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Income Taxes | 12 Months Ended
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Dec. 31, 2025
Income Taxes |
Income Taxes | (13) Income Taxes We file a consolidated U.S. Federal and State income tax return. The current and deferred portions of net income tax expense included in the consolidated statements of income are presented below for the years ended December 31: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2025 | ​ | 2024 | ​ | 2023 |
​ | ​ | (Dollars in Thousands) |
Current | ​ ​ ​ | ​ | ​ ​ ​ | ​ ​ ​ | ​ | ​ ​ ​ | ​ ​ ​ | ​ | ​ ​ ​ | ​
U.S. | ​ | $ | 88,333 | ​ | $ | 105,114 | ​ | $ | 82,657 | ​
State | ​ |  | 5,670 | ​ |  | 5,905 | ​ |  | 6,137 | ​
Total current taxes | ​ |  | 94,003 | ​ |  | 111,019 | ​ |  | 88,794 | ​
Deferred | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. | ​ |  | 13,421 | ​ |  | (11,430) | ​ |  | 23,001 | ​
State | ​ |  | 645 | ​ |  | (36) | ​ |  | (51) | ​
Total deferred taxes | ​ |  | 14,066 | ​ |  | (11,466) | ​ |  | 22,950 | ​
Total income taxes | ​ | $ | 108,069 | ​ | $ | 99,553 | ​ | $ | 111,744 | ​
​ The income tax expense differs from the amount computed by applying the U.S. Federal income tax rate of 21% for 2025, 2024, and 2023 to income before income taxes. There were no activities or transactions that had foreign income taxes or cross-border tax effects during 2025, 2024, or 2023. State income/franchise taxes are primarily related to the States of Texas and Oklahoma. Included in the table below is the net tax benefit related to investments in LIHTC projects. Additional information on LIHTC investments can be found in Note 2 – Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments. The reasons for the differences for the years ended December 31 are as follows (Dollars in Thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2025 | ​ | ​ | 2024 | ​ | ​ | 2023 | ​
​ | ​ | ​ | Dollars | ​ | Percent | ​ | ​ | ​ | Dollars | ​ | Percent | ​ | ​ | ​ | Dollars | ​ | Percent | ​
U.S. federal income tax expense computed at the statutory rate | ​ ​ ​ | $ | 109,276 | ​ | 21.0 | % | ​ ​ ​ | $ | 106,831 | ​ | 21.0 | % | ​ ​ ​ | $ | 109,938 | ​ | 21.0 | %
State income/franchise taxes, net of U.S. federal income tax effects (1) | ​ | ​ | 4,989 | ​ | 1.0 | ​ | ​ | ​ | 4,636 | ​ | 0.9 | ​ | ​ | ​ | 4,808 | ​ | 0.9 | ​
Net investment in low income housing investments | ​ |  | (3,451) | ​ | (0.7) | ​ | ​ |  | (2,531) | ​ | (0.5) | ​ | ​ |  | 1,974 | ​ | 0.4 | ​
Non-taxable or non-deductible items | ​ |  | (2,745) | ​ | (0.5) | ​ | ​ |  | (9,383) | ​ | (1.9) | ​ | ​ |  | (4,976) | ​ | (1.0) | ​
Actual tax expense | ​ | $ | 108,069 | ​ | 20.8 | % | ​ | $ | 99,553 | ​ | 19.5 | % | ​ | $ | 111,744 | ​ | 21.4 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(1) State income/franchise taxes, net of U.S. federal income tax effects are related to taxes paid in the States of Texas and Oklahoma | ​
​ The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities at December 31, 2025 and 2024 are reflected below: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2025 | ​ | 2024 |
​ | ​ | (Dollars in Thousands) |
Deferred tax assets: | ​ ​ ​ | ​ | ​ ​ ​ | ​ ​ ​ | ​ | ​ ​ ​ | ​
Loans receivable, principally due to the allowance for probable loan losses | ​ | $ | 41,405 | ​ | $ | 40,883 | ​
Other real estate owned | ​ |  | 1,770 | ​ |  | 1,443 | ​
Accrued expenses | ​ |  | 273 | ​ |  | 539 | ​
Net unrealized losses on available for sale investment securities | ​ | ​ | 68,506 | ​ | ​ | 105,339 | ​
Other | ​ |  | 2,022 | ​ |  | 1,480 | ​
Total deferred tax assets | ​ |  | 113,976 | ​ |  | 149,684 | ​
Deferred tax liabilities: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Bank premises and equipment, principally due to differences on depreciation | ​ |  | (13,477) | ​ |  | (14,648) | ​
Impairment charges on available-for-sale securities | ​ | ​ | (19) | ​ | ​ | (19) | ​
Identified intangible assets and goodwill | ​ |  | (14,151) | ​ |  | (14,151) | ​
Partnership investment pass through | ​ | ​ | (70,529) | ​ | ​ | (55,117) | ​
Other | ​ |  | (5,139) | ​ |  | (4,189) | ​
Total deferred tax liabilities | ​ |  | (103,315) | ​ |  | (88,124) | ​
Net deferred tax asset | ​ | $ | 10,661 | ​ | $ | 61,560 | ​
​ The net deferred tax asset of $10,661,000 and $61,560,000 at December 31, 2025 and December 31, 2024, respectively, is included in other assets in the consolidated statements of condition.

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