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Accounting Policies - Summary of Computation of Basic and Diluted Earnings Per Share (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
Basic earnings per share        
Net income $ 22,173 $ 14,639 $ 42,595 $ 26,294
Weighted average common shares outstanding (in shares) 43,950,501 43,781,249 43,935,111 44,219,880
Basic earnings per share (in USD per share) $ 0.50 $ 0.33 $ 0.97 $ 0.59
Diluted earnings per share        
Net income $ 22,173 $ 14,639 $ 42,595 $ 26,294
Effect of dilutive securities:        
Weighted average common shares outstanding (in shares) 44,111,103 43,802,794 44,092,577 44,286,864
Diluted earnings per share (in USD per share) $ 0.50 $ 0.33 $ 0.97 $ 0.59
Restricted stock        
Effect of dilutive securities:        
Effect of dilutive securities (in shares) 106,175 7,614 104,421 40,017
Stock options        
Effect of dilutive securities:        
Effect of dilutive securities (in shares) 54,427 13,931 53,045 26,967