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Advances from Federal Home Loan Bank (FHLB) - Maturities of FHLB (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Scheduled maturities of FHLB    
2020 $ 6,197,000  
2021 3,250,000  
2023 500,000  
Thereafter 11,634,000  
FHLB advances 21,581,000 $ 26,030,000
Unused advances available with FHLB 16,300,000  
Unsecured federal funds agreement with FNBB 4,300,000  
Federal funds purchased $ 0 $ 0