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Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award | Long Term Incentive Plan The Long Term Incentive Plan provides for the grant of incentive stock options, non-qualified stock options, restricted stock, restricted stock units, performance units and performance shares. The Compensation Committee of the Board of Directors administers the Long Term Incentive Plan.
Shares Available for Grant at Period-End |  |  |  | 261,614 |
The following table summarizes information about restricted stock unit activity for the year ended December 31, 2018 which was the first year the company has granted restricted stock units.
| Restricted Stock Units | Weighted Average Grant Date Fair Value
Non-vested at January 1, 2018 | — |  | $ | — |
Granted | 3,377 |  | $ | 32.57 |
Vested | — |  | $ | — |
Canceled | — |  | $ | — |
Non-vested at December 31, 2018 | 3,377 |  | $ | 32.57 |
The following table presents information on the amounts expensed related to Restricted Stock Units awarded pursuant to the Long Term Incentive Plan for the year ended December 31, 2018.
|  | 2018 |  |
Amount Expensed During the Year |  | 34 |  |
Compensation Costs for Non-vested Awards Not Yet Recognized |  | 76 |  |
The following table summarizes information about stock option activity for the year ended December 31, 2018.
| Shares | Weighted Average Exercise Price | Weighted Average Remaining Contractual Life (in years) | Aggregate Intrinsic Value
Outstanding at January 1, 2018 | 356,540 |  | 23.42 |  |  |
Granted | 53,466 |  | 31.84 |  |  |
Exercised | (107,818 | ) | 20.92 |  |  |
Forfeited | (17,666 | ) | 27.06 |  |  |
Outstanding at December 31, 2018 | 284,522 |  | 25.67 |  | 5.44 | 1,807 |
Vested at Period-End | 172,410 |  | 22.56 |  | 3.68 | 1,631 |
Expected to Vest | 112,112 |  | 30.46 |  | 8.16 | 176 |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range | Schedule of Stock Options Granted Under the Long Term Incentive Plan by Exercise Price Range
| Exercise Price Ranges |
| $17.48 | $19.58 to $20.93 | $21.50 to $21.99 | $23.19 to $23.66 | $31.84 | $35.07 | Total
Outstanding at December 31, 2018 |  |  |  |  |  |  |
Number of Stock Options Outstanding | 5,763 |  | 61,569 |  | 52,683 |  | 69,175 |  | 50,376 |  | 44,956 |  | 284,522 |
Weighted-Average Remaining Contractual Life (in years) | 0.06 |  | 1.65 |  | 3.75 |  | 6.34 |  | 9.09 |  | 7.86 |  | 5.44 |
Weighted-Average Exercise Price | 17.48 |  | 20.32 |  | 21.81 |  | 23.45 |  | 31.84 |  | 35.07 |  | 25.67 |
Vested at December 31, 2018 |  |  |  |  |  |  |
Number of Stock Options Outstanding | 5,763 |  | 61,569 |  | 52,683 |  | 38,243 |  | 1,030 |  | 13,122 |  | 172,410 |
Weighted-Average Remaining Contractual Life (in years) | 0.06 |  | 1.65 |  | 3.75 |  | 6.00 |  | 9.09 |  | 7.36 |  | 3.68 |
Weighted-Average Exercise Price | 17.48 |  | 20.32 |  | 21.81 |  | 23.40 |  | 31.84 |  | 35.07 |  | 22.55 |
Other Stock Based Compensation Disclosure Table | Schedule of Other Information on Stock Options Granted
|  | 2018 |  | 2017 |  | 2016
Stock Options Granted |  | 53,466 |  |  | 57,290 |  |  | 60,101 |
Weighted Average Grant Date Information: |  |  |  |  |  |
Fair Value of Options Granted |  | $ | 5.59 |  |  | $ | 6.07 |  |  | $ | 5.28 |
Fair Value Assumptions: |  |  |  |  |  |
Dividend Yield |  | 2.98 | % |  | 2.72 | % |  | 3.88 | %
Expected Volatility |  | 21.55 | % |  | 21.40 | % |  | 32.95 | %
Risk Free Interest Rate |  | 2.68 | % |  | 2.25 | % |  | 1.80 | %
Expected Lives (in years) |  | 6.98 |  |  | 6.88 |  |  | 7.56 |
Amount Expensed During the Year |  | $ | 322 |  |  | $ | 351 |  |  | $ | 287 |
Compensation Costs for Non-vested Awards Not Yet Recognized |  | 504 |  |  | 528 |  |  | 521 |
Weighted Average Expected Vesting Period, In Years |  | 2.74 |  |  | 2.59 |  |  | 2.71 |
Proceeds From Stock Options Exercised |  | 2,255 |  |  | $ | 1,190 |  |  | $ | 2,404 |
Tax Benefits Related to Stock Options Exercised |  | 240 |  |  | 168 |  |  | 188 |
Intrinsic Value of Stock Options Exercised |  | 1,552 |  |  | 825 |  |  | 1,010 |
Schedule of Employee Stock Ownership Plan (ESOP) Disclosures | Schedule of ESOP Compensation Expense
|  | 2018 |  | 2017 |  | 2016
ESOP Compensation Expense |  | $ | 1,400 |  |  | $ | 1,400 |  |  | $ | 1,200 |
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, 2018 were as follows: Schedule of Shares in ESOP Plan
ESOP Plan Shares: | 2018
Allocated Shares | 758,101 |
Shares Released for Allocation During 2018 | 4,931 |
Unallocated Shares | 5,001 |
Total ESOP Shares | 768,033 |
Market Value of Unallocated Shares | $ | 160 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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