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Income Taxes (Details 1) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income Taxes                      
Tax expense at statutory rate                 $ 4,262,000 $ 3,975,000 $ 2,908,000
Differences:                      
State income tax, net of federal income tax effect                 395,000 339,000 261,000
Tax exempt interest income                 (445,000) (497,000) (649,000)
Increase in cash surrender value of life insurance                 (71,000) (83,000) (80,000)
Tax credits                 (230) (234) (234)
Nondeductible interest and other expense                 24,000 30,000 46,000
Other                 237,000 266,000 237,000
Total income tax $ 1,102,000 $ 1,416,000 $ 806,000 $ 848,000 $ 732,000 $ 824,000 $ 1,194,000 $ 1,046,000 $ 4,172,000 $ 3,796,000 $ 2,489,000