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Income Taxes - Company's Net Deferred Tax Asset Recorded in Other Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Deferred tax assets:    
Allowance for losses and reserve for unfunded commitments $ 37,656 $ 32,519
Deferred compensation 1,534 1,696
Other accrued expenses 3,899 2,720
Additional unfunded status of the supplemental retirement plans 15,434 16,036
Operating lease liability 8,355 8,575
State taxes 3,346 3,649
Share based compensation 1,050 1,132
Nonaccrual interest 706 643
Acquisition cost basis 12,046 14,640
Unrealized loss on securities 68,535 85,897
Tax credits 852 852
Net operating loss carryforwards 953 2,098
Other 190 120
Total deferred tax assets 154,556 170,577
Deferred tax liabilities:    
Securities income (777) (777)
Depreciation (8,364) (8,270)
Right of use asset (7,726) (7,941)
Funded pension liability (3,999) (4,110)
Securities accretion (2,265) (1,265)
Mortgage servicing rights valuation (1,946) (1,976)
Core deposit intangible (2,814) (4,778)
Junior subordinated debt (1,171) (1,293)
Prepaid expenses and other (1,170) (991)
Total deferred tax liability (30,232) (31,401)
Net deferred tax asset $ 124,324 $ 139,176