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Available-For-Sale And Held-To-Maturity Securities (Schedule Of Gross Unrealized Losses And The Estimated Fair Value By Length Of Time In A Loss Position) (Details)
$ in Thousands
Sep. 30, 2020
USD ($)
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]  
Available-for-sale Securities, Gross unrealized losses, Less than 12 months $ (8,177)
Available-for-sale Securities, Estimated fair value, Less than 12 months 689,132
Available-for-sale Securities, Gross unrealized losses, 12 months or more (9,779)
Available-for-sale Securities, Estimated fair value, 12 months or more 633,043
Available-for-sale Securities, Gross unrealized losses, Total (17,956)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total 1,322,175
Mortgage Backed Securities [Member] | Agency [Member]  
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]  
Available-for-sale Securities, Gross unrealized losses, Less than 12 months (118)
Available-for-sale Securities, Estimated fair value, Less than 12 months 6,797
Available-for-sale Securities, Gross unrealized losses, 12 months or more (98)
Available-for-sale Securities, Estimated fair value, 12 months or more 10,191
Available-for-sale Securities, Gross unrealized losses, Total (216)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total 16,988
Mortgage Backed Securities [Member] | Non-Agency [Member]  
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]  
Available-for-sale Securities, Gross unrealized losses, 12 months or more (84)
Available-for-sale Securities, Estimated fair value, 12 months or more 713
Available-for-sale Securities, Gross unrealized losses, Total (84)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total 713
Corporate Fixed Income Securities [Member]  
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]  
Available-for-sale Securities, Gross unrealized losses, Less than 12 months (43)
Available-for-sale Securities, Estimated fair value, Less than 12 months 13,956
Available-for-sale Securities, Gross unrealized losses, Total (43)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total 13,956
Asset-Backed Securities [Member]  
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]  
Available-for-sale Securities, Gross unrealized losses, Less than 12 months (8,016)
Available-for-sale Securities, Estimated fair value, Less than 12 months 668,379
Available-for-sale Securities, Gross unrealized losses, 12 months or more (9,597)
Available-for-sale Securities, Estimated fair value, 12 months or more 622,139
Available-for-sale Securities, Gross unrealized losses, Total (17,613)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total $ 1,290,518