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Share-Based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Common Stock            
Stock option activity            
Exercised (in shares) 59,280 107,610 81,827 182,170    
Stock option activity            
Shares of common stock issued in exchange for stock options and common shares     27,194      
Common shares exchanged     54,633      
Stock Options            
Stock option activity            
Balance at beginning of period (in shares)     116,409 337,654 337,654  
Exercised (in shares)     81,827 182,170    
Balance at end of period (in shares) 34,582 155,484 34,582 155,484 116,409 337,654
Options vested and exercisable (in shares) 34,582   34,582      
Weighted Average Exercise Price            
Balance at beginning of period (in dollars per share)     $ 17.53 $ 17.51 $ 17.51  
Exercised (in dollars per share)     17.36 17.36    
Balance at end of period (in dollars per share) $ 17.92 $ 17.69 17.92 $ 17.69 $ 17.53 $ 17.51
Options vested and exercisable (in dollars per share) $ 17.92   $ 17.92      
Remaining Contractual Life            
Options outstanding     4 months 6 days 1 year 3 months 29 days 8 months 19 days 1 year 8 months 26 days
Options vested and exercisable     4 months 6 days      
Aggregate Intrinsic Value            
Beginning of period     $ 1,562 $ 2,859 $ 2,859  
Exercised $ 437 $ 1,243 725 2,031    
End of period 203 2,054 203 2,054 $ 1,562 $ 2,859
Options vested and exercisable 203   203      
Stock option activity            
Intrinsic value of stock options exercised 437 1,243 725 2,031    
Proceeds received from stock options exercised 1,029 1,868 1,421 3,162    
Tax benefits realized from stock options exercised 105 $ 254 $ 158 $ 425    
Common shares exchanged     81,827      
Unrecognized compensation costs $ 0   $ 0