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Income Taxes - Company's Net Deferred Tax Asset Recorded in Other Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Deferred tax assets:    
Allowance for losses and reserve for unfunded commitments $ 38,837 $ 37,656
Deferred compensation 1,471 1,534
Other accrued expenses 3,881 3,899
Additional unfunded status of the supplemental retirement plans 15,062 15,434
Operating lease liability 7,520 8,355
State taxes 2,814 3,346
Share based compensation 1,200 1,050
Nonaccrual interest 1,477 706
Acquisition cost basis 10,477 12,046
Unrealized loss on securities 69,075 68,535
Tax credits 852 852
Net operating loss carryforwards 1,097 953
Other 136 190
Total deferred tax assets 153,899 154,556
Deferred tax liabilities:    
Securities income (777) (777)
Depreciation (7,696) (8,364)
Right of use asset (6,956) (7,726)
Funded pension liability (4,755) (3,999)
Securities accretion (2,957) (2,265)
Mortgage servicing rights valuation (1,953) (1,946)
Core deposit intangible (1,647) (2,814)
Junior subordinated debt (1,036) (1,171)
Prepaid expenses and other (1,368) (1,170)
Total deferred tax liability (29,145) (30,232)
Net deferred tax asset $ 124,754 $ 124,324