Investment Securities (Investment Securities Pledged To Secure Borrowings And Public Deposits) (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Investments, Debt and Equity Securities [Abstract]
To state and local governments to secure public deposits	$ 1,796,582
To secure repurchase agreements	386,989
Other securities pledged	1,863,025
Financial Instruments, Owned, at Amortized Cost	4,046,596
To state and local governments to secure public deposits, fair value	1,657,160
To secure repurchase agreements, fair value	358,162
Other securities pledged, fair value	1,766,958
Total pledged securities, fair value	$ 3,782,280