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Quarterly Financial Data (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Quarterly Financial Data [Abstract]                      
Total revenue $ 23,548 $ 19,290 $ 24,508 $ 26,376 $ 18,645 $ 17,701 $ 13,758 $ 15,054 $ 93,722 $ 65,158 $ 53,908
Operating income 5,523 4,241 4,829 5,622 4,666 3,643 3,222 3,329 20,215 14,860 11,364
Net income applicable to common shares $ 3,571 $ 2,606 $ 3,000 $ 3,508 $ 3,024 $ 2,231 $ 2,008 $ 2,497 $ 12,685 $ 9,760 $ 7,028
Net income per share - Basic $ 0.29 $ 0.21 $ 0.25 $ 0.29 $ 0.25 $ 0.18 $ 0.16 $ 0.21 $ 1.04 $ 0.80 $ 0.58
Net income per share - Diluted $ 0.29 $ 0.21 $ 0.24 $ 0.29 $ 0.25 $ 0.18 $ 0.16 $ 0.20 $ 1.03 $ 0.80 $ 0.58