Derivative Instruments (Schedule Of Notional Amounts Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Derivative [Line Items]
Derivative, Notional Amount	$ 4,543,341	$ 4,631,381
Interest rate swaps
Derivative [Line Items]
Derivative, Notional Amount	1,966,263	2,065,400
Interest Rate Floor
Derivative [Line Items]
Derivative, Notional Amount	2,000,000	2,000,000
Interest rate caps
Derivative [Line Items]
Derivative, Notional Amount	58,060	37,488
Credit risk participation agreements
Derivative [Line Items]
Derivative, Notional Amount	493,988	503,196
Foreign exchange contracts
Derivative [Line Items]
Derivative, Notional Amount	14,849	16,978
Mortgage loan commitments
Derivative [Line Items]
Derivative, Notional Amount	4,705	3,060
Mortgage loan forward sale contracts
Derivative [Line Items]
Derivative, Notional Amount	476	1,759
Forward TBA contracts
Derivative [Line Items]
Derivative, Notional Amount	$ 5,000	$ 3,500