Derivative Instruments (Schedule Of Notional Amounts Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Derivative, Notional Amount	$ 4,240,244	$ 3,742,521
Interest rate swaps
Derivative [Line Items]
Derivative, Notional Amount	1,987,051	1,981,821
Interest Rate Floor
Derivative [Line Items]
Derivative, Notional Amount	1,500,000	1,000,000
Interest rate caps
Derivative [Line Items]
Derivative, Notional Amount	152,784	152,784
Credit risk participation agreements
Derivative [Line Items]
Derivative, Notional Amount	577,922	579,925
Foreign exchange contracts
Derivative [Line Items]
Derivative, Notional Amount	15,335	27,991
Mortgage loan commitments
Derivative [Line Items]
Derivative, Notional Amount	362	0
Mortgage loan forward sale contracts
Derivative [Line Items]
Derivative, Notional Amount	3,290	0
Forward TBA contracts
Derivative [Line Items]
Derivative, Notional Amount	$ 3,500	$ 0