Investment Securities - Other information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) security	Sep. 30, 2019 USD ($) security	Sep. 30, 2020 USD ($) security	Sep. 30, 2019 USD ($) security	Dec. 31, 2019 USD ($)
Investment Holdings [Line Items]
Number of securities sold | security	10	0	10	0
Net gain (loss) on sale of securities	$ 401		$ 401
Number of securities either matured or called | security	14	5	14	11
Net gain (loss) on securities either matured or called	$ 167	$ 97	$ 167	$ 97
Secured Credit | Collateral Pledged
Investment Holdings [Line Items]
Amortized cost	10,000		10,000		$ 9,100
Fair value	$ 10,400		$ 10,400		$ 9,200