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Investments - FHLB Stock (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]    
FHLB stock to be held as percentage of membership asset value 1.00%  
FHLB stock to be held as percentage of FHLB advances outstanding 2.70%  
Investment in Federal Home Loan Bank (FHLB) stock, at cost $ 476 $ 449