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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Stock option activity        
Options outstanding (in shares)     121,120  
Options exercised (in shares)     (34,950)  
Options forfeited (in shares)     (400)  
Options outstanding (in shares) 85,770   85,770  
Options vested or expected to vest (in shares) 85,770   85,770  
Options exercisable (in shares) 85,770   85,770  
Stock option activity, weighted average exercise price        
Options Outstanding, weighted average exercise price (in dollars per share)     $ 8.73  
Options exercised, weighted average exercise price (in dollars per share)     6.47  
Options forfeited, weighted average exercise price (in dollars per share)     8.02  
Options Outstanding, weighted average exercise price (in dollars per share) $ 9.65   9.65  
Options vested or expected to vest, weighted average exercise price (in dollars per share) 9.65   9.65  
Options exercisable, weighted average exercise price (in dollars per share) $ 9.65   $ 9.65  
Options outstanding, weighted average remaining contractual term     1 year 10 months 9 days  
Options vested or expected to vest, weighted average remaining contractual term     1 year 10 months 9 days  
Options exercisable, weighted average remaining contractual term     1 year 10 months 9 days  
Options outstanding, aggregate intrinsic value $ 475   $ 475  
Options vested or expected to vest, aggregate intrinsic value 475   475  
Options exercisable, aggregate intrinsic value 475   475  
Intrinsic value of options exercised 32 $ 98 381 $ 265
Cash received from options exercised 19 65 228 160
Excess tax benefit realized for options exercises $ 0 $ 8 $ 72 $ 25
Granted (in shares)     0 0