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17. Quarterly Data (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]                      
Total interest income $ 11,924 $ 11,608 $ 11,059 $ 10,759 $ 10,726 $ 10,698 $ 10,461 $ 10,064 $ 45,350 $ 41,949 $ 39,809
Total interest expense 609 557 513 467 507 650 622 598 2,146 2,377 3,271
Net interest income 11,315 11,051 10,546 10,292 10,219 10,048 9,839 9,466 43,204 39,572 36,538
(Reduction of) provision for loan losses 418 110 231 31 (102) (218) 49 (236) 790 (507) (1,206)
Other income 4,499 3,915 4,016 3,736 3,834 4,159 3,929 3,442 16,166 15,364 16,236
Other expense 11,270 10,702 10,560 10,042 10,878 10,006 9,983 10,361 42,574 41,228 42,242
Income before income taxes 4,126 4,154 3,771 3,955 3,277 4,419 3,736 2,783 16,006 14,215 11,738
Income tax expense 690 687 595 652 1,267 1,177 925 578 2,624 3,947 2,561
Net earnings $ 3,436 $ 3,467 $ 3,176 $ 3,303 $ 2,010 $ 3,242 $ 2,811 $ 2,205 $ 13,382 $ 10,268 $ 9,177
Basic net earnings per share $ 0.57 $ 0.58 $ 0.53 $ 0.55 $ 0.34 $ 0.54 $ 0.47 $ 0.36 $ 2.23 $ 1.71 $ 1.53
Diluted net earnings per share $ 0.57 $ 0.57 $ 0.53 $ 0.55 $ 0.34 $ 0.53 $ 0.46 $ 0.36 $ 2.22 $ 1.69 $ 1.5