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COMMITMENTS AND CONTINGENT LIABILITIES - Legal Proceeding and Other Contingent Liabilities (Details) - USD ($)
 3 Months Ended 48 Months Ended
Apr. 26, 2023
Apr. 13, 2023
Feb. 16, 2023
Aug. 15, 2022
Dec. 01, 2020
Aug. 31, 2020
Feb. 04, 2020
Aug. 30, 2019
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2023
May 14, 2021
Apr. 30, 2020
Commitments and Contingent Liabilities                                  
Litigation-related expense                 $ 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                 576,000 $ 542,000              
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 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                      
Minimum                                  
Commitments and Contingent Liabilities                                  
Loss contingency, estimate of possible loss                 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                        
Minimum | Granite Solutions Groupe, Inc.                                  
Commitments and Contingent Liabilities                                  
Complaint, damages sought by plaintiff       $ 1,000,000                          
Maximum                                  
Commitments and Contingent Liabilities                                  
Loss contingency, estimate of possible loss                 $ 54,400,000           $ 54,400,000