Investment Securities - Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Amortized Cost
Due in one year or less	$ 625
Due after one year through five years	2,238
Due after five years through ten years	21,456
Due after ten years or more	21,707
Mortgage-backed, due in monthly installments	79,132
Amortized Cost	125,158	$ 103,334
Fair Value
Due in one year or less	626
Due after one year through five years	2,435
Due after five years through ten years	22,168
Due after ten years or more	22,736
Mortgage-backed securities, due in monthly installments	80,046
Fair Value	$ 128,011	$ 104,321