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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Income Tax Disclosure [Abstract]    
Allowance for loan losses $ 3,512 $ 3,259
Accrued pension and post-retirement 828 887
Unrealized loss on securities available for sale 11,887 457
Unrealized loss on derivative instruments 1,031 544
Unrealized loss on securities transferred from available for sale to held to maturity 17 23
Restricted stock grants 320 308
Core deposit intangible 34 29
Investment in flow through entities 87 79
Other assets 41 35
Total deferred tax asset 17,757 5,621
Net deferred loan costs (2,285) (2,055)
Depreciation (2,272) (2,334)
Goodwill (267) (214)
Mortgage servicing rights (524) (561)
Unrealized gain on derivative instruments (1,176) (544)
Prepaid expense (252) (295)
Total deferred tax liability (6,776) (6,003)
Net deferred tax asset (liability) $ 10,981  
Net deferred tax asset (liability)   $ (382)