Accounting Policies Significant Accounting Policies (Policies)	9 Months Ended
Sep. 30, 2016
Accounting Policies [Abstract]
New Accounting Standards Updates [Policy Text Block]	New Accounting Standards Updates (ASU): During 2016, through the date of this report, the FASB issued 15 accounting standards updates. Some of the standards listed below did not have an immediate impact on Arrow, but could in the future. ASU 2016-01 "Recognition and Measurement of Financial Assets and Financial Liabilities" will significantly change the income statement impact of equity investments. For Arrow, the standard is effective for the first quarter of 2018, and will require that equity investments be measured at fair value, with changes in fair value measured in net income. As of September 30, 2016 , we hold a $1.1 million cost basis in a small portfolio of equity investments and we do not expect that the adoption of this change in accounting for equity investments will have a material impact on our financial position or the results of operations in periods subsequent to its adoption. ASU 2016-02 "Leases" will require the recognition of operating leases. For Arrow, the standard becomes effective in the first quarter of 2019. We do not expect that the adoption of this change in accounting for operating leases will have a material impact on our financial position or the results of operations in periods subsequent to its adoption. As of September 30, 2016, we have less than $3.0 million in operating leases. ASU 2016-09 "Compensation - Stock Compensation" simplifies certain aspects of accounting for share-based payment transactions, including the tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. For Arrow, the standard becomes effective in the first quarter of 2017. We do not expect that the adoption of this change in accounting for stock-based compensation will have a material impact on our financial position or the results of operations in periods subsequent to its adoption. ASU 2016-13 "Financial Instruments - Credit Losses" will change the way we and other financial entities recognize losses on assets measured at amortized costs and change the method for recognizing credit losses on securities available-for-sale. Currently, loan losses are recognized using an "incurred loss" methodology. Under ASU 2016-13, the methodology will change to a current expected loss over the life of the loan. Currently, credit losses on available-for-sale securities reduce the carrying value of the instrument and cannot be reversed. Under ASU 2016-13, the amount of the credit loss is carried as a valuation allowance and can be reversed. For Arrow, the standard is effective for the first quarter of 2020 and early adoption is allowed in 2019. The Company is currently evaluating the impact of the pending adoption of the ASU on its consolidated financial statements. The initial adjustment will not be reported in earnings, but as the cumulative effect of a change in accounting principle. ASU 2016-15 "Statement of Cash Flows" provides guidance on the classification of eight specific cash flow issues in order to increase consistency in reporting. Currently, GAAP is either unclear or does not include specific guidance on the cash flow issues addressed in this Update. Arrow currently reports the specifically identified cash flow transactions using the appropriate classification as outlined in the Update. For Arrow, the standard becomes effective in the first quarter of 2017. We do not expect that the adoption of this change in classification for financial reporting will have a material impact on our financial position or the results of operations in periods subsequent to its adoption.

New Accounting Standards Updates (ASU): During 2016, through the date of this report, the FASB issued 15 accounting standards updates. Some of the standards listed below did not have an immediate impact on Arrow, but could in the future.

ASU 2016-01 "Recognition and Measurement of Financial Assets and Financial Liabilities" will significantly change the income statement impact of equity investments. For Arrow, the standard is effective for the first quarter of 2018, and will require that equity investments be measured at fair value, with changes in fair value measured in net income. As of September 30, 2016 , we hold a $1.1 million cost basis in a small portfolio of equity investments and we do not expect that the adoption of this change in accounting for equity investments will have a material impact on our financial position or the results of operations in periods subsequent to its adoption.

ASU 2016-02 "Leases" will require the recognition of operating leases. For Arrow, the standard becomes effective in the first quarter of 2019. We do not expect that the adoption of this change in accounting for operating leases will have a material impact on our financial position or the results of operations in periods subsequent to its adoption. As of September 30, 2016, we have less than $3.0 million in operating leases.

ASU 2016-09 "Compensation - Stock Compensation" simplifies certain aspects of accounting for share-based payment transactions, including the tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. For Arrow, the standard becomes effective in the first quarter of 2017. We do not expect that the adoption of this change in accounting for stock-based compensation will have a material impact on our financial position or the results of operations in periods subsequent to its adoption.

ASU 2016-13 "Financial Instruments - Credit Losses" will change the way we and other financial entities recognize losses on assets measured at amortized costs and change the method for recognizing credit losses on securities available-for-sale. Currently, loan losses are recognized using an "incurred loss" methodology. Under ASU 2016-13, the methodology will change to a current expected loss over the life of the loan. Currently, credit losses on available-for-sale securities reduce the carrying value of the instrument and cannot be reversed. Under ASU 2016-13, the amount of the credit loss is carried as a valuation allowance and can be reversed. For Arrow, the standard is effective for the first quarter of 2020 and early adoption is allowed in 2019. The Company is currently evaluating the impact of the pending adoption of the ASU on its consolidated financial statements. The initial adjustment will not be reported in earnings, but as the cumulative effect of a change in accounting principle.

ASU 2016-15 "Statement of Cash Flows" provides guidance on the classification of eight specific cash flow issues in order to increase consistency in reporting. Currently, GAAP is either unclear or does not include specific guidance on the cash flow issues addressed in this Update. Arrow currently reports the specifically identified cash flow transactions using the appropriate classification as outlined in the Update. For Arrow, the standard becomes effective in the first quarter of 2017. We do not expect that the adoption of this change in classification for financial reporting will have a material impact on our financial position or the results of operations in periods subsequent to its adoption.