Derivative Instruments (Schedule Of Notional Amounts Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Derivative [Line Items]
Derivative, Notional Amount	$ 4,593,942	$ 4,631,381
Interest Rate Swaps [Member]
Derivative [Line Items]
Derivative, Notional Amount	1,968,679	2,065,400
Interest Rate Floor [Member]
Derivative [Line Items]
Derivative, Notional Amount	2,000,000	2,000,000
Interest Rate Caps [Member]
Derivative [Line Items]
Derivative, Notional Amount	105,770	37,488
Credit Risk Participation Agreements [Member]
Derivative [Line Items]
Derivative, Notional Amount	474,951	503,196
Foreign Exchange Contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	29,451	16,978
Mortgage Loan Commitments [Member]
Derivative [Line Items]
Derivative, Notional Amount	6,297	3,060
Mortgage Loan Forward Sale Contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	1,794	1,759
Forward Contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 7,000	$ 3,500