Investment Securities - Debt Maturities (Details) - Investment Securities - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Amortized Cost
Due within one year	$ 591,260
Due after one year through five years	858,917
Due after five years through ten years	2,625,267
Due after ten years	819,271
Available-for-sale, Amortized Cost	4,894,715	$ 4,769,426
Fair Value
Due within one year	583,923
Due after one year through five years	845,415
Due after five years through ten years	2,484,672
Due after ten years	803,609
Total, Fair Value	$ 4,717,619	$ 4,579,564
Weighted- Average Yield
Due within one year	0.52%
Due after one year through five years	4.39%
Due after five years through ten years	4.14%
Due after ten years	5.38%
Total, Weighted-Average Yield	3.95%