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LOANS AND ALLOWANCE FOR LOAN LOSSES - Troubled Debt Restructurings Narrative (Details) |  | 12 Months Ended
--- | --- | ---
May 31, 2020 | Dec. 31, 2021 USD ($) instrument borrower loan | Dec. 31, 2020 USD ($) loan borrower
Financing Receivable, Modifications [Line Items] |  |  |
Financing Receivable, Loan Forebearances, Loan Balance | $ |  | $ 242,500,000 |
Recorded investment in troubled debt restructurings | $ |  | 10,300,000 | $ 6,700,000
Specific reserves allocated to troubled debt restructuring | $ |  | 1,900,000 | 400,000
Troubled debt restructurings accruing interest under modified terms | $ |  | 5,600,000 | 2,800,000
Troubled debt restructurings on non-accrual status | $ |  | 4,700,000 | 3,900,000
Additional amounts committed to customers with loans classified as troubled debt restructurings | $ |  | $ 0 | $ 0
Number of Loans |  | 6 | 15
Increase in allowance for loan losses related to troubled debt restructurings | $ |  | $ 1,700,000 | $ 200,000
Charge offs | $ |  | $ 0 | $ 0
Number of days past due after which a loan is considered to be in payment default |  | 90 days |
Financing Receivable | Customer Concentration Risk | Chemung |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Concentration Risk, Percentage | 15.77% |  |
Extended Maturity | Commercial and industrial |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans |  |  | 2
Extended Maturity and Interest Rate Below Market Reduction | Commercial and industrial |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans |  |  | 1
Interest Rate Below Market Reduction | Commercial and industrial |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans |  |  | 2
Interest Rate Below Market Reduction | Commercial and industrial | Non-accrual Status |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans |  |  | 1
Payment Deferral |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Financing receivable, modifications, number of days past due |  |  | 30 days
Residential Mortgage | Principal Forgiveness |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans |  |  | 1
Residential Mortgage | Payment Deferral |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans |  |  | 3
Residential Mortgage | Payment Deferral | Non-accrual Status |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans |  |  | 3
Residential Mortgage | Payment Deferral | Substandard | Non-accrual Status |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans |  |  | 2
Residential Mortgage | Payment Deferral | Substandard | Non-accrual Status | 30 - 59 Days Past Due |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans |  |  | 1
Commercial mortgages | Payment Deferral |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans |  |  | 4
Financing receivable, modifications, number of borrowers | borrower |  |  | 3
Commercial mortgages | Payment Deferral | Substandard | Non-accrual Status |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans |  |  | 3
Commercial mortgages | Payment Deferral | Substandard | Non-accrual Status | 30 - 59 Days Past Due |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans |  |  | 2
Home equity lines and loans | Payment Deferral |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans |  |  | 3
Home equity lines and loans | Payment Deferral | Substandard | Non-accrual Status |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans |  |  | 3
Commercial And Consumer Portfolio Segment |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Financing receivable, number of loans remaining in modified status, modified more than once | borrower |  | 0 |
Consumer Loans | Home equity lines and loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans |  |  | 3
Commercial, and Agricultural | Commercial and industrial |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans |  | 2 | 4
Commercial, and Agricultural | Commercial mortgages |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | instrument |  | 4 |
Commercial, and Agricultural | Commercial And Industrial |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | instrument |  | 2 |

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