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Stock-Based Compensation - Summary of Service-Based Restricted Stock Units (Details) - Officers, key employees, and non-employee directors - Service-Based RSUs
3 Months Ended
Mar. 31, 2021
$ / shares
shares
Units  
Outstanding at beginning of year - Units | shares 367,428
Granted - Units | shares 65,450
Vested and released - Units | shares (61,342)
Forfeited - Units | shares (3,789)
Outstanding at end of year - Units | shares 367,747
Releasable - Units | shares 194,974
Weighted Average Grant Date Fair Value  
Beginning of year - Weighted Average Grant Date Fair Value | $ / shares $ 21.28
Granted - Weighted Average Grant Date Fair Value | $ / shares 32.77
Vested and released - Weighted Average Grant Date Fair Value | $ / shares 28.48
Forfeited - Weighted Average Grant Date Fair Value | $ / shares 27.20
End of year - Weighted Average Grant Date Fair Value | $ / shares 22.07
Releasable - Weighted Average Grant Date Fair Value | $ / shares $ 15.22