Advances from Federal Home Loan Bank (FHLB) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Advances from Federal Home Loan Bank (FHLB)
FHLB advances	$ 21,581	$ 26,030
1.00% to 1.99%
Advances from Federal Home Loan Bank (FHLB)
FHLB advances	3,500	5,500
2.00% to 2.99%
Advances from Federal Home Loan Bank (FHLB)
FHLB advances	8,000	10,000
3.00% to 3.99%
Advances from Federal Home Loan Bank (FHLB)
FHLB advances	8,134	8,063
4.00% to 4.99%
Advances from Federal Home Loan Bank (FHLB)
FHLB advances		520
5.00% to 5.99%
Advances from Federal Home Loan Bank (FHLB)
FHLB advances	$ 1,947	$ 1,947