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Common Stock (Schedule of Non-Vested Restricted Stock) (Details) - 2014 Restricted Stock Plan [Member] - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Shares, Non-vested, Beginning Balance 20,226 19,499  
Shares, Vested (10,637) (9,647)  
Shares, Forfeited 0 (1,876) 0
Shares, Granted 18,450 12,250 10,440
Shares, Non-vested, Ending Balance 28,039 20,226 19,499
Weighted-Average Grant Date Fair Value, Non-vested, Beginning Balance $ 28.76 $ 22.54  
Weighted-Average Grant Date Fair Value, Vested 28.21 22.85  
Weighted-Average Grant Date Fair Value, Forfeited   24.20  
Weighted-Average Grant Date Fair Value, Granted 26.06 33.50  
Weighted-Average Grant Date Fair Value, Non-vested, Ending Balance $ 27.05 $ 28.76 $ 22.54