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Share-Based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Stock option activity        
Options outstanding (in shares)     77,070  
Options exercised (in shares)     (20,000)  
Options outstanding (in shares) 57,070   57,070  
Options vested or expected to vest (in shares) 57,070   57,070  
Options exercisable (in shares) 57,070   57,070  
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)     10.63  
Options Outstanding, weighted average exercise price (in dollars per share) $ 9.86   9.86  
Options vested or expected to vest, weighted average exercise price (in dollars per share) 9.86   9.86  
Options exercisable, weighted average exercise price (in dollars per share) $ 9.86   $ 9.86  
Options outstanding, weighted average remaining contractual term     1 year 21 days  
Options vested or expected to vest, weighted average remaining contractual term     1 year 21 days  
Options exercisable, weighted average remaining contractual term     1 year 21 days  
Options outstanding, aggregate intrinsic value $ 587   $ 587  
Options vested or expected to vest, aggregate intrinsic value 587   587  
Options exercisable, aggregate intrinsic value 587   587  
Intrinsic value of options exercised 204 $ 32 206 $ 381
Cash received from options exercised 212 19 213 228
Excess tax benefit realized for options exercises $ 46 $ 0 $ 46 $ 72
Granted (in shares)     0 0