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Regulatory Matters (Tables) | 12 Months Ended
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Dec. 31, 2017
Banking and Thrift [Abstract] |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations | The actual capital amounts and ratios for Arrow and its subsidiary banks, Glens Falls National Bank and Trust Company (“Glens Falls National”) and Saratoga National Bank and Trust Company (“Saratoga National”), are presented in the table below as of December 31, 2017 and 2016:
| Actual |  | Minimum Amounts For Capital Adequacy Purposes |  | Minimum Amounts To Be Well-Capitalized
| Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
As of December 31, 2017 |  |  |  |  |  |  |  |  |  |  |
Total Capital (to Risk Weighted Assets): |  |  |  |  |  |  |  |  |  |  |
Arrow | $ | 278,163 |  |  | 15.0 | % |  | $ | 172,461 |  |  | 9.3 | % |  | $ | 185,442 |  |  | 10.0 | %
Glens Falls National | 220,275 |  |  | 14.6 | % |  | 140,312 |  |  | 9.3 | % |  | 150,873 |  |  | 10.0 | %
Saratoga National | 48,822 |  |  | 14.0 | % |  | 32,432 |  |  | 9.3 | % |  | 34,873 |  |  | 10.0 | %
Tier I Capital (to Risk Weighted Assets): |  |  |  |  |  |  |  |  |  |  |
Arrow | 259,378 |  |  | 14.0 | % |  | 135,247 |  |  | 7.3 | % |  | 148,216 |  |  | 8.0 | %
Glens Falls National | 205,200 |  |  | 13.6 | % |  | 110,144 |  |  | 7.3 | % |  | 120,706 |  |  | 8.0 | %
Saratoga National | 45,311 |  |  | 13.0 | % |  | 25,444 |  |  | 7.3 | % |  | 27,884 |  |  | 8.0 | %
Tier I Capital (to Average Assets): |  |  |  |  |  |  |  |  |  |  |
Arrow | 259,378 |  |  | 9.5 | % |  | 109,212 |  |  | 4.0 | % |  | 136,515 |  |  | 5.0 | %
Glens Falls National | 205,200 |  |  | 9.1 | % |  | 90,198 |  |  | 4.0 | % |  | 112,747 |  |  | 5.0 | %
Saratoga National | 45,311 |  |  | 9.4 | % |  | 19,281 |  |  | 4.0 | % |  | 24,102 |  |  | 5.0 | %
Common Equity Tier 1 Capital (to Risk Weighted Assets): |  |  |  |  |  |  |  |  |  |  |
Arrow | 239,326 |  |  | 12.9 | % |  | 107,604 |  |  | 5.8 | % |  | 120,591 |  |  | 6.5 | %
Glens Falls National | 205,148 |  |  | 13.6 | % |  | 87,490 |  |  | 5.8 | % |  | 98,049 |  |  | 6.5 | %
Saratoga National | 45,311 |  |  | 13.0 | % |  | 20,216 |  |  | 5.8 | % |  | 22,656 |  |  | 6.5 | %
As of December 31, 2016 |  |  |  |  |  |  |  |  |  |  |
Total Capital (to Risk Weighted Assets): |  |  |  |  |  |  |  |  |  |  |
Arrow | 258,653 |  |  | 15.2 | % |  | 146,343 |  |  | 8.6 | % |  | 170,166 |  |  | 10.0 | %
Glens Falls National | 205,573 |  |  | 15.0 | % |  | 117,862 |  |  | 8.6 | % |  | 137,049 |  |  | 10.0 | %
Saratoga National | 42,168 |  |  | 12.8 | % |  | 28,332 |  |  | 8.6 | % |  | 32,944 |  |  | 10.0 | %
Tier I Capital (to Risk Weighted Assets): |  |  |  |  |  |  |  |  |  |  |
Arrow | 241,523 |  |  | 14.1 | % |  | 113,053 |  |  | 6.6 | % |  | 137,034 |  |  | 8.0 | %
Glens Falls National | 191,679 |  |  | 14.0 | % |  | 90,363 |  |  | 6.6 | % |  | 109,531 |  |  | 8.0 | %
Saratoga National | 39,050 |  |  | 11.9 | % |  | 21,658 |  |  | 6.6 | % |  | 26,252 |  |  | 8.0 | %
Tier I Capital (to Average Assets): |  |  |  |  |  |  |  |  |  |  |
Arrow | 241,523 |  |  | 9.5 | % |  | 101,694 |  |  | 4.0 | % |  | 127,117 |  |  | 5.0 | %
Glens Falls National | 191,679 |  |  | 9.1 | % |  | 84,255 |  |  | 4.0 | % |  | 105,318 |  |  | 5.0 | %
Saratoga National | 39,050 |  |  | 8.9 | % |  | 17,551 |  |  | 4.0 | % |  | 21,938 |  |  | 5.0 | %
Common Equity Tier 1 Capital (to Risk Weighted Assets): |  |  |  |  |  |  |  |  |  |  |
Arrow | 221,472 |  |  | 13.0 | % |  | 86,885 |  |  | 5.1 | % |  | 110,736 |  |  | 6.5 | %
Glens Falls National | 191,628 |  |  | 13.9 | % |  | 70,310 |  |  | 5.1 | % |  | 89,610 |  |  | 6.5 | %
Saratoga National | 39,050 |  |  | 11.9 | % |  | 16,736 |  |  | 5.1 | % |  | 21,330 |  |  | 6.5 | %

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