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17. Quarterly Data (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]                      
Total interest income $ 10,106 $ 9,982 $ 9,815 $ 9,905 $ 9,960 $ 9,947 $ 9,191 $ 9,567 $ 39,809 $ 38,666 $ 38,420
Total interest expense 820 828 813 809 850 874 875 884 3,271 3,484 4,287
Net interest income 9,286 9,154 9,002 9,096 9,110 9,073 8,316 8,683 36,538 35,182 34,133
(Reduction of) provision for loan losses (99) (360) (531) (216) (211) 235 (214) 173 (1,206) (17) (699)
Other income 3,666 3,414 3,572 3,324 3,504 3,266 3,297 3,245 13,976 13,312 12,164
Other expense 11,783 9,598 9,109 9,492 10,024 8,669 8,337 8,748 39,982 35,778 35,671
Income before income taxes 1,266 3,330 3,996 3,144 2,801 3,435 3,490 3,007 11,738 12,733 11,325
Income tax (benefit) (36) 872 1,032 691 613 942 866 679 2,561 3,100 1,937
Net earnings $ 1,302 $ 2,458 $ 2,964 $ 2,453 $ 2,188 $ 2,493 $ 2,624 $ 2,328 $ 9,177 $ 9,633 $ 9,388
Basic net earnings per share $ 0.24 $ 0.45 $ 0.54 $ 0.45 $ 0.40 $ 0.45 $ 0.47 $ 0.41 $ 1.68 $ 1.73 $ 1.67
Diluted net earnings per share $ 0.24 $ 0.44 $ 0.53 $ 0.44 $ 0.39 $ 0.45 $ 0.47 $ 0.41 $ 1.65 $ 1.72 $ 1.66