Statement of Stockholders' Equity (USD $) In Thousands	Total	Common Stock	Additional Paid in Capital	Retained Earnings	Unallocated ESOP Shares	Accumulated Other Comprensive Income (Loss)	Treasury Stock
Stockholder's Equity Beginning Balance at Dec. 31, 2009	$ 140,818	$ 15,170	$ 178,192	$ 24,100	$ (2,204)	$ (6,640)	$ (67,800)
Net Income	21,892	0	0	21,892	0	0	0
Other Comprehensive (Loss) Income	217	0	0	0	0	217	0
Stock Dividend	0	456	9,962	(10,418)	0	0	0
Cash Dividends Paid	(10,997)	0	0	(10,997)	0	0	0
Stock Options Exercised	798	0	352	0	0	0	446
Shares Issued Under the Directors' Stock Plan	149	0	101	0	0	0	48
Shares Issued Under the Employee Stock Purchase Plan	475	0	310	0	0	0	165
Shares Issued for Dividend Reinvestment Plans	1,715	0	1,163	0	0	0	552
Stock-Based Compensation Expense	299	0	299	0	0	0	0
Tax Benefit for Disposition of Stock Options	105	0	105	0	0	0	0
Purchases of Treasury Stock	(3,347)	0	0	0	0	0	(3,347)
Shares Issued for Acquisition of Subsidiary	682	0	459	0	0	0	223
Acquisition by ESOP of Arrow Stock	(1,000)	0	0	0	(1,000)	0	0
Allocation of ESOP Stock	453	0	125	0	328	0	0
Stockholder's Equity Ending Balance at Dec. 31, 2010	152,259	15,626	191,068	24,577	(2,876)	(6,423)	(69,713)
Net Income	21,933	0	0	21,933	0	0	0
Other Comprehensive (Loss) Income	(272)	0	0	0	0	(272)	0
Stock Dividend	0	468	10,647	(11,115)	0	0	0
Cash Dividends Paid	(11,448)	0	0	(11,448)	0	0	0
Stock Options Exercised	1,413	0	705	0	0	0	708
Shares Issued Under the Directors' Stock Plan	175	0	104	0	0	0	71
Shares Issued Under the Employee Stock Purchase Plan	474	0	282	0	0	0	192
Shares Issued for Dividend Reinvestment Plans	1,796	0	1,062	0	0	0	734
Stock-Based Compensation Expense	354	0	354	0	0	0	0
Tax Benefit for Disposition of Stock Options	51	0	51	0	0	0	0
Purchases of Treasury Stock	(6,039)	0	0	0	0	0	(6,039)
Shares Issued for Acquisition of Subsidiary	5,261	0	3,275	0	0	0	1,986
Acquisition by ESOP of Arrow Stock	0
Allocation of ESOP Stock	428	0	52	0	376	0	0
Stockholder's Equity Ending Balance at Dec. 31, 2011	166,385	16,094	207,600	23,947	(2,500)	(6,695)	(72,061)
Net Income	22,179	0	0	22,179	0	0	0
Other Comprehensive (Loss) Income	(1,767)	0	0	0	0	(1,767)	0
Stock Dividend	0	322	7,738	(8,060)	0	0	0
Cash Dividends Paid	(11,815)	0	0	(11,815)	0	0	0
Stock Options Exercised	2,105	0	1,152	0	0	0	953
Shares Issued Under the Directors' Stock Plan	175	0	104	0	0	0	71
Shares Issued Under the Employee Stock Purchase Plan	484	0	279	0	0	0	205
Shares Issued for Dividend Reinvestment Plans	1,822	0	1,086	0	0	0	736
Stock-Based Compensation Expense	424	0	424	0	0	0	0
Tax Benefit for Disposition of Stock Options	68	0	68	0	0	0	0
Purchases of Treasury Stock	(4,877)	0	0	0	0	0	(4,877)
Shares Issued for Acquisition of Subsidiary	233	0	140	0	0	0	93
Acquisition by ESOP of Arrow Stock	0
Allocation of ESOP Stock	409	0	59	0	350	0	0
Stockholder's Equity Ending Balance at Dec. 31, 2012	$ 175,825	$ 16,416	$ 218,650	$ 26,251	$ (2,150)	$ (8,462)	$ (74,880)