Securities Available-for-sale - Narrative (Details)	12 Months Ended
	Dec. 31, 2019 USD ($) security item	Dec. 31, 2018 USD ($) item
Investments, Debt and Equity Securities [Abstract]
Investments with unrealized losses of less than one year | item	13	14
Investments with unrealized losses of more than one year | item	10	48
Number of securities pledged and held at FHLB	7	11
Pledged securities for FHLB	$ 7,400,000	$ 13,700,000
Public deposits	10,300,000	19,900,000
Collateral requirement	4,000,000	8,400,000
Other than temporary impairment losses, investments	$ 0	$ 0