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COMMITMENTS AND CONTINGENT LIABILITIES - Legal Proceeding and Other Contingent Liabilities (Details) - USD ($) |  |  |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 51 Months Ended |  |  |
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Nov. 15, 2023 | Apr. 26, 2023 | Apr. 13, 2023 | Feb. 16, 2023 | Dec. 01, 2020 | Aug. 31, 2020 | Feb. 04, 2020 | Aug. 30, 2019 | Dec. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2021 | Sep. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2023 | May 14, 2021 | Apr. 30, 2020 | Sep. 30, 2019
Commitments and Contingent Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation-related expense |  |  |  |  |  |  |  |  | $ 0 | $ 0 |  |  |  |  | $ 0 | $ 0 |  |  |  |
Deposit activity, the Bank's potential exposure for fraudulent activity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 18,500,000
Amount set off |  |  |  |  |  |  |  |  |  |  |  | $ 16,000,000.0 |  |  |  |  |  |  |  |
Another bank returning/ calling back |  |  |  |  |  |  |  | $ 15,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Lending activity, the Bank's potential exposure for fraudulent activity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,800,000
Amount of commercial loan relationships with a customer for which the Bank is the originating lender and which there is potentially fraudulent activity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 35,800,000
Non-interest expense associated with potentially fraudulent activity |  |  |  |  |  |  |  |  |  |  |  | $ 2,500,000 |  |  |  |  |  |  |  |
Additional charges on non interest expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |
Additional charge on provision for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Additional Recoveries on Charge off of Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Provision for loan losses related to charge-off the entire principal balance owed to the Bank related to the customer's commercial loan relationship as it relates to the potentially fraudulent activity |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,800,000 |  |  |  |  |  |
Partial recovery recognized related to the charge-off of the Mann Entities commercial loan relationships |  |  |  |  |  |  |  |  |  |  | $ 34,000 |  | $ 1,700,000 |  |  |  |  |  |  |
Insurance recoveries related to partial reimbursement of defense costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,200,000 | $ 1,500,000 |  |  |  |
Bank's Interest in cash and securities forfeited by Michael Mann, in which Bank filed petition to adjudicate the validity of the security interest in the forfeited property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,900,000 |  |
Maximum potential monetary penalties related to investigation by the NYSDFS |  |  |  |  |  |  |  |  | 30,000,000.0 |  |  |  |  |  | 30,000,000.0 |  | 30,000,000.0 |  |  |
Amount of potential monetary penalties related to damages sought by plaintiffs in the Southwestern, NatPay, DOJ and AHX proceedings |  |  |  |  |  |  |  |  | 15,000,000.0 |  |  |  |  |  | 15,000,000.0 |  | 15,000,000.0 |  |  |
Southwestern Third Amended Complaint |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingent Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Complaint, minimum damages sought by defendant |  | $ 13,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natpay Amended Complaint |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingent Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Complaint, compensatory damages sought, minimum, by plaintiff |  |  | $ 3,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cachet Financial Services Amended Complaint |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingent Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Complaint, damages sought by plaintiff |  |  |  | $ 25,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Alleged amount stolen per Cachet complaint |  |  |  | 26,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Portion of alleged stolen funds Bank is holding per assertion made by Cachet |  |  |  | 8,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assertion made by a third party of the amount of actual damages |  |  |  | $ 8,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Berkshire Bank Complaint |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingent Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Complaint, damages sought by plaintiff |  |  |  |  |  |  | $ 15,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Chemung Canal Trust Company Complaint |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingent Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Complaint, damages sought by plaintiff |  |  |  |  |  |  | $ 4,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
DOJ Complaint |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingent Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of funds in a third party account, claimed to be wrongfully seized by the Company and Bank to apply towards debts allegedly owed to the Bank |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,300,000 |
AXH Complaint |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingent Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Complaint, damages sought by plaintiff |  |  |  |  |  | $ 336,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
TBC Complaint |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingent Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment made to plaintiff pursuant to settlement agreement | $ 5,950,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingent Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, estimate of possible loss |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  | 0 |  | 0 |  |  |
Minimum | Southwestern Third Amended Complaint |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingent Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Complaint, damages sought by plaintiff |  | $ 39,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum | Natpay Amended Complaint |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingent Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Complaint, damages sought by plaintiff |  |  | $ 11,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum | TBC Complaint |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingent Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Complaint, damages sought by plaintiff |  |  |  |  | $ 34,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingent Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, estimate of possible loss |  |  |  |  |  |  |  |  | $ 54,400,000 |  |  |  |  |  | $ 54,400,000 |  | $ 54,400,000 |  |  |

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- Definition The amount of the Bank's interest in cash and securities forfeited by Michael Mann in which the Bank filed a petition that alleges it has a valid security interest in the forfeited property. + References No definition available. + Details
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- Definition The provision for loan losses related to charge-off the entire principal balance owed to the Bank related to the customer's commercial loan relationship as it relates to the potentially fraudulent activity. + References No definition available. + Details
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- Definition The amount of commercial loan relationships with a customer for which the Bank is the originating lender and which there is potentially fraudulent activity. + References No definition available. + Details
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- Definition The non-interest expense expected to be recognized related to the potentially fraudulent activity, which is based on the difference between the net negative balance and the setoff amount. + References No definition available. + Details
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