Investment Securities - Debt Maturities (Details) - Investment securities: - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Amortized Cost
Due within one year	$ 759,402
Due after one year through five years	753,622
Due after five years through ten years	2,151,242
Due after ten years	690,589
Debt securities, available-for-sale, amortized cost	4,354,855	$ 3,834,714
Fair Value
Due within one year	749,496
Due after one year through five years	739,884
Due after five years through ten years	2,063,410
Due after ten years	693,222
Total, Fair Value	$ 4,246,012	$ 3,836,391
Weighted- Average Yield
Due within one year	0.86%
Due after one year through five years	0.72%
Due after five years through ten years	1.54%
Due after ten years	1.35%
Total, Weighted-Average Yield	1.25%