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Income Taxes - Effective income tax reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Income Taxes    
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount $ 5,602 $ 3,049
(Decrease) increase in taxes resulting from:    
Net earnings on bank-owned life insurance (167) (147)
Tax-exempt municipal bond income, net of disallowed interest expense (329) (198)
State income tax, net of federal tax benefit 209 (349)
Valuation allowance 553 273
Other (478) 211
Total provision for income taxes $ 5,390 $ 2,839