Investment Securities - Maturities of Investment Securities Available-for-sale and Held-to-maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Amortized Cost
Due in One Year or Less	$ 0
Due after One Year through Five Years	4,303
Due after Five Years through Ten Years	55,267
Due after Ten Years	91,920
Total	151,490	$ 191,301
Fair Value
Due in One Year or Less	0
Due after One Year through Five Years	4,380
Due after Five Years through Ten Years	56,462
Due after Ten Years	95,825
Total	$ 156,667	$ 194,675