Investment Securities - Amortized Cost and Fair Value of Debt Securities (Details) $ in Thousands	Sep. 30, 2020 USD ($)
Amortized Cost
Due in one year or less	$ 10,744
Due after one year to five years	66,984
Due after five years to ten years	56,013
Due after ten years	10,314
Total	144,055
Fair Value
Due in one year or less	10,812
Due after one year to five years	68,131
Due after five years to ten years	60,132
Due after ten years	10,600
Total	$ 149,675