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17. Quarterly Data (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
Quarterly Financial Information Disclosure [Abstract]                      
Total interest income $ 10,726 $ 10,698 $ 10,461 $ 10,064 $ 10,107 $ 9,982 $ 9,815 $ 9,905 $ 41,949 $ 39,809 $ 38,666
Total interest expense 507 650 622 598 821 828 813 809 2,377 3,271 3,484
Net interest income 10,219 10,048 9,839 9,466 9,286 9,154 9,002 9,096 39,572 36,538 35,182
(Reduction of) provision for loan losses (102) (218) 49 (236) (99) (360) (531) (216) (507) (1,206) (17)
Other income 3,177 3,504 3,281 2,876 3,666 3,414 3,572 3,324 12,838 13,976 13,312
Other expense 10,169 9,351 9,335 9,795 11,783 9,598 9,109 9,492 38,702 39,982 35,778
Income before income taxes 3,329 4,419 3,736 2,783 1,268 3,330 3,996 3,144 14,215 11,738 12,733
Income tax benefit 1,319 1,177 925 578 (34) 872 1,032 691 3,947 2,561 3,100
Net earnings $ 2,010 $ 3,242 $ 2,811 $ 2,205 $ 1,302 $ 2,458 $ 2,964 $ 2,453 $ 10,268 $ 9,177 $ 9,633
Basic net earnings 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 net earnings per share $ .34 $ .53 $ .46 $ .36 $ .22 $ .40 $ .48 $ .40 $ 1.69 $ 1.50 $ 1.56