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Regulatory Matters (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [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, 2020 and 2019:
| Actual |  | Minimum Amounts For Capital Adequacy Purposes (including "capital conservation buffer") |  | Minimum Amounts To Be Well-Capitalized
| Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
As of December 31, 2020 |  |  |  |  |  |  |  |  |  |  |
Total Capital (to Risk Weighted Assets): |  |  |  |  |  |  |  |  |  |  |
Arrow | $ | 364,988 |  |  | 15.5 | % |  | $ | 247,250 |  |  | 10.5 | % |  | $ | 235,476 |  |  | 10.0 | %
Glens Falls National | 273,801 |  |  | 15.2 | % |  | 189,139 |  |  | 10.5 | % |  | 180,132 |  |  | 10.0 | %
Saratoga National | 78,022 |  |  | 14.2 | % |  | 57,692 |  |  | 10.5 | % |  | 54,945 |  |  | 10.0 | %
Tier I Capital (to Risk Weighted Assets): |  |  |  |  |  |  |  |  |  |  |
Arrow | 335,756 |  |  | 14.2 | % |  | 200,981 |  |  | 8.5 | % |  | 189,158 |  |  | 8.0 | %
Glens Falls National | 251,419 |  |  | 13.9 | % |  | 153,745 |  |  | 8.5 | % |  | 144,702 |  |  | 8.0 | %
Saratoga National | 71,172 |  |  | 13.0 | % |  | 46,536 |  |  | 8.5 | % |  | 43,798 |  |  | 8.0 | %
| Actual |  | Minimum Amounts For Capital Adequacy Purposes (including "capital conservation buffer") |  | Minimum Amounts To Be Well-Capitalized
| Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
Tier I Capital (to Average Assets): |  |  |  |  |  |  |  |  |  |  |
Arrow | 335,756 |  |  | 9.1 | % |  | 147,585 |  |  | 4.0 | % |  | 184,481 |  |  | 5.0 | %
Glens Falls National | 251,419 |  |  | 8.7 | % |  | 115,595 |  |  | 4.0 | % |  | 144,494 |  |  | 5.0 | %
Saratoga National | 71,172 |  |  | 8.9 | % |  | 31,987 |  |  | 4.0 | % |  | 39,984 |  |  | 5.0 | %
Common Equity Tier 1 Capital (to Risk Weighted Assets): |  |  |  |  |  |  |  |  |  |  |
Arrow | 315,696 |  |  | 13.4 | % |  | 164,916 |  |  | 7.0 | % |  | 153,136 |  |  | 6.5 | %
Glens Falls National | 251,359 |  |  | 13.9 | % |  | 126,584 |  |  | 7.0 | % |  | 117,542 |  |  | 6.5 | %
Saratoga National | 71,172 |  |  | 13.0 | % |  | 38,323 |  |  | 7.0 | % |  | 35,586 |  |  | 6.5 | %
As of December 31, 2019 |  |  |  |  |  |  |  |  |  |  |
Total Capital (to Risk Weighted Assets): |  |  |  |  |  |  |  |  |  |  |
Arrow | $ | 330,657 |  |  | 14.8 | % |  | $ | 234,588 |  |  | 10.5 | % |  | $ | 223,417 |  |  | 10.0 | %
Glens Falls National | 254,438 |  |  | 14.5 | % |  | 184,248 |  |  | 10.5 | % |  | 175,474 |  |  | 10.0 | %
Saratoga National | 65,295 |  |  | 13.6 | % |  | 50,412 |  |  | 10.5 | % |  | 48,011 |  |  | 10.0 | %
Tier I Capital (to Risk Weighted Assets): |  |  |  |  |  |  |  |  |  |  |
Arrow | 309,469 |  |  | 13.8 | % |  | 190,615 |  |  | 8.5 | % |  | 179,402 |  |  | 8.0 | %
Glens Falls National | 237,546 |  |  | 13.5 | % |  | 149,566 |  |  | 8.5 | % |  | 140,768 |  |  | 8.0 | %
Saratoga National | 60,999 |  |  | 12.7 | % |  | 40,826 |  |  | 8.5 | % |  | 38,425 |  |  | 8.0 | %
Tier I Capital (to Average Assets): |  |  |  |  |  |  |  |  |  |  |
Arrow | 309,469 |  |  | 10.0 | % |  | 123,788 |  |  | 4.0 | % |  | 154,735 |  |  | 5.0 | %
Glens Falls National | 237,546 |  |  | 9.5 | % |  | 100,019 |  |  | 4.0 | % |  | 125,024 |  |  | 5.0 | %
Saratoga National | 60,999 |  |  | 9.6 | % |  | 25,416 |  |  | 4.0 | % |  | 31,770 |  |  | 5.0 | %
Common Equity Tier 1 Capital (to Risk Weighted Assets): |  |  |  |  |  |  |  |  |  |  |
Arrow | 289,409 |  |  | 12.9 | % |  | 157,044 |  |  | 7.0 | % |  | 145,826 |  |  | 6.5 | %
Glens Falls National | 237,486 |  |  | 13.5 | % |  | 123,141 |  |  | 7.0 | % |  | 114,345 |  |  | 6.5 | %
Saratoga National | 60,999 |  |  | 12.7 | % |  | 33,621 |  |  | 7.0 | % |  | 31,220 |  |  | 6.5 | %

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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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