 638,305 |  |  | — |
Residential agency mortgage-backed securities |  | 4,913,245 |  |  | — |  |  | 4,913,245 |  |  | — |
Residential non-agency mortgage-backed securities |  | 519,613 |  |  | — |  |  | 519,613 |  |  | — |
Commercial agency mortgage-backed securities |  | 4,080,101 |  |  | — |  |  | 4,080,101 |  |  | — |
Other debt securities |  | 472 |  |  | — |  |  | — |  |  | 472 |
Total available for sale securities |  | 10,152,663 |  |  | 927 |  |  | 10,151,264 |  |  | 472 |
Fair value option securities – Residential agency mortgage-backed securities |  | 37,927 |  |  | — |  |  | 37,927 |  |  | — |
Residential mortgage loans held for sale 1 |  | 182,726 |  |  | — |  |  | 174,600 |  |  | 8,126 |
Mortgage servicing rights 2 |  | 270,312 |  |  | — |  |  | — |  |  | 270,312 |
Derivative contracts, net of cash collateral |  | 1,992,977 |  |  | — |  |  | 1,992,977 |  |  | — |
Liabilities: |  |  |  |  |  |  |  |
Derivative contracts, net of cash collateral |  | 214,576 |  |  | — |  |  | 214,576 |  |  | — |
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 86.67% 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 5, Mortgage Banking Activities. The fair value of financial assets and liabilities measured on a recurring basis was as follows as of December 31, 2021 (in thousands):
|  | Total |  | Quoted Prices in Active Markets for Identical Instruments (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Assets: |  |  |  |  |  |  |  |
Trading securities: |  |  |  |  |  |  |  |
U.S. government securities |  | $ | 23,610 |  |  | $ | 4,999 |  |  | $ | 18,611 |  |  | $ | — |
Residential agency mortgage-backed securities |  | 9,068,900 |  |  | — |  |  | 9,068,900 |  |  | — |
Municipal securities |  | 25,783 |  |  | — |  |  | 25,783 |  |  | — |
Other trading securities |  | 18,520 |  |  | — |  |  | 18,520 |  |  | — |
Total trading securities |  | 9,136,813 |  |  | 4,999 |  |  | 9,131,814 |  |  | — |
Available for sale securities: |  |  |  |  |  |  |  |
U.S. Treasury |  | 1,000 |  |  | 1,000 |  |  | — |  |  | — |
Municipal securities |  | 508,365 |  |  | — |  |  | 508,365 |  |  | — |
Residential agency mortgage-backed securities |  | 8,006,616 |  |  | — |  |  | 8,006,616 |  |  | — |
Residential non-agency mortgage-backed securities |  | 24,339 |  |  | — |  |  | 24,339 |  |  | — |
Commercial agency mortgage-backed securities |  | 4,617,025 |  |  | — |  |  | 4,617,025 |  |  | — |
Other debt securities |  | 472 |  |  | — |  |  | — |  |  | 472 |
Total available for sale securities |  | 13,157,817 |  |  | 1,000 |  |  | 13,156,345 |  |  | 472 |
Fair value option securities — Residential agency mortgage-backed securities |  | 43,770 |  |  | — |  |  | 43,770 |  |  | — |
Residential mortgage loans held for sale 1 |  | 192,295 |  |  | — |  |  | 185,969 |  |  | 6,326 |
Mortgage servicing rights 2 |  | 163,198 |  |  | — |  |  | — |  |  | 163,198 |
Derivative contracts, net of cash collateral |  | 1,097,297 |  |  | 8,331 |  |  | 1,088,966 |  |  | — |
Liabilities: |  |  |  |  |  |  |  |
Derivative contracts, net of cash collateral |  | 275,625 |  |  | — |  |  | 275,625 |  |  | — |
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 95.07% 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 5, Mortgage Banking Activities.
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) during the period. The carrying value represents only those assets with a balance at June 30, 2022 for which the fair value was adjusted during the six months ended June 30, 2022:
|  |  |  |  |  |  | Fair Value Adjustments for the
| Carrying Value at June 30, 2022 |  | Three Months Ended Jun. 30, 2022 Recognized in: |  | Six Months Ended Jun. 30, 2022 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 |  | Other gains (losses), net |  | Gross charge-offs against allowance for loan losses |  | Other gains (losses), net
Nonaccruing loans | $ | — |  |  | $ | 99 |  |  | $ | 126 |  |  | $ | — |  |  | $ | — |  |  | $ | 478 |  |  | $ | — |
Real estate and other repossessed assets | — |  |  | 1,412 |  |  | 1,699 |  |  | — |  |  | (5,811) |  |  | — |  |  | (5,705) |
The following represents the carrying value of assets measured at fair value on a non-recurring basis (and related losses) during the period. The carrying value represents only those assets with a balance at June 30, 2021 for which the fair value was adjusted during the six months ended June 30, 2021:
|  |  |  |  |  |  | Fair Value Adjustments for the
| Carrying Value at June 30, 2021 |  | Three Months Ended Jun. 30, 2021 Recognized in: |  | Six Months Ended Jun. 30, 2021 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 |  | Other gains (losses), net |  | Gross charge-offs against allowance for loan losses |  | Other gains (losses), net
Nonaccruing loans | $ | — |  |  | $ | 4,730 |  |  | $ | 42,453 |  |  | $ | 17,362 |  |  | $ | — |  |  | $ | 24,721 |  |  | $ | — |
Real estate and other repossessed assets | — |  |  | 1,706 |  |  | 36,010 |  |  | — |  |  | (3,966) |  |  | — |  |  | (6,166) |
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 June 30, 2022 follows (in thousands):
|  | Fair Value |  | Valuation Technique(s) |  | Unobservable Input |  | Range (Weighted Average)
Nonaccruing loans |  | $ | 126 |  |  | Discounted cash flows |  | Management knowledge of industry and non-real estate collateral including but not limited to recoverable oil and gas reserves, forward-looking commodity prices, estimated operating costs |  | 25% - 25% (25%)1
Real estate and other repossessed assets |  | 1,699 |  |  | Discounted cash flows |  | Management knowledge of industry and non-real estate collateral. |  | 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 June 30, 2021 follows (in thousands):
|  | Fair Value |  | Valuation Technique(s) |  | Unobservable Input |  | Range (Weighted Average)
Nonaccruing loans |  | $ | 42,453 |  |  | Discounted cash flows |  | Management knowledge of industry and non-real estate collateral including but not limited to recoverable oil and gas reserves, forward-looking commodity prices, estimated operating costs |  | 4% - 96% (47%)1
Real estate and other repossessed assets |  | 36,010 |  |  | Discounted cash flows |  | Management knowledge of industry and non-real estate collateral including but not limited to recoverable oil and gas reserves, forward-looking commodity prices, estimated operating costs |  | N/A
1 Represents fair value as a percentage of the unpaid principal balance.
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 basis as of June 30, 2022 (dollars in thousands):
|  | 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 |  | $ | 1,313,563 |  |  | $ | 1,313,563 |  |  | $ | 1,313,563 |  |  | $ | — |  |  | $ | — |
Interest-bearing cash and cash equivalents |  | 723,787 |  |  | 723,787 |  |  | 723,787 |  |  | — |  |  | — |
Trading securities: |  |  |  |  |  |  |  |  |  |
U.S. government securities |  | 8,357 |  |  | 8,357 |  |  | 8,357 |  |  | — |  |  | — |
Residential agency mortgage-backed securities |  | 2,807,950 |  |  | 2,807,950 |  |  | — |  |  | 2,807,950 |  |  | — |
Municipal securities |  | 18,825 |  |  | 18,825 |  |  | — |  |  | 18,825 |  |  | — |
Other trading securities |  | 24,312 |  |  | 24,312 |  |  | — |  |  | 24,312 |  |  | — |
Total trading securities |  | 2,859,444 |  |  | 2,859,444 |  |  | 8,357 |  |  | 2,851,087 |  |  | — |
Investment securities: |  |  |  |  |  |  |  |  |  |
Municipal securities |  | 175,974 |  |  | 180,783 |  |  | — |  |  | 41,498 |  |  | 139,285 |
Residential agency mortgage-backed securities |  | 2,445,845 |  |  | 2,410,926 |  |  | — |  |  | 2,410,926 |  |  | — |
Commercial agency mortgage-backed securities |  | 15,455 |  |  | 15,279 |  |  | — |  |  | 15,279 |  |  | — |
Other debt securities |  | 788 |  |  | 769 |  |  | — |  |  | 769 |  |  | — |
Total investment securities |  | 2,638,062 |  |  | 2,607,757 |  |  | — |  |  | 2,468,472 |  |  | 139,285 |
Allowance for credit losses |  | (717) |  |  | — |  |  | — |  |  | — |  |  | — |
Investment securities, net of allowance |  | 2,637,345 |  |  | 2,607,757 |  |  | — |  |  | 2,468,472 |  |  | 139,285 |
Available for sale securities: |  |  |  |  |  |  |  |  |  |
U.S. Treasury |  | 927 |  |  | 927 |  |  | 927 |  |  | — |  |  | — |
Municipal securities |  | 638,305 |  |  | 638,305 |  |  | — |  |  | 638,305 |  |  | — |
Residential agency mortgage-backed securities |  | 4,913,245 |  |  | 4,913,245 |  |  | — |  |  | 4,913,245 |  |  | — |
Residential non-agency mortgage-backed securities |  | 519,613 |  |  | 519,613 |  |  | — |  |  | 519,613 |  |  | — |
Commercial agency mortgage-backed securities |  | 4,080,101 |  |  | 4,080,101 |  |  | — |  |  | 4,080,101 |  |  | — |
Other debt securities |  | 472 |  |  | 472 |  |  | — |  |  | — |  |  | 472 |
Total available for sale securities |  | 10,152,663 |  |  | 10,152,663 |  |  | 927 |  |  | 10,151,264 |  |  | 472 |
Fair value option securities – Residential agency mortgage-backed securities |  | 37,927 |  |  | 37,927 |  |  | — |  |  | 37,927 |  |  | — |
Residential mortgage loans held for sale |  | 182,726 |  |  | 182,726 |  |  | — |  |  | 174,600 |  |  | 8,126 |
Loans: |  |  |  |  |  |  |  |  |  |
Commercial |  | 13,578,697 |  |  | 13,334,931 |  |  | — |  |  | — |  |  | 13,334,931 |
Commercial real estate |  | 4,106,148 |  |  | 3,991,292 |  |  | — |  |  | — |  |  | 3,991,292 |
Paycheck protection program |  | 43,140 |  |  | 43,140 |  |  | — |  |  | — |  |  | 43,140 |
Loans to individuals |  | 3,563,163 |  |  | 3,422,548 |  |  | — |  |  | — |  |  | 3,422,548 |
Total loans |  | 21,291,148 |  |  | 20,791,911 |  |  | — |  |  | — |  |  | 20,791,911 |
Allowance for loan losses |  | (241,114) |  |  | — |  |  | — |  |  | — |  |  | — |
Loans, net of allowance |  | 21,050,034 |  |  | 20,791,911 |  |  | — |  |  | — |  |  | 20,791,911 |
Mortgage servicing rights |  | 270,312 |  |  | 270,312 |  |  | — |  |  | — |  |  | 270,312 |
Derivative instruments with positive fair value, net of cash collateral |  | 1,992,977 |  |  | 1,992,977 |  |  | — |  |  | 1,992,977 |  |  | — |
Deposits with no stated maturity |  | 37,249,319 |  |  | 37,249,319 |  |  | — |  |  | — |  |  | 37,249,319 |
Time deposits |  | 1,369,599 |  |  | 1,346,175 |  |  | — |  |  | — |  |  | 1,346,175 |
Other borrowed funds |  | 712,535 |  |  | 710,004 |  |  | — |  |  | — |  |  | 710,004 |
Subordinated debentures |  | 131,223 |  |  | 130,136 |  |  | — |  |  | 130,136 |  |  | — |
Derivative instruments with negative fair value, net of cash collateral |  | 214,576 |  |  | 214,576 |  |  | — |  |  | 214,576 |  |  | — |
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 basis as of December 31, 2021 (dollars in thousands):
|  | 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 |  | $ | 712,067 |  |  | $ | 712,067 |  |  | $ | 712,067 |  |  | $ | — |  |  | $ | — |
Interest-bearing cash and cash equivalents |  | 2,125,343 |  |  | 2,125,343 |  |  | 2,125,343 |  |  | — |  |  | — |
Trading securities: |  |  |  |  |  |  |  |  |  |
U.S. government securities |  | 23,610 |  |  | 23,610 |  |  | 4,999 |  |  | 18,611 |  |  | — |
Residential agency mortgage-backed securities |  | 9,068,900 |  |  | 9,068,900 |  |  | — |  |  | 9,068,900 |  |  | — |
Municipal securities |  | 25,783 |  |  | 25,783 |  |  | — |  |  | 25,783 |  |  | — |
Other trading securities |  | 18,520 |  |  | 18,520 |  |  | — |  |  | 18,520 |  |  | — |
Total trading securities |  | 9,136,813 |  |  | 9,136,813 |  |  | 4,999 |  |  | 9,131,814 |  |  | — |
Investment securities: |  |  |  |  |  |  |  |  |  |
Municipal securities |  | 203,772 |  |  | 223,609 |  |  | — |  |  | 57,698 |  |  | 165,911 |
Residential agency mortgage-backed securities |  | 6,939 |  |  | 7,500 |  |  | — |  |  | 7,500 |  |  | — |
Other debt securities |  | 288 |  |  | 286 |  |  | — |  |  | 286 |  |  | — |
Total investment securities |  | 210,999 |  |  | 231,395 |  |  | — |  |  | 65,484 |  |  | 165,911 |
Allowance for credit losses |  | (555) |  |  | — |  |  | — |  |  | — |  |  | — |
Investment securities, net of allowance |  | 210,444 |  |  | 231,395 |  |  | — |  |  | 65,484 |  |  | 165,911 |
Available for sale securities: |  |  |  |  |  |  |  |  |  |
U.S. Treasury |  | 1,000 |  |  | 1,000 |  |  | 1,000 |  |  | — |  |  | — |
Municipal securities |  | 508,365 |  |  | 508,365 |  |  | — |  |  | 508,365 |  |  | — |
Residential agency mortgage-backed securities |  | 8,006,616 |  |  | 8,006,616 |  |  | — |  |  | 8,006,616 |  |  | — |
Residential non-agency mortgage-backed securities |  | 24,339 |  |  | 24,339 |  |  | — |  |  | 24,339 |  |  | — |
Commercial agency mortgage-backed securities |  | 4,617,025 |  |  | 4,617,025 |  |  | — |  |  | 4,617,025 |  |  | — |
Other debt securities |  | 472 |  |  | 472 |  |  | — |  |  | — |  |  | 472 |
Total available for sale securities |  | 13,157,817 |  |  | 13,157,817 |  |  | 1,000 |  |  | 13,156,345 |  |  | 472 |
Fair value option securities — Residential agency mortgage-backed securities |  | 43,770 |  |  | 43,770 |  |  | — |  |  | 43,770 |  |  | — |
Residential mortgage loans held for sale |  | 192,295 |  |  | 192,295 |  |  | — |  |  | 185,969 |  |  | 6,326 |
Loans: |  |  |  |  |  |  |  |  |  |
Commercial |  | 12,506,465 |  |  | 12,395,664 |  |  | — |  |  | — |  |  | 12,395,664 |
Commercial real estate |  | 3,831,325 |  |  | 3,786,767 |  |  | — |  |  | — |  |  | 3,786,767 |
Paycheck protection program |  | 276,341 |  |  | 269,912 |  |  | — |  |  | — |  |  | 269,912 |
Loans to individuals |  | 3,591,549 |  |  | 3,586,878 |  |  | — |  |  | — |  |  | 3,586,878 |
Total loans |  | 20,205,680 |  |  | 20,039,221 |  |  | — |  |  | — |  |  | 20,039,221 |
Allowance for loan losses |  | (256,421) |  |  | — |  |  | — |  |  | — |  |  | — |
Loans, net of allowance |  | 19,949,259 |  |  | 20,039,221 |  |  | — |  |  | — |  |  | 20,039,221 |
Mortgage servicing rights |  | 163,198 |  |  | 163,198 |  |  | — |  |  | — |  |  | 163,198 |
Derivative instruments with positive fair value, net of cash collateral |  | 1,097,297 |  |  | 1,097,297 |  |  | 8,331 |  |  | 1,088,966 |  |  | — |
Deposits with no stated maturity |  | 39,537,731 |  |  | 39,537,731 |  |  | — |  |  | — |  |  | 39,537,731 |
Time deposits |  | 1,704,328 |  |  | 1,703,886 |  |  | — |  |  | — |  |  | 1,703,886 |
Other borrowed funds |  | 2,363,202 |  |  | 2,360,746 |  |  | — |  |  | — |  |  | 2,360,746 |
Subordinated debentures |  | 131,226 |  |  | 141,761 |  |  | — |  |  | 141,761 |  |  | — |
Derivative instruments with negative fair value, net of cash collateral |  | 275,625 |  |  | 275,625 |  |  | — |  |  | 275,625 |  |  | — |

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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=123874694&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=123874694&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=123874694&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=123594938&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=123874694&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=123874694&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=123874694&loc=d3e19207-110258 + Details
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