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1. Summary of Significant Accounting Policies (Details) - USD ($)
$ / shares in Units, $ 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
Dec. 31, 2018
Net Earnings Available to Common Shareholders                      
Basic earnings per common share                 $ 11,357 $ 14,067 $ 13,382
Effect of dilutive securities: Restricted stock units                 0 0 0
Diluted earnings per common share                 $ 11,357 $ 14,067 $ 13,382
Common Shares                      
Basic earnings per common share (in shares)                 5,808,121 5,941,873 5,995,256
Effect of dilutive securities: Restricted stock units (in shares)                 14,203 25,438 20,240
Diluted earnings per common share (in shares)                 5,822,324 5,967,311 6,015,496
Per Share Amount                      
Basic earnings per common share (in dollars per share) $ 0.33 $ 0.78 $ 0.44 $ 0.4 $ 0.5 $ 0.62 $ 0.64 $ 0.61 $ 1.95 $ 2.37 $ 2.23
Diluted earnings per common share (in dollars per share) $ 0.33 $ 0.78 $ 0.44 $ 0.4 $ 0.5 $ 0.61 $ 0.64 $ 0.61 $ 1.95 $ 2.36 $ 2.22