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Investment Securities Gross Unrealized Losses and Fair Values of Investments by Category and Length of Time in a Continuous Unrealized Loss Position (Details) $ in Thousands | Dec. 31, 2015 USD ($)
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Estimated Fair Value, Less than 12 Months | $ 800,776
Unrealized Losses, Less than 12 Months | (6,400)
Estimated Fair Value, 12 Months or Longer | 662,705
Unrealized Losses, 12 Months or Longer | (31,626)
Estimated Fair Value, Total | 1,463,481
Unrealized Losses, Total | (38,026)
U.S. Government sponsored agency securities |
Estimated Fair Value, Less than 12 Months | 9,957
Unrealized Losses, Less than 12 Months | (53)
Estimated Fair Value, 12 Months or Longer | 0
Unrealized Losses, 12 Months or Longer | 0
Estimated Fair Value, Total | 9,957
Unrealized Losses, Total | (53)
Corporate debt securities |
Estimated Fair Value, Less than 12 Months | 12,892
Unrealized Losses, Less than 12 Months | (97)
Estimated Fair Value, 12 Months or Longer | 33,036
Unrealized Losses, 12 Months or Longer | (5,979)
Estimated Fair Value, Total | 45,928
Unrealized Losses, Total | (6,076)
Collateralized mortgage obligations |
Estimated Fair Value, Less than 12 Months | 166,007
Unrealized Losses, Less than 12 Months | (1,467)
Estimated Fair Value, 12 Months or Longer | 467,778
Unrealized Losses, 12 Months or Longer | (15,505)
Estimated Fair Value, Total | 633,785
Unrealized Losses, Total | (16,972)
Mortgage-backed securities |
Estimated Fair Value, Less than 12 Months | 611,920
Unrealized Losses, Less than 12 Months | (4,783)
Estimated Fair Value, 12 Months or Longer | 63,818
Unrealized Losses, 12 Months or Longer | (1,421)
Estimated Fair Value, Total | 675,738
Unrealized Losses, Total | (6,204)
Auction rate securities |
Estimated Fair Value, Less than 12 Months | 0
Unrealized Losses, Less than 12 Months | 0
Estimated Fair Value, 12 Months or Longer | 98,059
Unrealized Losses, 12 Months or Longer | (8,713)
Estimated Fair Value, Total | 98,059
Unrealized Losses, Total | (8,713)
Debt securities |
Estimated Fair Value, Less than 12 Months | 800,776
Unrealized Losses, Less than 12 Months | (6,400)
Estimated Fair Value, 12 Months or Longer | 662,691
Unrealized Losses, 12 Months or Longer | (31,618)
Estimated Fair Value, Total | 1,463,467
Unrealized Losses, Total | (38,018)
Equity securities |
Estimated Fair Value, Less than 12 Months | 0
Unrealized Losses, Less than 12 Months | 0
Estimated Fair Value, 12 Months or Longer | 14
Unrealized Losses, 12 Months or Longer | (8)
Estimated Fair Value, Total | 14
Unrealized Losses, Total | $ (8)

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