Investments - Narrative (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2020 USD ($) security	Dec. 31, 2019 USD ($) security
Investments, Debt and Equity Securities [Abstract]
Investments with unrealized losses of less than one year | security	17	13
Investments with unrealized losses of more than one year | security	0	10
Number of securities pledged and held at FHLB | security	7	7
Pledged securities for FHLB	$ 8,900,000	$ 7,400,000
Public deposits	9,200,000	10,300,000
Collateral requirement	3,100,000	4,000,000.0
Other than temporary impairment losses, investments	$ 0	$ 0