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Employee Benefits - Restricted Stock Awards and Stock Option Grant (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Defined Contribution Plan [Line Items]    
Number of Stock Options Granted (in shares) 15,000 5,000
Restricted Stock    
Defined Contribution Plan [Line Items]    
Number of Restricted Shares Granted 42,100 33,350
2015 Equity Incentive Plan    
Defined Contribution Plan [Line Items]    
Weighted Average Grant Date Common Stock Price (in dollars per share) $ 20.17 $ 30.32
Restricted Shares Market Value Before Tax $ 849,000 $ 1,011,000
Number of Stock Options Granted (in shares) 15,000 5,000
Stock Options Market Value Before Tax $ 31,000 $ 18,000
2015 Equity Incentive Plan | Restricted Stock    
Defined Contribution Plan [Line Items]    
Number of Restricted Shares Granted 42,100 33,350
2015 Equity Incentive Plan | Stock Options    
Defined Contribution Plan [Line Items]    
Expected Life in Years 6 years 6 months 6 years 6 months
Expected Dividend Yield 5.16% 4.07%
Risk-free Interest Rate 0.28% 2.30%
Expected Volatility 25.80% 23.30%
Weighted Average Grant Date Fair Value (in dollars per share) $ 2.08 $ 3.52