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Stock Based Compensation (Tables)

12 Months Ended

Dec. 31, 2015

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

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award

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, 2016	421,751
Granted	56,650
Exercised	(111,992		)
Forfeited	(10,758		)
Outstanding at December 31, 2016	355,651
Exercisable at Period-End	224,039
Vested and Expected to Vest	131,612
Roll Forward of Shares Outstanding - Weighted Average Exercise Price:
Outstanding at January 1, 2016	$	21.93
Granted	25.10
Exercised	21.47
Forfeited	23.97
Outstanding at December 31, 2016	22.52
Exercisable at Period-End	21.40
Vested and Expected to Vest	24.44
Weighted Average Remaining Contractual Life (in years):
Outstanding at December 31, 2016	5.59
Exercisable at December 31, 2016	4.05
Vested and Expected to Vest	8.21
Aggregate Intrinsic Value:
Outstanding at December 31, 2016	$	6,395
Exercisable at December 31, 2016	4,279
Vested and Expected to Vest	2,116
Shares Available for Grant at Period-End	367,775

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range

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

	Exercise Price Ranges
	$17.82 to $18.54			$20.78			$22.18 to $22.80			23.33			$24.61 to $25.10			Total
Outstanding at December 31, 2016
Number of Shares Outstanding	51,254			40,305			100,747			59,912			103,433			355,651
Weighted-Average Remaining Contractual Life (in years)	1.71			3.08			4.58			7.05			8.61			5.59
Weighted-Average Exercise Price	$	18.32		$	20.78		$	22.46		$	23.33		$	24.87		$	22.52
Exercisable at December 31, 2016
Number of Shares Outstanding	51,254			40,305			98,555			25,134			8,791			224,039
Weighted-Average Remaining Contractual Life (in years)	1.71			3.08			4.56			7.01			8.08			4.05
Weighted-Average Exercise Price	$	18.32		$	20.78		$	22.46		$	23.33		$	24.61		$	21.40

Other Stock Based Compensation Disclosure Table

Schedule of Other Stock Option Plan Information

		2016				2015				2014
Shares Granted		56,650				57,258				77,784
Weighted Average Grant Date Information:
Fair Value of Options Granted		$	5.60			$	5.50			$	5.63
Fair Value Assumptions:
Dividend Yield		3.88		%		3.90		%		3.97		%
Expected Volatility		32.95		%		33.55		%		35.30		%
Risk Free Interest Rate		1.80		%		1.57		%		2.19		%
Expected Lives (in years)		7.56				7.66				6.85
Amount Expensed During the Year		$	287			$	308			$	360
Compensation Costs for Non-vested Awards Not Yet Recognized		521				500				478
Weighted Average Expected Vesting Period, In Years		2.71				2.12				1.68
Proceeds From Stock Options Exercised		$	2,404			$	917			$	1,454
Tax Benefits Related to Stock Options Exercised		188				59				25
Intrinsic Value of Stock Options Exercised		1,010				250				170

Schedule of Employee Stock Ownership Plan (ESOP) Disclosures

Schedule of ESOP Compensation Expense

		2016				2015				2014
ESOP Compensation Expense		$	1,200			$	900			$	800

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, 2016 were as follows:

Schedule of Shares in ESOP Plan

ESOP Plan Shares:	2016
Allocated Shares	713,814
Shares Released for Allocation During 2016	36,927
Unallocated Shares	19,466
Total ESOP Shares	770,207
Market Value of Unallocated Shares	$	789

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Other Stock Based Compensation Disclosure Table [Table Text Block]

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

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Tabular disclosure of the details pertaining to each employee stock ownership plan.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=65895303&loc=d3e17540-113929

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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