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Income Taxes - Summary of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Deferred tax assets:    
Allowance for credit losses $ 164,781 $ 157,629
Employee benefits 40,597 41,808
Investment securities 23,871 48,652
Net operating loss carryforwards 7,124 9,078
Purchase accounting 40,806 47,932
FDIC special assessment 1,544 10,673
Other 10,556 23,744
Total deferred tax assets 289,279 339,516
Deferred tax liabilities:    
Pension plans 62,547 52,783
Depreciation 13,539 12,314
Other investments 27,369 17,088
Core deposit intangibles 15,683 21,287
Other intangibles 5,302 6,493
Goodwill 10,085 9,322
Other 10,734 15,356
Total deferred tax liabilities 145,259 134,643
Valuation allowance 0 1,263
Net deferred tax asset (included in other assets) $ 144,020 $ 203,610