Securities - Additional Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) security	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) security	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) security
Debt and Equity Securities, FV-NI [Line Items]
Tax provision related to net realized gains	$ 0	$ 460	$ 0	$ 460
Number of securities holdings | security	0		0		0
Shareholders' equity percentage (greater than)	10.00%		10.00%		10.00%
Collateral Pledged
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, trading, restricted	$ 416,319		$ 416,319		$ 453,407