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LOANS AND ALLOWANCE FOR LOAN LOSSES - Troubled Debt Restructuring Narrative (Details) |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
May 31, 2020 USD ($) | Jun. 30, 2022 USD ($) borrower | Jun. 30, 2021 USD ($) borrower | Jun. 30, 2022 USD ($) contract borrower | Jun. 30, 2021 USD ($) borrower contract | Dec. 31, 2021 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Financing receivable, loan forebearances, loan balance | $ 242,500,000 |  |  |  |  |
Financing receivable, troubled debt restructuring |  | $ 6,200,000 |  | $ 6,200,000 |  | $ 10,300,000
Financing receivable, troubled debt restructuring, purchased with credit deterioration, increase |  | 300,000 |  | 300,000 |  | 1,900,000
Financing receivable, modifications, recorded investment, still accruing |  | 1,700,000 |  | 1,700,000 |  | 5,600,000
Financing receivable, modifications, recorded investment, nonaccrual status |  | 4,500,000 |  | 4,500,000 |  | 4,700,000
Additional amounts committed to customers with loans classified as troubled debt restructurings |  | 0 |  | 0 |  | $ 0
Number of Loans | borrower |  |  | 2 |  | 4 |
Increase in allowance for loan losses related to troubled debt restructurings |  |  | $ 1,700,000 |  | $ 1,700,000 |
Charge offs |  | 831,000 | 227,000 | $ 1,029,000 | $ 416,000 |
Number of days past due after which a loan is considered to be in payment default |  |  |  | 90 days |  |
Financing receivable, troubled debt restructuring, subsequent default, number of contracts | contract |  |  |  | 0 | 0 |
Commercial Mortgages |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Charge offs |  | $ 687,000 | $ 0 | $ 687,000 | $ 0 |
Commercial Mortgages | Commercial mortgages, other |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Number of Loans | borrower |  | 0 | 2 | 0 | 4 |
Charge offs |  |  | $ 0 |  | $ 0 |
Financing Receivable | Chemung | Customer Concentration Risk |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Concentration risk percentage (in percentage) | 15.77% |  |  |  |  |

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