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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) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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U.S. Government sponsored agency securities |  |
Estimated Fair Value, Less than 12 Months | $ 5,830 | $ 247,509
Unrealized Losses, Less than 12 Months | (26) | (15,676)
Estimated Fair Value, 12 Months or Longer | 0 | 0
Unrealized Losses, 12 Months or Longer | 0 | 0
Estimated Fair Value, Total | 5,830 | 247,509
Unrealized Losses, Total | (26) | (15,676)
State and municipal securities |  |
Estimated Fair Value, Less than 12 Months | 11,650 |
Unrealized Losses, Less than 12 Months | (50) |
Estimated Fair Value, 12 Months or Longer | 118,297 |
Unrealized Losses, 12 Months or Longer | (2,499) |
Estimated Fair Value, Total | 129,947 |
Unrealized Losses, Total | (2,549) |
Corporate debt securities |  |
Estimated Fair Value, Less than 12 Months | 4,544 | 11,922
Unrealized Losses, Less than 12 Months | (48) | (110)
Estimated Fair Value, 12 Months or Longer | 32,163 | 34,629
Unrealized Losses, 12 Months or Longer | (1,828) | (4,475)
Estimated Fair Value, Total | 36,707 | 46,551
Unrealized Losses, Total | (1,876) | (4,585)
Collateralized mortgage obligations |  |
Estimated Fair Value, Less than 12 Months | 303,932 | 166,905
Unrealized Losses, Less than 12 Months | (2,408) | (3,899)
Estimated Fair Value, 12 Months or Longer | 187,690 | 258,237
Unrealized Losses, 12 Months or Longer | (7,387) | (8,279)
Estimated Fair Value, Total | 491,622 | 425,142
Unrealized Losses, Total | (9,795) | (12,178)
Mortgage-backed securities |  |
Estimated Fair Value, Less than 12 Months |  | 1,137,510
Unrealized Losses, Less than 12 Months |  | (17,437)
Estimated Fair Value, 12 Months or Longer |  | 0
Unrealized Losses, 12 Months or Longer |  | 0
Estimated Fair Value, Total |  | 1,137,510
Unrealized Losses, Total |  | (17,437)
Residential mortgage-backed securities |  |
Estimated Fair Value, Less than 12 Months | 511,378 |
Unrealized Losses, Less than 12 Months | (4,348) |
Estimated Fair Value, 12 Months or Longer | 500,375 |
Unrealized Losses, 12 Months or Longer | (10,893) |
Estimated Fair Value, Total | 1,011,753 |
Unrealized Losses, Total | (15,241) |
Residential mortgage-backed securities |  |
Estimated Fair Value, Less than 12 Months | 190,985 |
Unrealized Losses, Less than 12 Months | (2,118) |
Estimated Fair Value, 12 Months or Longer | 21,770 |
Unrealized Losses, 12 Months or Longer | (478) |
Estimated Fair Value, Total | 212,755 |
Unrealized Losses, Total | (2,596) |
Auction rate securities |  |
Estimated Fair Value, Less than 12 Months | 0 | 0
Unrealized Losses, Less than 12 Months | 0 | 0
Estimated Fair Value, 12 Months or Longer | 98,668 | 97,256
Unrealized Losses, 12 Months or Longer | (8,742) | (9,959)
Estimated Fair Value, Total | 98,668 | 97,256
Unrealized Losses, Total | (8,742) | (9,959)
Debt securities |  |
Estimated Fair Value, Less than 12 Months | 1,028,319 | 1,563,846
Unrealized Losses, Less than 12 Months | (8,998) | (37,122)
Estimated Fair Value, 12 Months or Longer | 958,963 | 390,122
Unrealized Losses, 12 Months or Longer | (31,827) | (22,713)
Estimated Fair Value, Total | 1,987,282 | 1,953,968
Unrealized Losses, Total | $ (40,825) | $ (59,835)

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