Securities (Schedule of Contractual Maturities of Debt Securities Available-for-Sale) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Abstract]
Debt securities, available-for-sale, due within one year, Amortized Cost	$ 86,113
Debt securities, available-for-sale, due after one year through five years, Amortized Cost	961,029
Debt securities, available-for-sale, due after five years through ten years, Amortized Cost	1,522,735
Debt securities, available-for-sale, due after ten years, Amortized Cost	3,328,164
Debt Securities Available-for-Sale, Amortized Cost	5,898,041	$ 4,997,529
Debt securities, available-for-sale, due within one year, Fair Value	86,855
Debt securities, available-for-sale, due after one year through five years, Fair Value	977,757
Debt securities, available-for-sale, due after five years through ten years, Fair Value	1,538,002
Debt securities, available-for-sale, due after ten years, Fair Value	3,308,385
Debt Securities Available-for-Sale, Fair Value	5,910,999	5,210,134
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	46,085
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year Five through Ten	1,256,426
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10	845,816
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Total	2,148,327	0
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	45,307
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	1,240,587
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	836,712
Debt Securities, Held-to-maturity, Fair Value, Total	$ 2,122,606	$ 0