Earnings Per Share - Computation of earning per share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Basic earnings per share
Income available to common stockholders (in dollars)	$ 975	$ 916
Income available to common stockholders (in shares)	1,533,333	1,524,872
Income available to common stockholders (in dollars per share)	$ 0.64	$ 0.60
Effect of dilutive RRP awards and stock options (in shares)	4,636	3,940
Diluted earnings per share
Income available to common stockholders and assumed conversions (in dollars)	$ 975	$ 916
Income available to common stockholders and assumed conversions (in shares)	1,537,969	1,528,812
Income available to common stockholders and assumed conversions (in dollars per share)	$ 0.63	$ 0.60