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BORROWINGS - Additional Information (Details)
 1 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
Sep. 30, 2025
USD ($)
agreement
Dec. 31, 2024
USD ($)
agreement
Dec. 31, 2007
USD ($)
security
Jul. 24, 2025
USD ($)
Debt Instrument [Line Items]          
Prepayments of the FHLB borrowings   $ 3,600,000,000 $ 2,100,000,000    
Remaining borrowing capacity   1,800,000,000 1,200,000,000    
Naming applicable municipalities as beneficiaries   283,600,000 157,700,000    
Loans receivable   6,468,196,000 4,608,956,000    
Maximum amount of Open Repo borrowing available   171,604,000 0   $ 437,000,000
Unamortized debt issuance costs   200,000 400,000    
Federal Home Loan Bank, Advances, Open Repo Borrowings          
Debt Instrument [Line Items]          
Federal home loan balance   $ 250,000,000 250,000,000    
Commitment term   364 days      
Maximum amount of Open Repo borrowing available   $ 121,604,000 0    
Federal Reserve Bank Advances | Federal Reserve BIC Program          
Debt Instrument [Line Items]          
Federal home loan balance   208,100,000      
Prepayments of the FHLB borrowings   62,500,000      
Loans receivable   221,800,000      
Maximum amount of Open Repo borrowing available   $ 0 $ 0    
Subordinated Debt          
Debt Instrument [Line Items]          
Number of preferred trust securities | security       2  
Floating rate trust preferred securities       $ 10,000,000  
Effective percentage   5.85% 6.17%    
Trust preferred securities, interest payment deferment period   5 years      
Subordinated Debt | Notes Maturing In June 2031          
Debt Instrument [Line Items]          
Floating rate trust preferred securities $ 85,000,000        
Interest rate, percentage 3.25%        
Proceeds from issuance of subordinated notes, net of issuance costs $ 83,500,000        
Subordinated Debt | SOFR          
Debt Instrument [Line Items]          
Line of credit, basis spread on variable rate (percent)   1.55%      
Credit spread adjustment (as percent)   0.26161%      
Subordinated Debt | SOFR | Notes Maturing In June 2031          
Debt Instrument [Line Items]          
Line of credit, basis spread on variable rate (percent)   2.58%      
Subordinated Debt | LIBOR          
Debt Instrument [Line Items]          
Line of credit, basis spread on variable rate (percent)       1.55%  
Line of Credit | Overnight Borrowing Agreements          
Debt Instrument [Line Items]          
Line of credit, outstanding amount   $ 0 $ 0    
Line of Credit | Unsecured Debt          
Debt Instrument [Line Items]          
Number of unsecured lines of credit issued | agreement   1 1    
Pledge on certain loan amount   $ 10,000,000 $ 10,000,000    
Line of credit, outstanding amount   $ 10,000,000 $ 0    
Line of Credit | Unsecured Debt | Secured Overnight Financing Rate (SOFR)          
Debt Instrument [Line Items]          
Line of credit, basis spread on variable rate (percent)   2.85%