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INVESTMENT SECURITIES (Narrative) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]      
Money market investments $ 4,073 $ 4,988 $ 4,161
Restricted cash 0 164 157
Securitized GNMA pools retained, amortized cost $ 52,800 $ 80,400  
Securitized GNMA pool retained, yield 5.20% 3.53%  
Retained FNMA pools $ 17,200 $ 0  
FNMA pools retained, yield 5.37%    
Proceeds from sale of available for sale securities   0  
Investment securities | US Treasury securities      
Debt Securities, Available-for-sale [Line Items]      
Available for sale, purchase price $ 1,500 $ 411,000  
Proceeds from sale of available for sale securities 203,300    
Loss on available for sale securities 1,100    
OIB      
Debt Securities, Available-for-sale [Line Items]      
Restricted cash 325   325
Oriental Overseas      
Debt Securities, Available-for-sale [Line Items]      
Restricted cash 325   325
Asset Pledged as Collateral      
Debt Securities, Available-for-sale [Line Items]      
Pledged assets 671,800   294,200
Asset Pledged as Collateral | Public Funds      
Debt Securities, Available-for-sale [Line Items]      
Pledged assets $ 462,900   $ 293,700