Securities - Trading Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt and Equity Securities, FV-NI [Line Items]
Trading securities	$ 6,649	$ 9,809
Corporate equity securities
Debt and Equity Securities, FV-NI [Line Items]
Trading securities	4,343	7,946
Mutual funds
Debt and Equity Securities, FV-NI [Line Items]
Trading securities	1,283	807
Money market
Debt and Equity Securities, FV-NI [Line Items]
Trading securities	404	350
Corporate notes and bonds
Debt and Equity Securities, FV-NI [Line Items]
Trading securities	569	655
U.S. Government sponsored entities
Debt and Equity Securities, FV-NI [Line Items]
Trading securities	$ 50	$ 51