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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 | 3 Months Ended
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Mar. 31, 2018 USD ($)
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |
Available-for-sale Securities, Gross unrealized losses, Less than 12 months | $ (20,610)
Available-for-sale Securities, Estimated fair value, Less than 12 months | 1,087,259
Available-for-sale Securities, Gross unrealized losses, 12 months or more | (17,931)
Available-for-sale Securities, Estimated fair value, 12 months or more | 477,651
Available-for-sale Securities, Gross unrealized losses, Total | (38,541)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | 1,564,910
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | (3,399)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 474,593
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | (30,505)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 698,117
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss, Total | (33,904)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value, Total | 1,172,710
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 | (56)
Available-for-sale Securities, Estimated fair value, Less than 12 months | 5,026
Available-for-sale Securities, Gross unrealized losses, Total | (56)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | 5,026
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 | (120)
Available-for-sale Securities, Estimated fair value, Less than 12 months | 2,732
Available-for-sale Securities, Gross unrealized losses, 12 months or more | (4,142)
Available-for-sale Securities, Estimated fair value, 12 months or more | 67,133
Available-for-sale Securities, Gross unrealized losses, Total | (4,262)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | 69,865
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 | (16,980)
Available-for-sale Securities, Estimated fair value, Less than 12 months | 885,475
Available-for-sale Securities, Gross unrealized losses, 12 months or more | (6,326)
Available-for-sale Securities, Estimated fair value, 12 months or more | 182,272
Available-for-sale Securities, Gross unrealized losses, Total | (23,306)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | 1,067,747
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 | (1,147)
Available-for-sale Securities, Estimated fair value, Less than 12 months | 91,881
Available-for-sale Securities, Gross unrealized losses, Total | (1,147)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | 91,881
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | (451)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 181,393
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | (2,347)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 42,425
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss, Total | (2,798)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value, Total | 223,818
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 | (2,307)
Available-for-sale Securities, Estimated fair value, Less than 12 months | 102,145
Available-for-sale Securities, Gross unrealized losses, 12 months or more | (2,637)
Available-for-sale Securities, Estimated fair value, 12 months or more | 159,001
Available-for-sale Securities, Gross unrealized losses, Total | (4,944)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | 261,146
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | (2,948)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 293,200
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | (28,158)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 655,692
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss, Total | (31,106)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value, Total | 948,892
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 | (4,826)
Available-for-sale Securities, Estimated fair value, 12 months or more | 69,245
Available-for-sale Securities, Gross unrealized losses, Total | (4,826)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | $ 69,245

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