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BORROWINGS - Additional Information (Details)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
Mar. 31, 2025
USD ($)
agreement
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
agreement
Dec. 31, 2007
USD ($)
security
Debt Instrument [Line Items]          
Prepayments of the FHLB borrowings   $ 2,200,000,000   $ 2,100,000,000  
Remaining borrowing capacity   1,200,000,000   1,200,000,000  
Naming applicable municipalities as beneficiaries   159,400,000 $ 157,700,000    
Loans receivable   4,610,009,000   4,608,956,000  
Maximum amount of Open Repo borrowing available   0   0  
Unamortized debt issuance costs   400,000   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   $ 0   0  
Federal Reserve Bank Advances | Federal Reserve BIC Program          
Debt Instrument [Line Items]          
Federal home loan balance   213,800,000      
Prepayments of the FHLB borrowings   77,800,000      
Loans receivable   218,900,000      
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   6.11%   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   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   2.58%      
Subordinated Debt | LIBOR          
Debt Instrument [Line Items]          
Line of credit, basis spread on variable rate         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   $ 0   $ 0  
Line of Credit | Unsecured Debt | Secured Overnight Financing Rate (SOFR)          
Debt Instrument [Line Items]          
Line of credit, basis spread on variable rate   2.85%