Securities - Trading Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt and Equity Securities, FV-NI [Line Items]
Trading securities	$ 6,877	$ 6,649
Corporate equity securities
Debt and Equity Securities, FV-NI [Line Items]
Trading securities	4,524	4,343
Mutual funds
Debt and Equity Securities, FV-NI [Line Items]
Trading securities	1,361	1,283
Certificates of deposit
Debt and Equity Securities, FV-NI [Line Items]
Trading securities	400	404
Corporate notes and bonds
Debt and Equity Securities, FV-NI [Line Items]
Trading securities	592	569
U.S. Gov’t sponsored entities
Debt and Equity Securities, FV-NI [Line Items]
Trading securities	$ 0	$ 50