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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
Dec. 31, 2020
USD ($)
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]  
Available-for-sale Securities, Gross unrealized losses, 12 months or more $ (3,400)
Available-for-sale Securities, Gross unrealized losses, Total (5,600)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total 524,100
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss (2,148)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 165,265
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss (3,443)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 358,882
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss, Total (5,591)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value, Total 524,147
Asset-Backed Securities [Member]  
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]  
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss (2,132)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 155,011
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss (3,434)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 358,154
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss, Total (5,566)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value, Total 513,165
Agency Mortgage-Backed Securities [Member] | Agency Securities  
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]  
Available-for-sale Securities, Gross unrealized losses, Less than 12 months (16)
Available-for-sale Securities, Estimated fair value, Less than 12 months 10,254
Available-for-sale Securities, Gross unrealized losses, Total (16)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total 10,254
Agency 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 (9)
Available-for-sale Securities, Estimated fair value, 12 months or more 728
Available-for-sale Securities, Gross unrealized losses, Total (9)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total $ 728