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SECURITIES - Additional Information (Details)
12 Months Ended
Dec. 31, 2023
USD ($)
item
Dec. 31, 2022
USD ($)
item
Debt securities available-for-sale, at fair value $ 392,968,000 $ 373,444,000
Aggregate carrying value 182,050,000 241,385,000
Proceeds from sales of debt securities available-for-sale 23,230,000 58,675,000
Accrued interest receivable on debt securities 2,487,000  
Marketable equity securities, at fair value 1,482,000 1,699,000
Gain on debt securities 447,000 221,000
Loss on debt securities $ 348,000 $ 974,000
Number of securities in loss position | item 177 183
Percentage decline in value 7.75% 9.11%
Minimum percentage of equity held 10.00% 10.00%
Asset Pledged as Collateral    
Debt securities available-for-sale, at fair value $ 249,114,000 $ 315,836,000
Marketable Equity Securities    
Marketable equity securities, at fair value 1,482,000 1,699,000
Sallie Mae Bank securities | Securities Holdings Concentration Risk | Stockholders' Equity    
Debt securities available-for-sale, at fair value $ 25,737,000 $ 17,362,000