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Share-Based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Stock option activity    
Options outstanding (in shares) 77,070  
Options exercised (in shares) (100)  
Options outstanding (in shares) 76,970  
Options vested or expected to vest (in shares) 76,970  
Options exercisable (in shares) 76,970  
Stock option activity, weighted average exercise price    
Options Outstanding, weighted average exercise price (in dollars per share) $ 10.06  
Options exercised, weighted average exercise price (in dollars per share) 8.02  
Options Outstanding, weighted average exercise price (in dollars per share) 10.06  
Options vested or expected to vest, weighted average exercise price (in dollars per share) 10.06  
Options exercisable, weighted average exercise price (in dollars per share) $ 10.06  
Options outstanding, weighted average remaining contractual term 1 year 3 months 7 days  
Options vested or expected to vest, weighted average remaining contractual term 1 year 3 months 7 days  
Options exercisable, weighted average remaining contractual term 1 year 3 months 7 days  
Options outstanding, aggregate intrinsic value $ 653  
Options vested or expected to vest, aggregate intrinsic value 653  
Options exercisable, aggregate intrinsic value 653  
Intrinsic value of options exercised 1 $ 349
Cash received from options exercised 1 207
Excess tax benefit realized for options exercises $ 0 $ 72
Granted (in shares) 0 0