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Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
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, 2020, 2019 and 2018:
|  |  | Mortgage Servicing Rights 1 |  | Customer Intangibles 2 |  | Total
Gross Carrying Amount, December 31, 2020 |  |  | $ | 2,850 |  |  | $ | 4,382 |  |  | $ | 9,479 |
Accumulated Amortization |  |  | (2,018) |  |  | (3,264) |  |  | (7,529) |
Net Carrying Amount, December 31, 2020 |  |  | $ | 832 |  |  | $ | 1,118 |  |  | $ | 1,950 |
Gross Carrying Amount, December 31, 2019 |  |  | $ | 2,229 |  |  | $ | 4,382 |  |  | $ | 8,858 |
Accumulated Amortization |  |  | (1,913) |  |  | (3,037) |  |  | (7,197) |
Net Carrying Amount, December 31, 2019 |  |  | $ | 316 |  |  | $ | 1,345 |  |  | $ | 1,661 |
Rollforward of Intangible Assets: |  |  |  |  |  |  |
Balance, December 31, 2017 |  |  | $ | 437 |  |  | $ | 1,852 |  |  | $ | 2,289 |
Intangible Assets Acquired |  |  | — |  |  | — |  |  | — |
Intangible Assets Disposed |  |  | — |  |  | — |  |  | — |
Amortization of Intangible Assets |  |  | (175) |  |  | (262) |  |  | (437) |
Balance, December 31, 2018 |  |  | 262 |  |  | 1,590 |  |  | 1,852 |
Intangible Assets Acquired |  |  | 168 |  |  | — |  |  | 168 |
Intangible Assets Disposed |  |  | — |  |  | — |  |  | — |
Amortization of Intangible Assets |  |  | (114) |  |  | (245) |  |  | (359) |
Balance, December 31, 2019 |  |  | 316 |  |  | 1,345 |  |  | 1,661 |
Intangible Assets Acquired |  |  | 621 |  |  | — |  |  | 621 |
Intangible Assets Disposed |  |  | — |  |  | — |  |  | — |
Amortization of Intangible Assets |  |  | (105) |  |  | (227) |  |  | (332) |
Balance, December 31, 2020 |  |  | $ | 832 |  |  | $ | 1,118 |  |  | $ | 1,950 |
1 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. 2 Amortization of customer intangibles are reported in the Consolidated Statements of Income as a component of other operating expense.
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, 2020:
|  | Mortgage Servicing Rights |  | Customer Intangibles |  | Total
Estimated Annual Amortization Expense: |  |  |  |  |  |
2021 |  | $ | 181 |  |  | $ | 211 |  |  | $ | 392 |
2022 |  | 160 |  |  | 193 |  |  | 353 |
2023 |  | 140 |  |  | 176 |  |  | 316 |
2024 |  | 132 |  |  | 155 |  |  | 287 |
2025 |  | 132 |  |  | 107 |  |  | 239 |
2026 and beyond |  | 87 |  |  | 276 |  |  | 363 |
Total |  | $ | 832 |  |  | $ | 1,118 |  |  | $ | 1,950 |

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