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Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract] |  |
Schedule of Finite-Lived Intangible Assets | The following table presents information on Arrow’s other intangible assets (other than goodwill) as of December 31, 2016, 2015 and 2014:
| Depositor Intangibles 1 |  | Mortgage Servicing Rights 2 |  | Customer Intangibles 1 |  | Total
Gross Carrying Amount, December 31, 2016 | $ | 2,247 |  |  | $ | 1,968 |  |  | $ | 4,382 |  |  | $ | 8,597 |
Accumulated Amortization | (2,247 | ) |  | (1,403 | ) |  | (2,251 | ) |  | (5,901 | )
Net Carrying Amount, December 31, 2016 | $ | — |  |  | $ | 565 |  |  | $ | 2,131 |  |  | $ | 2,696 |
Gross Carrying Amount, December 31, 2015 | $ | 2,247 |  |  | $ | 1,822 |  |  | $ | 4,382 |  |  | $ | 8,451 |
Accumulated Amortization | (2,247 | ) |  | (1,143 | ) |  | (1,954 | ) |  | (5,344 | )
Net Carrying Amount, December 31, 2015 | $ | — |  |  | $ | 679 |  |  | $ | 2,428 |  |  | $ | 3,107 |
Rollforward of Intangible Assets: |  |  |  |  |  |  |
Balance, December 31, 2013 | $ | 61 |  |  | $ | 960 |  |  | $ | 3,119 |  |  | $ | 4,140 |
Intangible Assets Acquired | — |  |  | 133 |  |  | — |  |  | 133 |
Amortization of Intangible Assets | (51 | ) |  | (261 | ) |  | (336 | ) |  | (648 | )
Balance, December 31, 2014 | 10 |  |  | 832 |  |  | 2,783 |  |  | 3,625 |
Intangible Assets Acquired | — |  |  | 107 |  |  | — |  |  | 107 |
Intangible Assets Disposed | — |  |  | — |  |  | (38 | ) |  | (38 | )
Amortization of Intangible Assets | (10 | ) |  | (260 | ) |  | (317 | ) |  | (587 | )
Balance, December 31, 2015 | — |  |  | 679 |  |  | 2,428 |  |  | 3,107 |
Intangible Assets Acquired | — |  |  | 146 |  |  | — |  |  | 146 |
Intangible Assets Disposed | — |  |  | — |  |  | — |  |  | — |
Amortization of Intangible Assets | — |  |  | (260 | ) |  | (297 | ) |  | (557 | )
Balance, December 31, 2016 | $ | — |  |  | $ | 565 |  |  | $ | 2,131 |  |  | $ | 2,696 |
1 Amortization of depositor intangibles and customer intangibles are reported in the consolidated statements of income as a component of other operating expense. 2 Amortization of mortgage servicing rights is reported in the consolidated statements of income as a reduction of mortgage servicing fee income, which is included with fees for other services to customers. |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense |  | The following table presents the remaining estimated annual amortization expense for Arrow's intangible assets as of December 31, 2016:
|  | Mortgage Servicing Rights |  | Customer Intangibles |  | Total
Estimated Annual Amortization Expense: |  |  |  |  |  |
2017 |  | $ | 215 |  |  | $ | 276 |  |  | $ | 491 |
2018 |  | 160 |  |  | 259 |  |  | 419 |
2019 |  | 87 |  |  | 242 |  |  | 329 |
2020 |  | 56 |  |  | 225 |  |  | 281 |
2021 |  | 34 |  |  | 208 |  |  | 242 |
2022 and beyond |  | 13 |  |  | 921 |  |  | 934 |
Total |  | $ | 565 |  |  | $ | 2,131 |  |  | $ | 2,696 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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