Securities (Amortized Cost and Fair Value of Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Debt Securities Available for Sale, Due in one year or less, Amortized Cost	$ 36,791
Debt Securities Available for Sale, Due after one year through five years, Amortized Cost	958,196
Debt Securities Available for Sale, Due after five years through ten years, Amortized Cost	2,330,532
Debt Securities Available for Sale, Due after ten years, Amortized Cost	2,448,614
Securities Available for Sale, Amortized Cost	5,774,133	$ 5,496,718
Debt Securities Available for Sale, Due in one year or less, Fair Value	36,914
Debt Securities Available for Sale, Due after one year through five years, Fair Value	924,308
Debt Securities Available for Sale, Due after five years through ten years, Fair Value	2,099,062
Debt Securities Available for Sale, Due after ten years, Fair Value	2,101,207
Total available for sale debt securities, Fair Value	5,161,491	4,915,195
Debt Securities Held to Maturity, Due in one year or less, Amortized Cost	105,692
Debt Securities Held to Maturity, Due after one year through five years, Amortized Cost	780,633
Debt Securities Held to Maturity, Due after five years through ten years, Amortized Cost	572,371
Debt Securities Held to Maturity, Due after ten years, Amortized Cost	976,967
Securities Held to Maturity, Gross Amortized Cost	2,435,663	2,684,779
Debt Securities Held to Maturity, Due in one year or less, Fair Value	105,035
Debt Securities Held to Maturity, Due after one year through five years, Fair Value	740,241
Debt Securities Held to Maturity, Due after five years through ten years, Fair Value	535,864
Debt Securities Held to Maturity, Due after ten years, Fair Value	852,386
Total held to maturity debt securities, Fair Value	$ 2,233,526	$ 2,485,918