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COMMITMENTS AND CONTINGENT LIABILITIES - Legal Proceeding and Other Contingent Liabilities (Details) - USD ($)
 3 Months Ended 15 Months Ended
Apr. 26, 2023
Apr. 13, 2023
Feb. 16, 2023
Aug. 31, 2020
Feb. 04, 2020
Aug. 30, 2019
Mar. 31, 2025
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2025
May 14, 2021
COMMITMENTS AND CONTINGENT LIABILITIES                          
Litigation-related expense                       $ 0  
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              
Non-interest expense associated with potentially fraudulent activity                   2,500,000      
Additional charges on non interest expense             $ 0            
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      
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               $ 34,000,000,000 $ 1,700,000        
Additional charge on provision for loan losses             0            
Additional recoveries on charge off of loans             0            
Complaint, damages sought by plaintiff $ 39,000,000                        
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
Southwestern third amended complaint                          
COMMITMENTS AND CONTINGENT LIABILITIES                          
Complaint, minimum damages sought by defendant $ 13,000,000                        
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                
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 | Natpay amended complaint                          
COMMITMENTS AND CONTINGENT LIABILITIES                          
Complaint, damages sought by plaintiff   $ 11,400,000                      
Maximum                          
COMMITMENTS AND CONTINGENT LIABILITIES                          
Loss contingency, estimate of possible loss             $ 54,400,000         $ 54,400,000