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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