Investment Securities - Other information (Details)	3 Months Ended
	Mar. 31, 2022 USD ($) security	Mar. 31, 2021 USD ($) security	Dec. 31, 2021 USD ($)
Investment holdings
Number of investment securities sold	0	10
Net gain (loss) on sale of investment securities		$ 14,000
Number of securities either matured or called | security	1	3
Net gain (loss) on securities either matured or called	$ 0	$ 0
Realized loss on equity securities	89,000	$ 35,000
Secured Credit
Investment holdings
Amortized cost	4,000		$ 4,000
Fair value	4,000		5,000
Secured Credit | Asset Pledged as Collateral
Investment holdings
Amortized cost	10,700,000		11,100,000
Fair value	$ 10,300,000		$ 11,200,000