Investment Securities - Contractual Maturities of Securities Available-for-Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Amortized Cost
Due in one year or less	$ 43,600
Due after one year through five years	667,668
Due after five years through ten years	3,547,627
Due after ten years	6,235,204
Total securities available-for-sale	10,494,099	$ 10,603,518
Fair Value
Due in one year or less	43,705
Due after one year through five years	670,477
Due after five years through ten years	3,354,275
Due after ten years	5,906,652
Total securities available-for-sale	$ 9,975,109	$ 10,694,458