Investment Securities - Amortized Cost and Fair Value by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Amortized Cost
Due in one year or less	$ 5,521
Due after one year through five years	23,271
Due after five years through ten years	29,254
Due after ten years	120,814
Total	178,860
Mortgage-backed securities	132,222
Total available-for-sale securities	311,082	$ 310,411
Fair Value
Due in one year or less	5,517
Due after one year through five years	22,653
Due after five years through ten years	28,264
Due after ten years	106,472
Total	162,906
Mortgage-backed securities	123,848
Available-for-sale debt securities, at fair value	$ 286,754	$ 310,870