Earnings and Cash Dividends per Common Share (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	May 15, 2012	Feb. 15, 2012	Dec. 31, 2011	May 15, 2011	Feb. 15, 2011
Earnings per share, basic and diluted [Abstract]
Net income	$ 1,809,000	$ 2,694,000	$ 4,131,000	$ 4,836,000
Weighted average shares outstanding basic (in shares)	13,487,553	13,367,083	13,469,303	13,348,447
Total dilutive shares outstanding	13,500,046	13,380,186	13,483,967	13,360,949
Earnings per share, basic and diluted (in dollars per share)	$ 0.13	$ 0.20	$ 0.31	$ 0.36
Dividends per share (in dollars per share)	$ 0.14	$ 0.135	$ 0.28	$ 0.27
Antidilutive securities excluded from computation of earnings per share (in shares)	83,900	195,250	78,900	195,250
Shares outstanding on record date (in shares)	13,494,399		13,494,399		13,479,677	13,409,941	13,396,176	13,358,971	13,311,817
Dividends reinvested			$ 147,000	$ 135,000
Stock Options (dilutive only) [Member]
Earnings per share, basic and diluted [Abstract]
Incremental common shares attributable to share-based payment arrangements (in shares)	12,493	13,103	14,664	12,502
Stock subscribed (ESPP) [Member]
Earnings per share, basic and diluted [Abstract]
Incremental common shares attributable to share-based payment arrangements (in shares)	0	0	0	0