Securities - Schedule of AFS Debt Securities, By Maturity Date (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Amortized Cost
Within one year	$ 9,819
After one year but within five years	71,026
After five years but within ten years	65,419
After ten years	517,690
Amortized Cost	663,954	$ 489,445
Fair Value
Within one year	9,886
After one year but within five years	71,293
After five years but within ten years	65,956
After ten years	512,043
Fair Value	$ 659,178	$ 498,206