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Income Taxes - Income Tax Rate Reconciliation (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Amounts      
Income tax at statutory rates $ 7,997,000 $ 6,136,000 $ 5,026,000
State income taxes 1,340,000 1,449,000 695,000
Tax-exempt interest income (396,000) (493,000) (453,000)
Excess compensation 571,000 328,000  
Change in tax law   (326,000)  
Income from bank-owned life insurance (110,000) (107,000) (149,000)
Investments in qualified housing projects (48,000) (82,000) (93,000)
Share-based compensation (83,000) (77,000) (126,000)
Contribution of real property (107,000)    
Merger related expenses   29,000 96,000
Other (205,000) (62,000) 86,000
Income tax expense $ 8,959,000 $ 6,795,000 $ 5,082,000
Percent of Pre-tax Income      
Effective tax rate (as a percent) 21.00% 21.00% 21.00%
State income taxes (as a percent) 3.50% 5.00% 2.90%
Tax-exempt interest income (as a percent) (1.00%) (1.70%) (1.90%)
Excess compensation (as a percent) 1.50% 1.10%  
Change in tax law (as a percent)   (1.10%)  
Income from bank-owned life insurance (as a percent) (0.30%) (0.40%) (0.60%)
Investments in qualified housing projects (as a percent) (0.10%) (0.30%) (0.40%)
Share-based compensation (as a percent) (0.20%) (0.30%) (0.50%)
Contribution of real property (as a percent) (0.30%)    
Merger related expenses   0.10% 0.40%
Other (0.50%) (0.20%) 0.30%
Income tax expense (as a percent) 23.60% 23.20% 21.20%