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Income Taxes - Components of United's Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Deferred tax assets: |  |
Allowance for credit losses | $ 79,490 | $ 73,315
Accrued benefits payable | 16,514 | 20,256
Other accrued liabilities | 603 | 1,857
Unrealized loss on securities available for sale | 49,091 | 77,189
Other real estate owned | 122 | 127
Lease liabilities under operating leases | 22,799 | 20,738
Income tax credit carryforward | 1,406 | 4,415
Deferred mortgage points | 1,465 | 425
Net operating loss carryforwards | 2,724 | 0
Purchase accounting intangibles | 1,159 | 0
Total deferred tax assets | 175,373 | 198,322
Deferred tax liabilities: |  |
Premises and equipment | 8,937 | 8,307
Right-of-use assets under operating leases | 21,345 | 19,536
Pension plan accruals | 13,050 | 10,743
Derivatives | 7,367 | 10,487
Purchase accounting intangibles | 0 | 6,626
Other | 1,584 | 1,063
Total deferred tax liabilities | 52,283 | 56,762
Net deferred tax assets | $ 123,090 | $ 141,560

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from intangible assets including goodwill. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-6 + Details
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