Earnings per Share - Components (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Basic earnings per share:
Net income available to shareholders	$ 4,666	$ 2,090
Average shares outstanding	6,034,843	6,028,708
Basic earnings per share (in dollars per share)	$ 0.77	$ 0.35
Diluted earnings per share:
Net income available to shareholders	$ 4,666	$ 2,090
Average shares outstanding	6,034,843	6,028,708
Effect of dilutive stock options	0	5,949
Average shares outstanding including dilutive stock options	6,034,843	6,034,657
Diluted earnings per share (in dollars per share)	$ 0.77	$ 0.35