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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Deferred tax assets:    
Allowance for credit losses on loans $ 54,931 $ 28,404
Allowance for credit loss on off-balance sheet ("OBS") credit exposure 1,998 924
Post-retirement benefit 5,485 5,758
Deferred compensation 2,926 384
Purchase accounting adjustments 105,950 0
Depreciation 4,836 1,126
SERP 1,991 1,137
ESOP 0 402
Stock-based compensation 3,694 2,963
Non-accrual interest 807 172
State Net Operating Loss ("NOL") 2,268 0
Federal NOL 1,389 160
Unrealized losses on available for sale debt securities 66,646 57,198
Lease liability 18,489 15,914
Other 4,666 112
Total gross deferred tax assets 276,076 114,654
Deferred tax liabilities:    
Pension expense 10,161 8,997
Contingent consideration 436 283
Deferred loan costs 17,668 11,376
Investment securities, principally due to accretion of discounts 71 66
Purchase accounting adjustments 0 371
Intangibles 2,151 1,620
Originated mortgage servicing rights 129 147
Pension liability adjustments 2,546 1,459
Net unrealized gain on hedging activities 1,641 3,674
Lease right-of-use asset 17,648 15,084
Total gross deferred tax liabilities 52,451 43,077
Net deferred tax asset $ 223,625 $ 71,577