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Employee Benefits (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Employee Benefits [Abstract]        
Percentage of employee's compensation matched by company     5.00%  
Defined benefit plan, employer contribution $ 75,000 $ 69,000 $ 140,000 $ 114,000
Share-based Compensation [Abstract]        
Stock-based compensation expense     473,000 371,000
2018 Equity Incentive Plan [Member]        
Share-based Compensation [Abstract]        
Stock-based compensation expense $ 171,000 $ 191,000 $ 473,000 $ 371,000
Shares available for future grants (in shares) 689,050   689,050  
Unearned stock-based compensation expense [Abstract]        
Risk-free interest rate     0.52% 1.71%
Dividend yield     2.89% 2.20%
Stock price volatility     66.67% 41.27%
Expected term     6 years 4 months 28 days 7 years 6 months 3 days
2018 Equity Incentive Plan [Member] | RSUs [Member]        
Share-based Compensation [Abstract]        
Unrecognized compensation expense $ 1,900,000   $ 1,900,000  
Period for recognition of compensation cost not yet recognized     2 years 9 months 3 days  
Restricted Stock Units [Roll Forward]        
Outstanding, beginning of the period (in shares)     118,000  
Shares granted (in shares)     25,200  
Shares vested (in shares)     (7,582)  
Shares forfeited (in shares)     0  
Outstanding, end of the period (in shares) 135,618   135,618  
Weighted Average Grant Date Fair Value [Abstract]        
Outstanding, beginning of period (in dollars per share)     $ 18.09  
Shares granted (in dollars per share)     14.31  
Shares settled (in dollars per share)     18.02  
Shares forfeited (in dollars per share)     0  
Outstanding, end of period (in dollars per share) $ 17.39   $ 17.39  
2018 Equity Incentive Plan [Member] | Stock Option [Member]        
Share-based Compensation [Abstract]        
Vesting period     4 years  
Unrecognized compensation expense $ 756,000   $ 756,000  
Unvested and/or unexercised stock options (in shares) 265,750   265,750  
Period for recognition of compensation cost not yet recognized     2 years 10 months 17 days  
Stock Option Activity [Roll Forward]        
Outstanding at beginning of period (in shares)     185,250  
Options granted (in shares)     80,500  
Options exercised (in shares)     0  
Options forfeited (in shares)     0  
Outstanding at end of period (in shares) 265,750   265,750  
Exercisable at end of period (in shares) 86,307   86,307  
Weighted Average Exercise Price [Roll Forward]        
Outstanding at beginning of period (in dollars per share)     $ 18.73  
Options granted (in dollars per share)     14.31  
Options exercised (in dollars per share)     0  
Options forfeited (in dollars per share)     0  
Outstanding at end of period (in dollars per share) $ 17.39   17.39  
Exercisable at end of period (in dollars per share) $ 18.75   $ 18.75  
Options, Additional Disclosures [Abstract]        
Weighted average remaining contractual term, Outstanding     8 years 29 days  
Weighted average remaining contractual term, Exercisable     7 years 4 months 13 days  
Aggregate intrinsic value, Outstanding $ 243,720,000   $ 243,720,000  
Aggregate intrinsic value, Exercisable $ 3,525,000   $ 3,525,000  
2018 Equity Incentive Plan [Member] | Minimum [Member] | RSUs [Member]        
Share-based Compensation [Abstract]        
Vesting period     3 years  
2018 Equity Incentive Plan [Member] | Maximum [Member] | RSUs [Member]        
Share-based Compensation [Abstract]        
Vesting period     5 years