Securities - Trading Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt and Equity Securities, FV-NI [Line Items]
Trading securities	$ 9,088	$ 7,786
Corporate equity securities
Debt and Equity Securities, FV-NI [Line Items]
Trading securities	7,259	5,828
Mutual funds
Debt and Equity Securities, FV-NI [Line Items]
Trading securities	911	1,058
Certificates of deposit
Debt and Equity Securities, FV-NI [Line Items]
Trading securities	210	268
Corporate notes and bonds
Debt and Equity Securities, FV-NI [Line Items]
Trading securities	657	581
U.S. Gov’t sponsored entities
Debt and Equity Securities, FV-NI [Line Items]
Trading securities	$ 51	$ 51