Consolidated Statements of Changes in Shareholders' Equity (unaudited) - USD ($) $ in Thousands	Total	Additional Paid-In Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Restricted Stock	Restricted Stock Treasury Stock
Beginning balance at Dec. 31, 2017	$ 243,910	$ 97,042	$ 148,298	$ (1,087)	$ (343)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	7,097		7,097
Other comprehensive income	(3,902)				(3,902)
Restricted stock award grants	0	(933)		933
Stock-based compensation expense	677	677
Purchase of treasury stock	(286)			(286)		$ (162)	$ (162)
Cash dividends declared	(2,523)		(2,523)
Ending balance at Mar. 31, 2018	244,811	96,786	152,872	(602)	(4,245)
Beginning balance at Dec. 31, 2018	262,830	97,602	171,780	(2,556)	(3,996)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	9,473		9,473
Other comprehensive income	4,856				4,856
Restricted stock award grants	0	(1,055)		1,055
Stock-based compensation expense	592	592
Purchase of treasury stock						$ (201)	$ (201)
Cash dividends declared	(2,591)		(2,591)
Ending balance at Mar. 31, 2019	$ 274,959	$ 97,139	$ 178,662	$ (1,702)	$ 860