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COMMITMENTS AND CONTINGENT LIABILITIES - Legal Proceeding and Other Contingent Liabilities (Details)													3 Months Ended					9 Months Ended
	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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The amount of potential monetary penalties related to damages sought by the plaintiffs in the Southwestern, NatPay, DOJ and the AHX proceedings.

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The value of funds the Bank is holding per the assertion made by a third party in bankruptcy court proceedings.

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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.

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The total alleged amount stolen per the complaint filed by third party.

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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.

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The amount of counterclaim/cross-claim damages sought by the defendant in a response to the plaintiff's claim.

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The maximum potential monetary penalties related to investigation by the New York State Department of Financial Services (the "NYSDFS").

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With respect to the deposit activity, the Bank's potential exposure for fraudulent activity.

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With respect to the lending activity, the Bank's potential exposure for fraudulent activity.

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The partial recovery recognized related to the charge-off of the Mann Entities commercial loan relationships.

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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.

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The amount of set off of fraudulent activity of deposit accounts with other accounts.

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The amount of set off of fraudulent activity of deposit accounts with other accounts primarily covers another bank returning and calling back and partially covers overdrafts or negative accounts.

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The amount of commercial loan relationships with a customer for which the Bank is the originating lender and which there is potentially fraudulent activity.

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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.

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The amount or range of possible amounts of gain that could be realized upon the resolution of a contingency.

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The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses.

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