Earnings and Cash Dividends per Common Share (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	May 15, 2013	Feb. 15, 2013	Dec. 31, 2012	May 15, 2012	Feb. 15, 2012
Earnings per share, basic and diluted [Abstract]
Net income	$ 2,321,000	$ 1,738,000	$ 3,947,000	$ 4,032,000
Weighted average shares outstanding basic (in shares)	13,531,007	13,404,628	13,543,690	13,377,209
Total dilutive shares outstanding	13,576,967	13,454,707	13,584,749	13,433,277
Earnings per share, basic and diluted (in dollars per share)	$ 0.17	$ 0.13	$ 0.29	$ 0.30
Dividends per share (in dollars per share)	$ 0.145	$ 0.14	$ 0.29	$ 0.28
Antidilutive securities excluded from computation of earnings per share (in shares)	77,150	83,900	82,150	78,900
Shares outstanding on record date (in shares)	13,516,441		13,516,441		13,559,043	13,586,903	13,519,131	13,479,677	13,409,941
Dividends reinvested			$ 154,000	$ 147,000
Stock repurchased and retired during the period (in shares)	71,638	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)	5,896	12,493	5,320	14,664
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
Retention Awards [Member]
Earnings per share, basic and diluted [Abstract]
Incremental common shares attributable to share-based payment arrangements (in shares)	16,775	16,414	13,980	20,029
Stock Subscribed LTEIP [Member]
Earnings per share, basic and diluted [Abstract]
Incremental common shares attributable to share-based payment arrangements (in shares)	23,289	21,172	21,759	21,375