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Stock-Based Compensation Plans and Employee Benefits (Restricted Stock Unit Activity) (Details) - Restricted Stock Units (RSUs) [Member]
shares in Thousands, $ in Millions
9 Months Ended
Sep. 30, 2021
USD ($)
shares
Number of Shares  
Non-vested at beginning of period (in shares) 531
Granted (in shares) 372
Vested (in shares) (112)
Forfeited (in shares) (32)
Non-vested at end of period (in shares) 759
Unrecognized compensation cost | $ $ 6.8
Weighted-average period to recognize the unrecognized compensation cost 1 year 4 months 6 days