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Stock-Based Compensation - Options outstanding (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Shares    
Outstanding, at the beginning of the period 346,381 274,070
Exercised (14,673) (689)
Granted 94,650 73,000
Forfeited (25,631)  
Outstanding, at the end of the period 400,727 346,381
Exercisable at the end of the period 277,339  
Nonvested at the end of the period 123,388  
Weighted Average Exercise Price    
Outstanding, at the beginning of the period $ 16.13 $ 15.88
Exercised 13.64 11.79
Granted 17.70 17.03
Forfeited 17.03  
Outstanding, at the end of the period 16.53 16.13
Exercisable at the end of the period 16.10  
Nonvested at the end of the period 17.51  
Weighted Average Grant Date Fair Value    
Outstanding, at the beginning of the period 4.55 4.46
Exercised 3.74 3.89
Granted 5.07 4.90
Forfeited 4.73  
Outstanding, at the end of the period 4.69 $ 4.55
Exercisable at December 31, 2018 4.52  
Nonvested at December 31, 2018 $ 5.08  
Weighted average remaining contractual life 7 years 1 month 6 days  
Range of exercise prices, lower limit $ 10.36  
Range of exercise prices, upper limit $ 20.89  
Aggregate intrinsic value of options outstanding $ 1,700  
Aggregate intrinsic value of options exercisable 1,300  
Employee stock option    
Weighted Average Grant Date Fair Value    
Allocated Share-based Compensation Expense $ 451 $ 272