Earnings and Cash Dividends per Common Share (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Feb. 15, 2013	Dec. 31, 2012	Feb. 15, 2012
Earnings per share, basic and diluted [Abstract]
Net income	$ 1,626,000	$ 2,294,000
Weighted average shares outstanding basic (in shares)	13,556,515	13,349,791
Total dilutive shares outstanding	13,578,429	13,405,357
Earnings per share, basic and diluted (in dollars per share)	$ 0.12	$ 0.17
Dividends per share (in dollars per share)	$ 0.145	$ 0.14
Antidilutive securities excluded from computation of earnings per share (in shares)	82,150	87,950
Shares outstanding on record date (in shares)	13,552,582		13,586,903	13,519,131	13,409,941
Dividends reinvested	$ 78,000	$ 71,000
Stock repurchased and retired during the period (in shares)	52,647
Stock Options (dilutive only) [Member]
Earnings per share, basic and diluted [Abstract]
Incremental common shares attributable to share-based payment arrangements (in shares)	4,788	16,737
Stock subscribed (ESPP) [Member]
Earnings per share, basic and diluted [Abstract]
Incremental common shares attributable to share-based payment arrangements (in shares)	0	1,162
Stock Subscribed LTEIP [Member]
Earnings per share, basic and diluted [Abstract]
Incremental common shares attributable to share-based payment arrangements (in shares)	8,777	22,079
Retention Awards [Member]
Earnings per share, basic and diluted [Abstract]
Incremental common shares attributable to share-based payment arrangements (in shares)	8,349	15,588