Earnings per Share - Components (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Basic earnings per share:
Net income available to shareholders	$ 3,860	$ 3,098	$ 12,046	$ 8,095
Average shares outstanding	6,276,236	6,264,200	6,276,236	6,265,290
Basic earnings per share (in dollars per share)	$ 0.62	$ 0.49	$ 1.92	$ 1.29
Diluted earnings per share:
Net income available to shareholders	$ 3,860	$ 3,098	$ 12,046	$ 8,095
Average shares outstanding	6,276,236	6,264,200	6,276,236	6,265,290
Effect of dilutive stock options	0	6,617	0	6,740
Average shares outstanding including dilutive stock options	6,276,236	6,270,817	6,276,236	6,272,030
Diluted earnings per share (in dollars per share)	$ 0.62	$ 0.49	$ 1.92	$ 1.29