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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, 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 | $ (12,812)
Available-for-sale Securities, Estimated fair value, Less than 12 months | 889,969
Available-for-sale Securities, Gross unrealized losses, 12 months or more | (4,545)
Available-for-sale Securities, Estimated fair value, 12 months or more | 201,008
Available-for-sale Securities, Gross unrealized losses, Total | (17,357)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | 1,090,977
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | (17,091)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 1,025,717
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | (2,189)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 44,574
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss, Total | (19,280)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value, Total | 1,070,291
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 | (19)
Available-for-sale Securities, Estimated fair value, Less than 12 months | 3,819
Available-for-sale Securities, Gross unrealized losses, Total | (19)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | 3,819
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 | (338)
Available-for-sale Securities, Estimated fair value, Less than 12 months | 12,233
Available-for-sale Securities, Gross unrealized losses, 12 months or more | (3,072)
Available-for-sale Securities, Estimated fair value, 12 months or more | 60,206
Available-for-sale Securities, Gross unrealized losses, Total | (3,410)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | 72,439
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 | (6,826)
Available-for-sale Securities, Estimated fair value, Less than 12 months | 425,140
Available-for-sale Securities, Gross unrealized losses, Total | (6,826)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | 425,140
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 | (656)
Available-for-sale Securities, Estimated fair value, Less than 12 months | 248,043
Available-for-sale Securities, Gross unrealized losses, Total | (656)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | 248,043
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | (205)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 63,745
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | (2,173)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 43,311
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss, Total | (2,378)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value, Total | 107,056
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 | (607)
Available-for-sale Securities, Estimated fair value, Less than 12 months | 129,632
Available-for-sale Securities, Gross unrealized losses, 12 months or more | (1,351)
Available-for-sale Securities, Estimated fair value, 12 months or more | 139,111
Available-for-sale Securities, Gross unrealized losses, Total | (1,958)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | 268,743
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | (16,886)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 961,972
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | (16)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 1,263
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss, Total | (16,902)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value, Total | 963,235
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, Less than 12 months | (4,366)
Available-for-sale Securities, Estimated fair value, Less than 12 months | 71,102
Available-for-sale Securities, Gross unrealized losses, Total | (4,366)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | 71,102
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 | (122)
Available-for-sale Securities, Estimated fair value, 12 months or more | 1,691
Available-for-sale Securities, Gross unrealized losses, Total | (122)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | $ 1,691

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