Derivative Instruments (Schedule Of Notional Amounts Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Derivative, Notional Amount	$ 3,742,521	$ 2,916,181
Interest Rate Swaps [Member]
Derivative [Line Items]
Derivative, Notional Amount	1,981,821	2,229,419
Interest Rate Floor [Member]
Derivative [Line Items]
Derivative, Notional Amount	1,000,000	0
Interest Rate Caps [Member]
Derivative [Line Items]
Derivative, Notional Amount	152,784	152,058
Credit Risk Participation Agreements [Member]
Derivative [Line Items]
Derivative, Notional Amount	579,925	485,633
Foreign Exchange Contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	27,991	5,119
Mortgage Loan Commitments [Member]
Derivative [Line Items]
Derivative, Notional Amount	0	21,787
Mortgage Loan Forward Sale Contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	0	1,165
Forward Contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 0	$ 21,000