Earnings and Cash Dividends per Common Share (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Aug. 15, 2012	May 15, 2012	Feb. 15, 2012	Dec. 31, 2011	Aug. 15, 2011	May 15, 2011	Feb. 15, 2011
Earnings per share, basic and diluted [Abstract]
Net income	$ 1,741,000	$ 2,133,000	$ 5,773,000	$ 6,827,000
Weighted average shares outstanding basic (in shares)	13,511,009	13,394,225	13,483,358	13,363,874
Total dilutive shares outstanding	13,526,875	13,409,414	13,498,268	13,376,261
Earnings per share, basic and diluted (in dollars per share)	$ 0.13	$ 0.16	$ 0.43	$ 0.51
Dividends per share (in dollars per share)	$ 0.14	$ 0.135	$ 0.42	$ 0.405
Antidilutive securities excluded from computation of earnings per share (in shares)	78,900	179,250	78,900	195,250
Shares outstanding on record date (in shares)	13,527,537		13,527,537		13,494,599	13,479,677	13,409,941	13,396,176	13,383,012	13,358,971	13,311,817
Dividends reinvested			$ 223,000	$ 204,000
Stock Options (dilutive only) [Member]
Earnings per share, basic and diluted [Abstract]
Incremental common shares attributable to share-based payment arrangements (in shares)	15,316	13,310	14,628	11,272
Stock subscribed (ESPP) [Member]
Earnings per share, basic and diluted [Abstract]
Incremental common shares attributable to share-based payment arrangements (in shares)	550	1,879	282	1,115