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17. Quarterly Data (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
Quarterly Financial Information Disclosure [Abstract]                      
Total interest income $ 12,202 $ 11,868 $ 11,638 $ 12,250 $ 12,613 $ 12,430 $ 12,375 $ 12,183 $ 47,958 $ 49,601 $ 45,350
Total interest expense 941 942 912 1,041 1,225 994 781 757 3,836 3,757 2,146
Net interest income 11,261 10,926 10,726 11,209 11,388 11,436 11,594 11,426 44,122 45,844 43,204
Provision for loan losses 799 522 1,417 1,521 186 422 77 178 4,259 863 790
Other income 5,948 7,132 5,239 4,595 4,526 4,708 4,385 4,120 22,914 17,739 16,166
Other expense 14,116 11,914 11,452 11,449 12,090 11,267 11,244 10,916 48,931 45,517 42,574
Income before income taxes 2,294 5,622 3,096 2,834 3,638 4,455 4,658 4,452 13,846 17,203 16,006
Income tax expense 374 1,113 535 467 672 834 845 785 2,489 3,136 2,624
Net earnings $ 1,920 $ 4,509 $ 2,561 $ 2,367 $ 2,966 $ 3,621 $ 3,813 $ 3,667 $ 11,357 $ 14,067 $ 13,382
Basic net earnings 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 net earnings per share $ 0.33 $ 0.78 $ 0.44 $ 0.4 $ 0.5 $ 0.61 $ 0.64 $ 0.61 $ 1.95 $ 2.36 $ 2.22