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SECURITIES - Additional Information (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2023
USD ($)
item
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
item
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
item
Debt securities available-for-sale, at fair value $ 331,580,000   $ 331,580,000   $ 373,444,000
Aggregate carrying value 195,838,000   195,838,000   241,385,000
Proceeds from sales of debt securities available-for-sale 0 $ 0 23,230,000 $ 0  
Net gains and losses on debt securities 0 $ 0      
Accrued interest receivable on debt securities     2,108,000    
Marketable equity securities, at fair value $ 1,476,000   1,476,000   $ 1,699,000
Gain on debt securities     447,000 0  
Loss on debt securities     $ 348,000 $ 0  
Number of securities in loss position | item 173   173   183
Percentage decline in value 10.13%   10.13%   9.11%
Securities Holdings Concentration Risk | Stockholders' Equity          
Number of issuers | item     1    
Asset Pledged as Collateral          
Debt securities available-for-sale, at fair value $ 247,027,000   $ 247,027,000   $ 315,836,000
Marketable Equity Securities          
Marketable equity securities, at fair value 1,476,000   1,476,000   $ 1,699,000
Sallie Mae Bank securities | Securities Holdings Concentration Risk | Stockholders' Equity          
Debt securities available-for-sale, at fair value $ 16,095,000   $ 16,095,000