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Basis of Presentation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Weighted average basic shares outstanding (shares)	6,944	6,110	6,929	6,101
Potentially dilutive common shares related to:
Stock options (shares)	74	52	74	57
Unvested restricted stock awards (shares)	15	12	16	15
Weighted average diluted shares outstanding (shares)	7,033	6,174	7,019	6,173
Net income	$ 7,891	$ 5,186	$ 14,280	$ 9,734	$ 15,976
Basic EPS (usd per share)	$ 1.14	$ 0.85	$ 2.06	$ 1.60
Diluted EPS (usd per share)	$ 1.12	$ 0.84	$ 2.03	$ 1.58
Weighted average anti-dilutive shares not included in the calculation of diluted EPS (shares)	30	33	35	23

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