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SECURITIES - Additional Information (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
USD ($)
item
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
item
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
item
Debt securities available-for-sale, at fair value $ 403,589,000   $ 403,589,000   $ 392,968,000
Aggregate carrying value 184,259,000   184,259,000   $ 182,050,000
Proceeds from sales of debt securities available-for-sale 0 $ 0 0 $ 23,230,000  
Net gains and losses on debt securities $ 0 $ 0      
Gain on debt securities     0 447,000  
Loss on debt securities     $ 0 $ 348,000  
Number of securities in loss position | item 178   178   177
Percentage decline in value 8.61%   8.61%   7.75%
Minimum percentage of equity held     10.00%   10.00%
Accrued interest receivable on debt securities     $ 2,383,000    
Marketable equity securities, at fair value $ 1,288,000   1,288,000   $ 1,482,000
Asset Pledged as Collateral          
Debt securities available-for-sale, at fair value 326,659,000   326,659,000   249,114,000
Marketable Equity Securities          
Marketable equity securities, at fair value 1,288,000   1,288,000   1,482,000
Sallie Mae Bank securities | Securities Holdings Concentration Risk | Stockholders' Equity          
Debt securities available-for-sale, at fair value $ 29,712,000   $ 29,712,000   $ 25,737,000