Investment Securities - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) security	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) security	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Investments, Debt and Equity Securities [Abstract]
Number of individual securities that were in a continuous unrealized loss position for less than twelve months (in securities) | security	18		18
Number of individual securities that were in a continuous unrealized loss position for greater than twelve months (in securities) | security	4		4
Gross proceeds from sales of securities	$ 32,089,000	$ 8,157,000	$ 37,252,000	$ 16,289,000
Impairment charges	0	$ 0	0	$ 0
Carrying value of investment securities pledged	124,542,000		124,542,000		$ 74,163,000
Fair value	$ 1,291,000		$ 1,291,000		$ 1,261,000