Earnings and Cash Dividends per Common Share (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Aug. 15, 2013	May 15, 2013	Feb. 15, 2013	Dec. 31, 2012	Aug. 15, 2012	May 15, 2012	Feb. 15, 2012
Earnings per share, basic and diluted [Abstract]
Net income	$ 1,862,000	$ 1,741,000	$ 5,809,000	$ 5,773,000
Weighted average shares outstanding	13,543,062	13,427,883	13,543,479	13,394,224
Total dilutive shares outstanding	13,592,577	13,485,143	13,594,198	13,452,642
Earnings per share, basic and diluted (in dollars per share)	$ 0.14	$ 0.13	$ 0.43	$ 0.43
Dividends per share (in dollars per share)	$ 0.145	$ 0.14	$ 0.435	$ 0.42
Antidilutive securities excluded from computation of earnings per share (in shares)	72,950	78,900	82,150	78,900
Shares outstanding on record date (in shares)	13,553,160		13,553,160		13,544,964	13,559,043	13,586,903	13,519,131	13,494,599	13,479,677	13,409,941
Dividends reinvested			$ 229,000	$ 223,000
Stock repurchased and retired during the period (in shares)	0	0	124,285	0
Stock Options (dilutive only) [Member]
Earnings per share, basic and diluted [Abstract]
Incremental common shares attributable to share-based payment arrangements (in shares)	6,770	15,316	5,725	14,628
Stock subscribed (ESPP) [Member]
Earnings per share, basic and diluted [Abstract]
Incremental common shares attributable to share-based payment arrangements (in shares)	0	550	0	282
Retention Awards [Member]
Earnings per share, basic and diluted [Abstract]
Incremental common shares attributable to share-based payment arrangements (in shares)	20,115	20,006	21,366	22,417
Stock Subscribed LTEIP [Member]
Earnings per share, basic and diluted [Abstract]
Incremental common shares attributable to share-based payment arrangements (in shares)	22,630	21,388	23,628	21,091