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ALLOWANCE FOR CREDIT LOSSES - Additional Information (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
Financing Receivable Recorded Investment Past Due [Line Items]                
Accrued interest receivable $ 34,120,000   $ 34,120,000     $ 29,898,000    
Individually evaluated include Nonaccrual loans 84,100,000   84,100,000     99,800,000    
Individually evaluated non accrual loans performing modified loans 0   0          
Allowance allocated to modified loans 333,000   333,000          
Charge-offs 18,027,000 $ 47,000 20,407,000 $ 5,684,000        
Allowance for credit losses 68,642,000 $ 71,283,000 68,642,000 $ 71,283,000 $ 81,770,000 $ 72,992,000 $ 67,984,000 $ 65,888,000
Allowance for credit losses, due to specific reserves $ 15,800,000   $ 15,800,000          
Allowance for credit losses, percentage of loans 1.14%   1.14%     1.32%    
Multifamily Property [Member]                
Financing Receivable Recorded Investment Past Due [Line Items]                
Charge-offs     $ 6,700,000          
Allowance for credit losses, due to specific reserves $ 4,300,000   4,300,000          
Equipment Financing Relationship [Member]                
Financing Receivable Recorded Investment Past Due [Line Items]                
Charge-offs     13,600,000          
Loans [Member]                
Financing Receivable Recorded Investment Past Due [Line Items]                
Accrued interest receivable 30,900,000   30,900,000     $ 26,200,000    
Loans [Member] | Multifamily Property [Member]                
Financing Receivable Recorded Investment Past Due [Line Items]                
Allowance for credit losses, due to specific reserves $ 506,300,000   $ 506,300,000