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SECURITIES - Additional Information (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
USD ($)
item
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
item
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
item
Debt securities available-for-sale, at fair value $ 405,081,000   $ 405,081,000   $ 392,968,000
Aggregate carrying value 217,142,000   217,142,000   $ 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 169   169   177
Percentage decline in value 5.88%   5.88%   7.75%
Minimum percentage of equity held     10.00%   10.00%
Accrued interest receivable $ 5,259,000   $ 5,259,000   $ 5,201,000
Marketable equity securities, at fair value 1,434,000   1,434,000   1,482,000
Available-for-sale Securities          
Accrued interest receivable 2,226,000   2,226,000    
Asset Pledged as Collateral          
Debt securities available-for-sale, at fair value 272,130,000   272,130,000   249,114,000
Marketable Equity Securities          
Marketable equity securities, at fair value 1,434,000   1,434,000   1,482,000
Sallie Mae Bank securities | Securities Holdings Concentration Risk | Stockholders' Equity          
Debt securities available-for-sale, at fair value $ 27,246,000   $ 27,246,000   $ 25,737,000