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Stock Based Compensation | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock Based Compensation | STOCK BASED COMPENSATION (Dollars In Thousands, Except Share and Per Share Amounts) Arrow has established two stock based compensation plans: an Incentive and Non-qualified Stock Option Plan (Long Term Incentive Plan) and an Employee Stock Ownership Plan (ESOP). All share and per share data have been adjusted for the September 28, 2017 3% stock dividend. Long Term Incentive Plan Options may be granted at a price no less than the greater of the par value or fair market value of such shares on the date on which such option is granted, and generally expire ten years from the date of grant. The options usually vest over a four-year period. 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 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 |
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 |
Employee Stock Ownership Plan Arrow maintains an employee stock ownership plan (“ESOP”). Substantially all employees of Arrow and its subsidiaries are eligible to participate upon satisfaction of applicable service requirements. The ESOP borrowed funds from one of Arrow’s subsidiary banks to purchase outstanding shares of Arrow’s common stock. The notes require annual payments of principal and interest through 2018. 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. In addition, the Company makes additional cash contributions to the Plan each year. 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 The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68057994&loc=d3e25284-112666 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 4: 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 5: 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 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 + Details
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