Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Other comprehensive income net of tax:
Interest rate swap (cash flow hedge), tax	$ 99,198	$ 6,350
Unrealized holding losses on securities available for sale, tax benefit	361,091	579,725	246,422
Gain on sale or call of securities available for sale, tax	34,840	183,977
Change in beneficial obligation for defined benefit and SERP plans, tax	93,612	207,390	135,246
Reclassification adjustments for other than temporary impairment, tax	64,303	477,208	262,356
Other comprehensive income (loss), tax	$ 384,968	$ 72,754	$ 151,180
Cash dividends (in dollars per share)	$ 0.48	$ 0.72	$ 0.80
Issuance of common stock - nonvested shares (in shares)	10,914	28,847	10,585
Issuance of common stock - vested shares (in shares)	4,752	6,522