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Summary of Significant Accounting Policies (Schedule of Earnings Per Share, Basic and Diluted) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Summary of Significant Accounting Policies [Abstract]                    
Net income $ 7,298 $ 8,312 $ 2,726 $ 2,521 $ 5,124 $ 5,232 $ 5,227 $ 5,451 $ 20,857 $ 21,034
Basic earnings per share- Income available to Common stockholders $ 7,013 $ 7,980 $ 2,385 $ 2,179 $ 4,782 $ 4,890 $ 4,885 $ 5,134 19,557 19,688
Effect of dilutive securities: Stock options                
Diluted earnings per share- Income available to Common stockholders                 $ 19,557 $ 19,688
Basic earnings per share- Income available to Common stockholders, Shares                 17,210 16,367
Effect of dilutive securities: Stock options: Shares                 16 56
Diluted earnings per share- Income available to Common stockholders, Shares                 17,226 16,423
Basic earnings per share- Income available to Common stockholders, Per share amount $ 0.41 $ 0.47 $ 0.14 $ 0.12 $ 0.29 $ 0.30 $ 0.30 $ 0.32 $ 1.14 $ 1.20
Diluted earnings per share - Income available to Common stockholders, Per share amount $ 0.41 $ 0.47 $ 0.14 $ 0.12 $ 0.29 $ 0.30 $ 0.30 $ 0.32 $ 1.14 $ 1.20