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Stock Based Compensation (Summary of Activity For Common Stock Subject To Vesting Requirements) (Details) - Common Stock Subject to Vesting Requirements [Member]
12 Months Ended
Dec. 31, 2021
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding, Option Shares, Beginning Balance | shares 67,151
Number of Shares, Vested | shares (57,779)
Number of Shares, Forfeited | shares (6,427)
Outstanding, Option Shares, Ending Balance | shares 2,945
Weighted Average Grant-Date Fair Value, Nonvested balance | $ / shares $ 18.51
Weighted Average Grant-Date Fair Value, Vested | $ / shares 18.86
Weighted Average Grant-Date Fair Value, Forfeited | $ / shares 16.26
Weighted Average Grant-Date Fair Value, Nonvested balance | $ / shares $ 16.17