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Stock-Based Compensation - Summary of RSU Activity (Details) - Service-Based RSUs - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Weighted Average Grant Date Fair Value      
Beginning of year - Weighted Average Grant Date Fair Value $ 27.66    
Granted - Weighted Average Grant Date Fair Value 27.94    
Released - Weighted Average Grant Date Fair Value 26.86    
Forfeited - Weighted Average Grant Date Fair Value 28.75    
End of year - Weighted Average Grant Date Fair Value $ 28.13 $ 27.66  
Officers, Key Employees, and Non-employee Directors      
Units      
Outstanding at beginning of year - Units 364,396    
Granted - Units 120,546    
Released - Units (100,830)    
Forfeited - Units (16,684)    
Outstanding at end of year - Units 367,428 364,396  
Releasable - Units 203,574    
Weighted Average Grant Date Fair Value      
Beginning of year - Weighted Average Grant Date Fair Value $ 19.87    
Granted - Weighted Average Grant Date Fair Value 27.94 $ 28.61 $ 26.95
Released - Weighted Average Grant Date Fair Value 22.90    
Forfeited - Weighted Average Grant Date Fair Value 28.75    
End of year - Weighted Average Grant Date Fair Value 21.28 $ 19.87  
Releasable - Weighted Average Grant Date Fair Value $ 15.77    
Intrinsic value of RSUs released $ 2,503 $ 2,155 $ 4,015
Weighted Average Remaining Contractual Term      
Outstanding - Weighted Average Remaining Contractual Term 19 years 8 months 8 days    
Releasable - Weighted Average Remaining Contractual Term 30 years 7 months 28 days    
Aggregate Intrinsic Value      
Outstanding - Aggregate Intrinsic Value $ 12,614    
Releasable - Aggregate Intrinsic Value $ 6,989