Stockholders Equity Parenthetical (Parentheticals) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash Dividends Paid, per Share	$ 0.98	$ 0.95	$ 0.92
Stock Dividends - Shares	468,765	455,113	441,856
Stock Options Exercised	72,802	52,662	73,797
Shares Issued Under Directors Stock Plan	7,456	5,587	4,603
Shares Issued Under the Employee Stock Purchase Plan	20,484	19,564	19,055
Shares Issued for Dividend Reinvestment Plans	76,447	66,177	66,924
Purchase of Treasury Stock	251,962	135,812	151,078
Acquisition of Subsidiary	221,517	26,240	19,938
Acquisition by ESOP of Arrow Stock	0	40,890	0
Allocation of ESOP Stock	18,216	17,616	20,103