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Stock Based Compensation (Tables)

12 Months Ended

Dec. 31, 2012

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]

Roll Forward Schedule of Stock Option Plan by Shares and Weighted Average Exercise Prices



	Stock Option Plans
Roll Forward of Shares Outstanding:
Outstanding at January 1, 2012	482,765
Granted	75,786
Exercised	(97,804		)
Forfeited	(18,362		)
Outstanding at December 31, 2012	442,385
Exercisable at December 31, 2012	259,150
Vested and Expected to Vest	183,235

Roll Forward of Shares Outstanding - Weighted Average Exercise Price:
Outstanding at January 1, 2012	$	22.46
Granted	24.92
Exercised	21.53
Forfeited	23.93
Outstanding at December 31, 2012	23.03
Exercisable at December 31, 2012	22.46
Vested and Expected to Vest	23.83

Weighted Average Remaining Contractual Life ( in years):
Outstanding at December 31, 2012	5.95
Exercisable at December 31, 2012	4.45
Vested and Expected to Vest	8.08

Aggregate Intrinsic Value:
Outstanding at December 31, 2012	$	849
Exercisable at December 31, 2012	645
Vested and Expected to Vest	204

Shares Available for Grant at Period-End	37,695

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

Schedule of Shares Authorized Under the Stock Option Plan by Exercise Price Range



	Exercise Price Ranges
	$19.47 to $20.27		$21.63 to $21.66		$22.19 to $22.71		$24.24 to $24.92		$26.29		Total
Outstanding Options at December 31, 2012
Number of Shares Outstanding	103,872		32,719		102,916		148,676		54,202		442,385
Weighted-Average Remaining Contractual Life (in years)	5.66		3.92		5.25		8.55		1.96		5.95
Weighted-Average Exercise Price	$	19.99	$	21.66	$	22.56	$	24.59	$	26.29	$	23.03

Exercisable Options at December 31, 2012
Number of Shares Outstanding	86,021		32,719		66,826		19,382		54,202		259,150
Weighted-Average Remaining Contractual Life (in years)	5.58		3.92		4.26		8.01		1.96		4.45
Weighted-Average Exercise Price	$	19.93	$	21.66	$	22.47	$	24.26	$	26.29	$	22.46

Other Stock Based Compensation Disclosure Table [Table Text Block]

Schedule of Other Stock Option Plan Information



	2012			2011			2010
Shares Granted	75,786			78,425			77,047
Weighted Average Grant Date Information:
Fair Value of Options Granted	$	6.01		$	6.12		$	6.12
Fair Value Assumptions:
Dividend Yield	3.93		%	4.00		%	3.80		%
Expected Volatility	37.43		%	36.50		%	35.40		%
Risk Free Interest Rate	1.22		%	2.54		%	3.14		%
Expected Lives (in years)	6.46			6.40			7.79

Amount Expensed During the Year	$	424		$	354		$	299
Compensation Costs for Non-vested Awards Not Yet Recognized	737			705			579
Weighted Average Expected Vesting Period, In Years	1.71			1.80			1.80
Proceeds From Stock Options Exercised	$	2,105		$	1,413		$	798
Tax Benefits Related to Stock Options Exercised	68			51			105
Intrinsic Value of Stock Options Exercised	2,434			1,740			1,404

Schedule of Employee Stock Ownership Plan (ESOP) Disclosures [Table Text Block]

Schedule of ESOP Compensation Expense



	2012		2011		2010
ESOP Compensation Expense	$	550	$	550	$	500

As the debt is repaid, shares are released from collateral based on the proportion of debt paid to total debt outstanding for the year and allocated to active employees.

Shares pledged as collateral are reported as unallocated ESOP shares in stockholders’ equity. As shares are released from collateral, Arrow reports compensation expense equal to the current average market price of the shares, and the shares become outstanding for earnings per share computations. The ESOP shares as of December 31, 2012 were as follows:

Schedule of Shares in ESOP Plan



ESOP Plan Shares:	2012
Allocated Shares	740,124
Shares Released for Allocation During 2012	16,629
Unallocated Shares	102,890
Total ESOP Shares	859,643

Market Value of Unallocated Shares	$	2,570

- Definition

Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate.

+ References+ Details

- Definition

Tabular disclosure of the description of the plan, the basis for determining contributions, including the employee groups covered, and the nature and effect of significant matters affecting comparability of information for all periods presented. For leveraged ESOPs and pension reversion ESOPs, the disclosure may include the basis for releasing shares and how dividends on allocated and unallocated shares are used. Disclosure may also include a description of the accounting policies followed for ESOP transactions, including the method of measuring compensation, the classification of dividends on ESOP shares, and the treatment of ESOP shares for EPS computations. If the employer has both old ESOP shares for which it does not adopt the latest guidance and new ESOP shares for which the new guidance is required, the accounting policies for both blocks of shares may be described. Disclosure may also include he amount of compensation cost recognized during the period, the number of allocated shares, committed-to-be-released shares, and suspense shares held by the ESOP at the balance-sheet date, the fair value of unearned ESOP shares at the balance-sheet date for shares accounted for under the latest guidance, the existence and nature of any repurchase obligation, including disclosure of the fair value of the shares allocated as of the balance sheet date, which are subject to a repurchase obligation.

+ References+ Details

- Definition

Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

+ References+ Details