Investment Securities - Debt Maturities (Details) - Investment securities: - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Amortized Cost
Due within one year	$ 663,812
Due after one year through five years	652,643
Due after five years through ten years	2,656,056
Due after ten years	815,743
Debt securities, available-for-sale, amortized cost	4,788,254	$ 4,769,426
Fair Value
Due within one year	654,546
Due after one year through five years	646,658
Due after five years through ten years	2,541,681
Due after ten years	804,579
Total, Fair Value	$ 4,647,464	$ 4,579,564
Weighted- Average Yield
Due within one year	0.35%
Due after one year through five years	3.91%
Due after five years through ten years	3.91%
Due after ten years	4.89%
Total, Weighted-Average Yield	3.58%