Securities (Amortized Cost and Fair Value of Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Debt Securities Available for Sale, Due in one year or less, Amortized Cost	$ 31,178
Debt Securities Available for Sale, Due after one year through five years, Amortized Cost	1,263,829
Debt Securities Available for Sale, Due after five years through ten years, Amortized Cost	2,194,300
Debt Securities Available for Sale, Due after ten years, Amortized Cost	2,613,151
Securities Available for Sale, Amortized Cost	6,102,458	$ 5,774,133
Debt Securities Available for Sale, Due in one year or less, Fair Value	31,224
Debt Securities Available for Sale, Due after one year through five years, Fair Value	1,241,150
Debt Securities Available for Sale, Due after five years through ten years, Fair Value	2,038,471
Debt Securities Available for Sale, Due after ten years, Fair Value	2,325,831
Total debt securities available for sale, Fair Value	5,636,676	5,161,491
Debt Securities Held to Maturity, Due in one year or less, Amortized Cost	53,755
Debt Securities Held to Maturity, Due after one year through five years, Amortized Cost	753,558
Debt Securities Held to Maturity, Due after five years through ten years, Amortized Cost	501,491
Debt Securities Held to Maturity, Due after ten years, Amortized Cost	922,531
Securities Held to Maturity, Gross Amortized Cost	2,231,335	2,435,663
Debt Securities Held to Maturity, Due in one year or less, Fair Value	53,621
Debt Securities Held to Maturity, Due after one year through five years, Fair Value	727,480
Debt Securities Held to Maturity, Due after five years through ten years, Fair Value	475,343
Debt Securities Held to Maturity, Due after ten years, Fair Value	826,628
Total debt securities held to maturity, Fair Value	$ 2,083,072	$ 2,233,526