Investment Securities - Contractual maturity (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Amortized Cost
After One Year through Five Years	$ 100,000
After Five Years through Ten Years	1,657,000
After Ten Years	3,326,000
Amortized Cost	5,083,000
Fair Value
After One Year through Five Years	98,000
After Five Years through Ten Years	1,648,000
After Ten Years	3,374,000
Fair value	5,120,000
Securities pledged to secure advances from the FHLB	$ 0	$ 0