Derivative Instruments (Schedule Of Notional Amounts Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Derivative [Line Items]
Derivative, Notional Amount	$ 5,133,408	$ 5,194,716
Interest rate swaps
Derivative [Line Items]
Derivative, Notional Amount	2,121,244	2,166,393
Interest Rate Floor
Derivative [Line Items]
Derivative, Notional Amount	2,000,000	2,000,000
Interest rate caps
Derivative [Line Items]
Derivative, Notional Amount	336,682	336,682
Credit risk participation agreements
Derivative [Line Items]
Derivative, Notional Amount	642,197	653,887
Foreign exchange contracts
Derivative [Line Items]
Derivative, Notional Amount	25,669	30,401
Mortgage loan commitments
Derivative [Line Items]
Derivative, Notional Amount	3,616	3,004
Mortgage loan forward sale contracts
Derivative [Line Items]
Derivative, Notional Amount	0	1,349
Forward TBA contracts
Derivative [Line Items]
Derivative, Notional Amount	$ 4,000	$ 3,000