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COMMITMENTS AND CONTINGENT LIABILITIES - Legal Proceeding and Other Contingent Liabilities (Details) |  |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended |  |  |  |
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Jan. 20, 2022 USD ($) | Oct. 08, 2021 USD ($) | Apr. 30, 2021 USD ($) | Aug. 31, 2020 USD ($) | Aug. 14, 2020 claim | Jul. 16, 2020 USD ($) | May 01, 2020 USD ($) | Feb. 04, 2020 USD ($) | Jan. 10, 2020 | Dec. 10, 2019 USD ($) | Nov. 26, 2019 | Aug. 30, 2019 USD ($) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 USD ($) | Sep. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 USD ($) | May 14, 2021 USD ($) | Dec. 01, 2020 USD ($) | Apr. 30, 2020 USD ($) | Oct. 31, 2019 USD ($)
Commitments and Contingent Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation-related expenses |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,200,000 |  |  |  |  | $ 1,200,000 |  |  |  |  |
Deposit activity, the Bank's potential exposure for fraudulent activity |  |  |  |  |  |  |  |  |  |  |  |  | 18,500,000 |  |  |  |  | 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 |  |  |  |  | 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 |  |  |  |  | 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 |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,900,000 | $ 547,000 |  |  |  |
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 |  |  |  |  |
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 |  |  |  |  |
Southwestern Complaint |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingent Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Constructive trust, funds in question, per complaint |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,800,000
Number of days postponed in filing the answer |  |  |  |  |  |  |  |  | 14 days |  | 14 days |  |  |  |  |  |  |  |  |  |  |  |
Amount of counterclaim/cross-claim damages sought by the Pioneer Parties |  |  |  |  |  |  | $ 15,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cachet Assertion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingent Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Complaint, damages sought | $ 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 |  |  |  |  |  |  |  | $ 15,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of cases dismissed | claim |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Chemung Canal Trust Company Complaint |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingent Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Complaint, damages sought |  |  |  |  |  |  |  | $ 4,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of cases dismissed | claim |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of claims | claim |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  | $ 336,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
TBC Complaint |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingent Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Complaint, amount Bank seeks to recover |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 34,100,000 |  |
ASIC Complaint |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingent Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Complaint, damages sought |  |  | $ 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingent Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, estimate of possible loss |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  | 0 |  |  |  |  |
Minimum | Southwestern Complaint |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingent Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Complaint, damages sought |  |  |  |  |  |  |  |  |  | $ 9,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum | Southwestern Second Amended Complaint |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingent Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Complaint, damages sought |  |  |  |  |  | $ 9,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum | Southwestern Third Amended Complaint [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingent Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Complaint, damages sought |  | $ 39,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum | NatPay Complaint |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingent Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Complaint, damages sought |  |  |  |  |  |  |  |  |  | $ 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum | Natpay Amended Complaint [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingent Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Complaint, damages sought |  | $ 11,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingent Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, estimate of possible loss |  |  |  |  |  |  |  |  |  |  |  |  | $ 51,300,000 |  |  |  |  | $ 51,300,000 |  |  |  |  |

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- Definition The amount of potential monetary penalties related to damages sought by the plaintiffs in the Southwestern, NatPay, DOJ and the AHX proceedings. + References No definition available. + Details
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- Definition The value of funds the Bank is holding per the assertion made by a third party in bankruptcy court proceedings. + References No definition available. + Details
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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 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. + References No definition available. + Details
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- Definition The maximum potential monetary penalties related to investigation by the New York State Department of Financial Services (the "NYSDFS"). + References No definition available. + Details
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- Definition With respect to the deposit activity, the Bank's potential exposure for fraudulent activity. + References No definition available. + Details
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- Definition With respect to the lending activity, the Bank's potential exposure for fraudulent activity. + References No definition available. + Details
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- Definition The partial recovery recognized related to the charge-off of the Mann Entities commercial loan relationships. + 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 set off of fraudulent activity of deposit accounts with other accounts. + 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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