Investment Securities - Amortized Cost and Fair Value by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Amortized Cost
Due in one year or less	$ 8,923
Due after one year through five years	20,335
Due after five years through ten years	42,787
Due after ten years	22,150
Total	94,195
Mortgage-backed securities	101,123
Total available-for-sale securities	195,318	$ 175,123
Fair Value
Due in one year or less	8,954
Due after one year through five years	20,462
Due after five years through ten years	43,470
Due after ten years	22,146
Total	95,032
Mortgage-backed securities	103,017
Total available-for-sale securities	$ 198,049	$ 175,093