Summary of Significant Accounting Policies (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Numerator:
Net income available to common stockholders	$ 4,804	$ 5,132	$ 7,753	$ 7,837
Denominator:
Denominator for basic earnings per share - weighted average shares	5,683	5,661	5,677	5,658
Effect of dilutive securities:
Common stock equivalents	62	2	63	9
Denominator for diluted earnings per share - adjusted weighted-average shares and assumed conversions	5,745	5,663	5,740	5,667
Basic earnings per share	$ 0.85	$ 0.91	$ 1.37	$ 1.39
Diluted earnings per share	$ 0.84	$ 0.91	$ 1.35	$ 1.38