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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 | 12 Months Ended
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Dec. 31, 2017 USD ($)
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |
Available-for-sale Securities, Gross unrealized losses, Less than 12 months | $ (8,532)
Available-for-sale Securities, Estimated fair value, Less than 12 months | 800,808
Available-for-sale Securities, Gross unrealized losses, 12 months or more | (12,257)
Available-for-sale Securities, Estimated fair value, 12 months or more | 483,682
Available-for-sale Securities, Gross unrealized losses, Total | (20,789)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | 1,284,490
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | (809)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 115,845
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | (17,298)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 740,715
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss, Total | (18,107)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value, Total | 856,560
U.S. Government Agency 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 | (39)
Available-for-sale Securities, Estimated fair value, Less than 12 months | 4,983
Available-for-sale Securities, Gross unrealized losses, Total | (39)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | 4,983
State And Municipal 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 | (59)
Available-for-sale Securities, Estimated fair value, Less than 12 months | 2,797
Available-for-sale Securities, Gross unrealized losses, 12 months or more | (4,073)
Available-for-sale Securities, Estimated fair value, 12 months or more | 67,762
Available-for-sale Securities, Gross unrealized losses, Total | (4,132)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | 70,559
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 | (2,513)
Available-for-sale Securities, Estimated fair value, Less than 12 months | 504,591
Available-for-sale Securities, Gross unrealized losses, 12 months or more | (3,139)
Available-for-sale Securities, Estimated fair value, 12 months or more | 185,879
Available-for-sale Securities, Gross unrealized losses, Total | (5,652)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | 690,470
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | (37)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 9,965
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss, Total | (37)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value, Total | 9,965
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 | (4,897)
Available-for-sale Securities, Estimated fair value, Less than 12 months | 175,074
Available-for-sale Securities, Gross unrealized losses, Total | (4,897)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | 175,074
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | (29)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 29,399
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | (1,833)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 42,906
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss, Total | (1,862)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value, Total | 72,305
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 | (1,024)
Available-for-sale Securities, Estimated fair value, Less than 12 months | 113,363
Available-for-sale Securities, Gross unrealized losses, 12 months or more | (1,957)
Available-for-sale Securities, Estimated fair value, 12 months or more | 158,880
Available-for-sale Securities, Gross unrealized losses, Total | (2,981)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | 272,243
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | (743)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 76,481
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | (15,465)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 697,809
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss, Total | (16,208)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value, Total | 774,290
Mortgage Backed Securities [Member] | Commercial [Member] |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |
Available-for-sale Securities, Gross unrealized losses, 12 months or more | (3,088)
Available-for-sale Securities, Estimated fair value, 12 months or more | 71,161
Available-for-sale Securities, Gross unrealized losses, Total | (3,088)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | $ 71,161

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