Summary of Significant Accounting Policies (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Numerator:
Net income available to common stockholders	$ 2,949	$ 2,705
Denominator:
Denominator for basic earnings per share - weighted average shares	5,673	5,658
Effect of dilutive securities:
Common stock equivalents	65	20
Denominator for diluted earnings per share - adjusted weighted-average shares and assumed conversions	5,738	5,678
Basic earnings per share	$ 0.52	$ 0.48
Diluted earnings per share	$ 0.51	$ 0.48