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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Deferred tax assets:    
Allowance for credit losses on loans $ 51,650 $ 54,931
Allowance for credit loss on off-balance sheet ("OBS") credit exposure 1,915 1,998
Post-retirement benefit 4,534 5,485
Deferred compensation 3,420 2,926
Purchase accounting adjustments 54,228 105,950
Depreciation 5,661 4,836
SERP 1,146 1,991
Accrued Bonus 5,569 0
Stock-based compensation 3,143 3,694
Non-accrual interest 674 807
State Net Operating Loss ("NOL") 9,018 2,268
Federal NOL 15,855 1,389
Capital Loss Carryforward 600 0
Unrealized losses on available for sale debt securities 28,531 66,646
Net unrealized loss on hedging activities 625 0
Lease liability 17,086 18,489
Other 4,678 4,666
Total gross deferred tax assets 208,333 276,076
Deferred tax liabilities:    
Pension expense 10,608 10,161
Contingent consideration 560 436
Deferred loan costs 11,651 17,668
Investment securities, principally due to accretion of discounts 101 71
Intangibles 2,479 2,151
Originated mortgage servicing rights 111 129
Pension liability adjustments 1,191 2,546
Net unrealized gain on hedging activities 0 1,641
Lease right-of-use asset 16,196 17,648
Total gross deferred tax liabilities 42,897 52,451
Net deferred tax asset $ 165,436 $ 223,625