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INVESTMENT SECURITIES - Additional Information (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
USD ($)
security
Jun. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
Jun. 30, 2023
USD ($)
security
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
security
Debt Securities, Available-for-sale [Line Items]            
Gross unrealized loss $ 61,360     $ 61,360   $ 66,181
Accrued interest receivable on loans receivable $ 10,400     $ 10,400   $ 9,200
Securities available for sale portfolio | security 86     86   77
Available for sale securities in unrealized loss position | security 85     85   76
Credit losses on available for sale securities   $ 0     $ 0  
Credit losses on held to maturity securities   $ 0     $ 0  
Investment Grade            
Debt Securities, Available-for-sale [Line Items]            
Available for sale securities in unrealized loss position | security 82     82    
Corporate debt securities            
Debt Securities, Available-for-sale [Line Items]            
Credit losses on available for sale securities $ 1,000     $ 1,000    
Number of corporate debt securities | security 3     3    
Certain Longer Duration Fixed-Rate Mortgage Backed Securities and Municipal Securities            
Debt Securities, Available-for-sale [Line Items]            
Amortized cost basis, transferred from the available-for-sale portfolio to the held-to-maturity portfolio     $ 346,000      
Available-for-sale securities, accumulated gross unrealized loss, before tax     $ 16,600      
Gross unrealized loss $ 15,300     $ 15,300    
Collateral Pledged | FRB Discount Window            
Debt Securities, Available-for-sale [Line Items]            
Securities pledged $ 535,100     $ 535,100   $ 356,500