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COMMITMENTS AND CONTINGENT LIABILITIES - Legal Proceeding and Other Contingent Liabilities (Details)										3 Months Ended				6 Months Ended
	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 ($)	Nov. 26, 2019	Aug. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 01, 2020 USD ($)	Apr. 30, 2020 USD ($)	Jan. 21, 2020 USD ($)	Oct. 31, 2019 USD ($)
Commitments and Contingent Liabilities
Deposit activity, the Bank's potential exposure for fraudulent activity														$ 18,500,000
Amount set off												$ 16,000,000
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			$ 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
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
Value of funds Bank is holding per assertion made by Cachet																		$ 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
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 | NatPay Complaint
Commitments and Contingent Liabilities
Complaint, damages sought							$ 4,000,000

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Amount of additional charge on provision for loan losses.

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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 funds in question related to the complaint filed, in which the plaintiff is claiming they are entitled to a constructive trust limiting how the Pioneer Parties distribute the funds in question.

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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 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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