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Share-Based Compensation - Stock Option Activity (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Stock option activity      
Granted (in shares) 0    
Common Stock      
Stock option activity      
Exercised (in shares) 221,245 73,889  
Stock option activity      
Shares of common stock issued in exchange for stock options and common shares 91,840    
Common shares exchanged 129,405    
Stock Options      
Stock option activity      
Balance at beginning of period (in shares) 337,654 411,543  
Exercised (in shares) 221,245 73,889  
Balance at end of period (in shares) 116,409 337,654 411,543
Options vested and exercisable (in shares) 116,409    
Weighted Average Exercise Price      
Balance at beginning of period (in dollars per share) $ 17.51 $ 17.48  
Exercised (in dollars per share) 17.50 17.36  
Balance at end of period (in dollars per share) 17.53 $ 17.51 $ 17.48
Options vested and exercisable (in dollars per share) $ 17.53    
Remaining Contractual Life      
Options outstanding 8 months 19 days 1 year 8 months 27 days 2 years 8 months 23 days
Options vested and exercisable 8 months 19 days    
Aggregate Intrinsic Value      
Beginning of period $ 2,859,000 $ 5,509,000  
Exercised 2,483,000 973,000  
End of period 1,562,000 2,859,000 $ 5,509,000
Options vested and exercisable 1,562,000    
Stock option activity      
Intrinsic value of stock options exercised 2,483,000 973,000  
Proceeds received from stock options exercised 3,873,000 1,283,000  
Tax benefits realized from stock options exercised 534,000 229,000  
Total fair value of stock options that vested   $ 35,000  
Unrecognized compensation costs $ 0