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17. Quarterly Data (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]                      
Total interest income $ 12,613 $ 12,430 $ 12,375 $ 12,183 $ 11,924 $ 11,608 $ 11,059 $ 10,759 $ 49,601 $ 45,350 $ 41,949
Total interest expense 1,225 994 781 757 609 557 513 467 3,757 2,146 2,377
Net interest income 11,388 11,436 11,594 11,426 11,315 11,051 10,546 10,292 45,844 43,204 39,572
Provision for loan losses 186 422 77 178 418 110 231 31 863 790 (507)
Other income 4,526 4,708 4,385 4,120 4,499 3,915 4,016 3,736 17,739 16,166 15,364
Other expense 12,090 11,267 11,244 10,916 11,270 10,702 10,560 10,042 45,517 42,574 41,228
Income before income taxes 3,638 4,455 4,658 4,452 4,126 4,154 3,771 3,955 17,203 16,006 14,215
Income tax expense 672 834 845 785 690 687 595 652 3,136 2,624 3,947
Net earnings $ 2,966 $ 3,621 $ 3,813 $ 3,667 $ 3,436 $ 3,467 $ 3,176 $ 3,303 $ 14,067 $ 13,382 $ 10,268
Basic net earnings per share $ 0.5 $ 0.62 $ 0.64 $ 0.61 $ 0.57 $ 0.58 $ 0.53 $ 0.55 $ 2.37 $ 2.23 $ 1.71
Diluted net earnings per share $ 0.5 $ 0.61 $ 0.64 $ 0.61 $ 0.57 $ 0.57 $ 0.53 $ 0.55 $ 2.36 $ 2.22 $ 1.69