Investment Securities (Investment Securities, At Fair Value) (Details) - USD ($) $ in Thousands		Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Investment Securities [Abstract]
Available for sale debt securities		$ 8,534,271		$ 9,684,760
Trading debt securities		45,499		28,830
Equity securities with a readily determinable fair value		47,804		5,723
Equity Securities without Readily Determinable Fair Value, Amount		65,780	$ 6,988	6,978
Federal Reserve Bank Stock		35,361		35,166
Federal Home Loan Bank Stock		10,116		10,640
Private equity investments		178,321		176,667
Total investment securities	[1]	8,917,152		9,948,764
Interest Receivable, Current		$ 26,400		$ 28,900

[1] (1)Accrued interest receivable totaled $26.4 million and $28.9 million at June 30, 2024 and December 31, 2023, respectively, and was included within other assets on the consolidated balance sheets.