Stockholder's Equity Parenthetical (Parentheticals) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash Dividends Paid, per Share	$ 0.99	$ 0.96	$ 0.93
Stock Dividends - Shares	321,886	468,765	455,113
Stock Options Exercised - Shares	96,471	72,802	52,662
Shares Issued Under Directors Stock Plan - Shares	7,226	7,456	5,587
Shares Issued Under the Employee Stock Purchase Plan - Shares	20,687	20,484	19,564
Shares Issued for Dividend Reinvestment Plans - Shares	74,260	76,447	66,177
Purchase of Treasury Stock - Shares	199,323	251,962	135,812
Acquisition of Subsidiary - Shares	9,356	221,517	26,240
Acquisition by ESOP of Arrow Stock - Shares	0	0	40,890
Allocation of ESOP Stock - Shares	16,629	18,216	17,616