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LOANS AND ALLOWANCE FOR LOAN LOSSES - Troubled Debt Restructuring Narrative (Details) |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
May 31, 2020 USD ($) | Sep. 30, 2021 USD ($) borrower contract loan | Sep. 30, 2020 loan contract borrower | Sep. 30, 2021 USD ($) borrower loan contract | Sep. 30, 2020 borrower contract | Dec. 31, 2020 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Loan forebearances, loan balance | $ | $ 242,500,000 |  |  |  |  |
Financing receivable, troubled debt restructuring | $ |  | $ 10,800,000 |  | $ 10,800,000 |  | $ 6,700,000
Financing receivable, troubled debt restructuring, purchased with credit deterioration, increase | $ |  | 2,200,000 |  | 2,200,000 |  | 400,000
Financing receivable, modifications, recorded investment, still accruing | $ |  | 5,700,000 |  | 5,700,000 |  | 2,800,000
Financing receivable, modifications, recorded investment, nonaccrual status | $ |  | 5,100,000 |  | 5,100,000 |  | 3,900,000
Additional amounts committed to customers with loans classified as troubled debt restructurings | $ |  | $ 0 |  | $ 0 |  | $ 0
Number of loans |  | 2 | 3 | 6 | 15 |
Financing receivable, troubled debt restructuring, subsequent default, number of contracts | contract |  | 0 | 0 | 0 | 0 |
Payment deferral |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Financing receivable, modifications, number of days past due |  |  | 30 days |  |  |
Commercial and industrial | Extended maturity |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Number of loans |  |  | 2 |  |  |
Commercial and industrial | Interest rate below market reduction |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Number of loans |  |  | 1 |  |  |
Residential mortgages |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Number of loans |  |  | 1 |  |  |
Commercial mortgages | Payment deferral |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Number of loans |  |  | 4 |  |  |
Financing receivable, modifications, number of borrowers | borrower |  |  | 3 |  |  |
Residential mortgages | Payment deferral |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Number of loans |  |  | 3 |  |  |
Residential mortgages | Non-accrual Status | Payment deferral |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Number of loans |  |  | 3 |  |  |
Home equity lines and loans | Payment deferral |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Number of loans |  |  | 3 |  |  |
Non-accrual Status | Commercial and industrial | Interest rate below market reduction |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Number of loans | borrower |  |  | 1 |  |  |
Substandard | Commercial and industrial | Interest rate below market reduction |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Number of loans |  |  | 2 |  |  |
Substandard | Commercial mortgages | Non-accrual Status | Payment deferral |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Number of loans |  |  | 3 |  |  |
Substandard | Commercial mortgages | Non-accrual Status | Payment deferral | 30 - 59 Days Past Due |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Number of loans |  |  | 2 |  |  |
Substandard | Residential mortgages | Non-accrual Status | Payment deferral |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Number of loans |  |  | 2 |  |  |
Substandard | Residential mortgages | Non-accrual Status | Payment deferral | 30 - 59 Days Past Due |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Number of loans |  |  | 1 |  |  |
Substandard | Home equity lines and loans | Non-accrual Status | Payment deferral |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Number of loans |  |  | 3 |  |  |
Commercial and consumer portfolio segment |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Number of loans remaining in modified status | borrower |  | 11 |  | 11 |  |
Loan balance remaining in modified status | $ |  | $ 3,000,000 |  | $ 3,000,000 |  |
Number of loans remaining in modified status, modified more than once | borrower |  | 5 |  | 5 |  |
Loan balance remaining in modified status, modified more than once | $ |  | $ 2,900,000 |  | $ 2,900,000 |  |
Commercial and agricultural: | Commercial and industrial |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Number of loans |  | 2 |  | 2 |  |
Commercial and agricultural: | Commercial mortgages |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Number of loans | borrower |  |  |  | 2 |  |
Financing Receivable | Chemung | Customer Concentration Risk |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Concentration risk percentage (in percentage) | 15.77% |  |  | 0.20% |  |

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