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Income Taxes - Schedule of Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Deferred tax assets |  |
Net unrealized losses on investment securities available for sale and cash flow hedges | $ 200,094 | $ 302,128
Allowance for credit losses | 128,700 | 131,373
Lease liability | 96,004 | 111,089
Employee benefits and deferred compensation | 49,986 | 47,642
Net operating loss carryforwards | 31,998 | 32,511
Tax credit carryforwards | 18,450 | 14,143
Non-performing loan interest | 6,974 | 7,923
Merger-related expenses | 6,568 | 0
Unrealized losses on fair value hedges | 3,996 | 4,252
Miscellaneous accrued expenses | 3,233 | 4,948
FDIC special assessment | 1,335 | 9,087
Fair value of investment securities and loans | 0 | 1
Other | 4,233 | 8,167
Total gross deferred tax assets | 551,571 | 673,264
Less valuation allowance | (27,776) | (27,483)
Total deferred tax assets | 523,795 | 645,781
Deferred tax liabilities |  |
Right-of-use asset | (88,727) | (104,190)
Purchase accounting intangibles | (21,649) | (22,535)
Deferred loan costs | (16,281) | (16,293)
Surrender of BOLI policies | (14,227) | 0
Excess tax over financial statement depreciation | (13,762) | (13,685)
Unrealized gain on hedged liabilities | (11,013) | (4,252)
Prepaid expense | (7,796) | (5,498)
Partnership investments | (2,304) | (2,995)
Other properties held for sale | (205) | (914)
Other | (6,153) | (4,899)
Total gross deferred tax liabilities | (182,117) | (175,261)
Net deferred tax asset | $ 341,678 | $ 470,520

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