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BORROWINGS (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
Mar. 31, 2023
USD ($)
agreement
Dec. 31, 2022
USD ($)
agreement
Dec. 31, 2007
security
Mar. 31, 2007
USD ($)
Debt Instrument [Line Items]          
Prepayments of the FHLB borrowings   $ 1,600,000,000 $ 1,600,000,000    
Remaining borrowing capacity   804,900,000 757,800,000    
Naming applicable municipalities as beneficiaries   153,000,000 75,500,000    
Unamortized debt issuance costs   1,000,000 $ 1,000,000    
Federal Home Loan Bank, Advances, Open Repo Borrowings          
Debt Instrument [Line Items]          
Federal home loan balance   $ 250,000,000      
Commitment term   364 days      
Subordinated Debt          
Debt Instrument [Line Items]          
Number of preferred trust securities | security       2  
Floating rate trust preferred securities         $ 10,000,000
Effective percentage   6.42% 6.32%    
Trust preferred securities, interest payment deferment period   5 years      
Subordinated Debt | LIBOR          
Debt Instrument [Line Items]          
Line of credit, basis spread on variable rate   1.55%      
Notes Maturing In June 2031 | Subordinated Debt          
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        
Notes Maturing In June 2031 | Subordinated Debt | SOFR          
Debt Instrument [Line Items]          
Line of credit, basis spread on variable rate   2.58%      
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 | SOFR          
Debt Instrument [Line Items]          
Line of credit, basis spread on variable rate   2.85%      
Line of Credit | Overnight Borrowing Agreements          
Debt Instrument [Line Items]          
Line of credit, outstanding amount   $ 0 $ 0