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Derivative Instruments (Schedule Of Mortgage Banking Derivatives) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Interest Rate Commitments [Member]    
Derivatives, Fair Value [Line Items]    
Notional Amount, Assets $ 923,043 $ 297,454
Fair value, Derivative assets 21,703 3,104
TBA Mortgage-Back Securities [Member]    
Derivatives, Fair Value [Line Items]    
Notional Amount, Assets 675,000 225,500
Fair Value, Derivative $ (2,070) $ (350)