Summary of Significant Accounting Policies (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Numerator:
Net income	$ 3,245	$ 4,296	$ 10,461	$ 12,049
Less: Net income allocated to unvested participating securities	28	0	91	0
Net income available to common stockholders	$ 3,217	$ 4,296	$ 10,370	$ 12,049
Denominator:
Denominator for basic earnings per share — weighted average shares	5,699	5,686	5,696	5,679
Effect of dilutive securities:
Common stock equivalents	43	68	55	65
Denominator for diluted earnings per share — adjusted weighted-average shares and assumed conversions	5,742	5,754	5,751	5,744
Basic earnings per share	$ 0.56	$ 0.76	$ 1.82	$ 2.12
Diluted earnings per share	$ 0.56	$ 0.75	$ 1.80	$ 2.10