Investment Securities - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) security	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) security	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Investments, Debt and Equity Securities [Abstract]
Marketable equity securities	$ 8,551,000		$ 8,551,000		$ 9,052,000
Number of available-for-sale securities in an unrealized loss position without an allowance for credit losses | security	33		33
Number of held to maturity securities in unrealized loss position without an allowance for credit losses | security	2		2
Securities pledged for deposits and borrowings	$ 59,300,000		$ 59,300,000		$ 77,900,000
Proceeds from sale of investment securities	$ 0	$ 0	$ 0	$ 0