Investment Securities (Investment Securities, At Fair Value) (Details) - USD ($) $ in Thousands		Mar. 31, 2025	Dec. 31, 2024
Investment Securities [Abstract]
Available for sale debt securities		$ 9,264,947	$ 9,136,853
Trading debt securities		56,569	38,034
Equity securities with a readily determinable fair value		48,951	48,359
Equity Securities without Readily Determinable Fair Value, Amount		9,231	9,083
Federal Reserve Bank Stock		35,638	35,545
Federal Home Loan Bank Stock		10,114	10,120
Private equity investments		175,618	184,386
Total investment securities	[1]	9,601,068	9,462,380
Interest Receivable, Current		$ 33,300	$ 35,000

[1] (1)Accrued interest receivable totaled $33.3 million and $35.0 million at March 31, 2025 and December 31, 2024, respectively, and was included within other assets on the consolidated balance sheets.