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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net Earnings Available to Common Shareholders                      
Basic earnings per common share                 $ 10,268 $ 9,177 $ 9,633
Effect of dilutive securities: Restricted stock units                 0 0 0
Diluted earnings per common share                 $ 10,268 $ 9,177 $ 9,633
Common Shares                      
Basic earnings per common share (in shares)                 5,988,183 6,024,970 6,115,159
Effect of dilutive securities: Restricted stock units (in shares)                 74,667 77,807 52,749
Diluted earnings per common share (in shares)                 6,062,850 6,102,777 6,167,908
Per Share Amount                      
Basic earnings per common share (in dollars per share) $ 0.34 $ 0.54 $ 0.47 $ 0.36 $ 0.22 $ 0.41 $ 0.49 $ 0.41 $ 1.71 $ 1.53 $ 1.57
Diluted earnings per common share (in dollars per share) $ .34 $ .53 $ .46 $ .36 $ .22 $ .40 $ .48 $ .40 $ 1.69 $ 1.50 $ 1.56