Investments in Securities - Schedule of Financial Instruments Owned and Pledged as Collateral (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Public deposits
Marketable Securities [Line Items]
Securities Owned and Pledged As Collateral Amortized Cost	$ 4,742	$ 5,674
Security Owned and Pledged as Collateral, Fair Value	5,029	5,962
Collateralized borrowing accounts
Marketable Securities [Line Items]
Securities Owned and Pledged As Collateral Amortized Cost	133,242	188,309
Security Owned and Pledged as Collateral, Fair Value	139,112	201,818
Other
Marketable Securities [Line Items]
Securities Owned and Pledged As Collateral Amortized Cost	6,257	6,413
Security Owned and Pledged as Collateral, Fair Value	6,461	6,819
Securities Pledged as Collateral
Marketable Securities [Line Items]
Securities Owned and Pledged As Collateral Amortized Cost	144,241	200,396
Security Owned and Pledged as Collateral, Fair Value	$ 150,602	$ 214,599