Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Retained Earnings	Total
Beginning balance at Dec. 31, 2016	$ 111	$ 35,453	$ 152,810	$ 188,374
Beginning balance, shares at Dec. 31, 2016	11,093,489
Restricted stock grants, net of forfeitures	$ 1	(1)
Restricted stock grants, net of forfeitures, shares	66,395
Stock-based compensation		2,427		2,427
Common stock dividends			(2,853)	(2,853)
Net income			10,578	10,578
Ending balance at Mar. 31, 2017	$ 112	37,879	160,535	198,526
Ending balance, shares at Mar. 31, 2017	11,159,884
Impact of adoption of new accounting standards | Accounting Standards Update 2014-09			(171)	(171)
Beginning balance at Dec. 31, 2017	$ 112	47,079	162,006	209,197
Beginning balance, shares at Dec. 31, 2017	11,167,425
Restricted stock grants, net of forfeitures	$ 1	(1)
Restricted stock grants, net of forfeitures, shares	133,246
Stock-based compensation		2,688		2,688
Common stock dividends			(2,889)	(2,889)
Net income			9,467	9,467
Ending balance at Mar. 31, 2018	$ 113	$ 49,766	$ 168,413	$ 218,292
Ending balance, shares at Mar. 31, 2018	11,300,671