Securities (Schedule of Contractual Maturities of Debt Securities Available-for-Sale) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-Sale [Abstract]
Debt securities, available-for-sale, due within one year, Amortized Cost	$ 85,094
Debt securities, available-for-sale, due after one year through five years, Amortized Cost	1,132,895
Debt securities, available-for-sale, due after five years through ten years, Amortized Cost	1,106,689
Debt securities, available-for-sale, due after ten years, Amortized Cost	2,958,168
Debt Securities Available-for-Sale, Amortized Cost	5,282,846	$ 5,898,041
Debt securities, available-for-sale, due within one year, Fair Value	84,216
Debt securities, available-for-sale, due after one year through five years, Fair Value	1,055,150
Debt securities, available-for-sale, due after five years through ten years, Fair Value	973,108
Debt securities, available-for-sale, due after ten years, Fair Value	2,476,625
Debt Securities Available-for-Sale, Fair Value	4,589,099	5,910,999
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One	0
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five	301,515
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year Five through Ten	916,571
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10	816,706
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Total	2,034,792	2,148,327
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value	0
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	265,831
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	775,931
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	681,016
Debt Securities, Held-to-maturity, Fair Value, Total	$ 1,722,778	$ 2,122,606