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Share-Based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Stock option activity        
Options outstanding (in shares)     77,070  
Options exercised (in shares)     (21,285)  
Options outstanding (in shares) 55,785   55,785  
Options exercisable (in shares) 55,785   55,785  
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)     10.44  
Options Outstanding, weighted average exercise price (in dollars per share) $ 9.92   9.92  
Options exercisable, weighted average exercise price (in dollars per share) $ 9.92   $ 9.92  
Options outstanding, weighted average remaining contractual term     9 months 25 days  
Options exercisable, weighted average remaining contractual term     9 months 25 days  
Options outstanding, aggregate intrinsic value $ 650   $ 650  
Options exercisable, aggregate intrinsic value 650   650  
Intrinsic value of options exercised 19 $ 51 225 $ 432
Cash received from options exercised 10 50 222 277
Excess tax benefit realized for options exercises $ 4 $ 6 $ 50 $ 78
Granted (in shares)     0 0