Earnings Per Common Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Numerator for basic and diluted earnings per common share-net income applicable to common shares (in dollars)	$ 5,088	$ 5,479	$ 6,109	$ 5,559	$ 5,156	$ 5,423	$ 3,823	$ 3,645	$ 22,235	$ 18,047	$ 13,506
Denominator:
Denominator for basic earnings per common share - weighted average common shares, including participating securities (in shares)	9,766	9,780	9,774	9,736	9,729	9,729	9,729	9,726	9,764	9,728	9,371
Effect of dilutive securities:
Employee stock options									87	51	15
Warrants									320	219	154
Dilutive potential common shares	10,198	10,212	10,156	10,105	10,012	10,000	9,985	9,970	407	270	169
Denominator for diluted earnings per common share (in shares)									10,171	9,998	9,540
Basic earnings per common share (in dollars per share)	$ 0.52	$ 0.56	$ 0.63	$ 0.57	$ 0.53	$ 0.56	$ 0.39	$ 0.37	$ 2.28	$ 1.86	$ 1.44
Diluted earnings per common share (in dollars per share)	$ 0.50	$ 0.54	$ 0.60	$ 0.55	$ 0.52	$ 0.54	$ 0.38	$ 0.37	$ 2.19	$ 1.81	$ 1.42