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Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award | Roll Forward Schedule of Long Term Incentive Plan by Shares and Weighted Average Exercise Prices
| Long Term Incentive Plan
Roll Forward of Shares Outstanding: |
Outstanding at January 1, 2017 | 366,329 |
Granted | 55,621 |
Exercised | (58,804 | )
Forfeited | (16,991 | )
Outstanding at December 31, 2017 | 346,155 |
Exercisable at Period-End | 225,694 |
Vested and Expected to Vest | 120,461 |
Roll Forward of Shares Outstanding - Weighted Average Exercise Price: |
Outstanding at January 1, 2017 | $ | 21.86 |
Granted | 36.12 |
Exercised | 20.25 |
Forfeited | 28.27 |
Outstanding at December 31, 2017 | 24.12 |
Exercisable at Period-End | 21.61 |
Vested and Expected to Vest | 28.80 |
Weighted Average Remaining Contractual Life (in years): |
Outstanding at December 31, 2017 | 5.11 |
Exercisable at December 31, 2017 | 3.54 |
Vested and Expected to Vest | 8.05 |
Aggregate Intrinsic Value: |
Outstanding at December 31, 2017 | $ | 3,403 |
Exercisable at December 31, 2017 | 2,785 |
Vested and Expected to Vest | 618 |
Shares Available for Grant at Period-End | 340,178 |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range | Schedule of Shares Authorized Under the Long Term Incentive Plan by Exercise Price Range
| Exercise Price Ranges
| $18.00 | $20.17 to $21.56 | $22.14 to $22.65 | $23.89 to $24.37 | $36.12 | Total
Outstanding at December 31, 2017 |  |  |  |  |  |
Number of Shares Outstanding | 27,999 |  | 85,068 |  | 94,111 |  | 89,536 |  | 49,441 |  | 346,155 |
Weighted-Average Remaining Contractual Life (in years) | 1.06 |  | 2.58 |  | 4.49 |  | 7.27 |  | 9.07 |  | 5.11 |
Weighted-Average Exercise Price | $ | 18.00 |  | $ | 20.98 |  | $ | 22.43 |  | $ | 24.15 |  | $ | 36.12 |  | $ | 24.12 |
Exercisable at December 31, 2017 |  |  |  |  |  |
Number of Shares Outstanding | 27,999 |  | 85,068 |  | 79,797 |  | 31,800 |  | 1,030 |  | 225,694 |
Weighted-Average Remaining Contractual Life (in years) | 1.06 |  | 2.58 |  | 4.20 |  | 6.49 |  | 9.07 |  | 3.54 |
Weighted-Average Exercise Price | $ | 18.00 |  | $ | 20.98 |  | $ | 22.39 |  | $ | 24.08 |  | $ | 36.12 |  | $ | 21.61 |
Other Stock Based Compensation Disclosure Table | Schedule of Other Long Term Incentive Plan Information
|  | 2017 |  | 2016 |  | 2015
Shares Granted |  | 55,621 |  |  | 58,350 |  |  | 58,975 |
Weighted Average Grant Date Information: |  |  |  |  |  |
Fair Value of Options Granted |  | $ | 6.25 |  |  | $ | 5.44 |  |  | $ | 5.34 |
Fair Value Assumptions: |  |  |  |  |  |
Dividend Yield |  | 2.72 | % |  | 3.88 | % |  | 3.90 | %
Expected Volatility |  | 21.40 | % |  | 32.95 | % |  | 33.55 | %
Risk Free Interest Rate |  | 2.25 | % |  | 1.80 | % |  | 1.57 | %
Expected Lives (in years) |  | 6.88 |  |  | 7.56 |  |  | 7.66 |
Amount Expensed During the Year |  | $ | 351 |  |  | $ | 287 |  |  | $ | 308 |
Compensation Costs for Non-vested Awards Not Yet Recognized |  | 528 |  |  | 521 |  |  | 500 |
Weighted Average Expected Vesting Period, In Years |  | 2.59 |  |  | 2.71 |  |  | 2.12 |
Proceeds From Stock Options Exercised |  | $ | 1,190 |  |  | $ | 2,404 |  |  | $ | 918 |
Tax Benefits Related to Stock Options Exercised |  | 168 |  |  | 188 |  |  | 59 |
Intrinsic Value of Stock Options Exercised |  | 825 |  |  | 1,010 |  |  | 250 |
Schedule of Employee Stock Ownership Plan (ESOP) Disclosures | Schedule of ESOP Compensation Expense
|  | 2017 |  | 2016 |  | 2015
ESOP Compensation Expense |  | $ | 1,400 |  |  | $ | 1,200 |  |  | $ | 900 |
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, 2017 were as follows: Schedule of Shares in ESOP Plan
ESOP Plan Shares: | 2017
Allocated Shares | 759,081 |
Shares Released for Allocation During 2017 | 10,407 |
Unallocated Shares | 9,643 |
Total ESOP Shares | 779,131 |
Market Value of Unallocated Shares | $ | 327 |

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- 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 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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- Definition Tabular disclosure of the details pertaining to each employee stock ownership plan. + References 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 + Details
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- 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 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 + Details
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