Investment Securities (Schedule Of Unrealized Loss On Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule of Investments [Line Items]
Securities Available-for-Sale, Less than 12 months, Fair value	$ 536,390	$ 86,393
Securities Available-for-Sale, Less than 12 months, Unrealized losses	5,512	695
Securities Available-for-Sale, 12 months or longer, Fair value		4,727
Securities Available-for-Sale, 12 months or longer, Unrealized losses		33
Securities Available-for-Sale, Fair value, Total	536,390	91,120
Securities Available-for-Sale, Unrealized losses, Total	5,512	728
U.S. Government Sponsored Entities Asset-Backed Securities [Member]
Schedule of Investments [Line Items]
Securities Available-for-Sale, Less than 12 months, Fair value	296,586	86,393
Securities Available-for-Sale, Less than 12 months, Unrealized losses	4,855	695
Securities Available-for-Sale, 12 months or longer, Fair value		4,727
Securities Available-for-Sale, 12 months or longer, Unrealized losses		33
Securities Available-for-Sale, Fair value, Total	296,586	91,120
Securities Available-for-Sale, Unrealized losses, Total	4,855	$ 728
Collateralized Loan Obligations
Schedule of Investments [Line Items]
Securities Available-for-Sale, Less than 12 months, Fair value	239,804
Securities Available-for-Sale, Less than 12 months, Unrealized losses	657
Securities Available-for-Sale, Fair value, Total	239,804
Securities Available-for-Sale, Unrealized losses, Total	$ 657

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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