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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, 2018 USD ($) Security | Dec. 31, 2017 USD ($) Security
--- | --- | ---
Statement [Line Items] |  |
Estimated Fair Value, Less Than 12 Months | $ 20,601 |
Unrealized Losses, Less Than 12 Months | (93) |
Estimated Fair Value, 12 Months or Longer | 0 |
Unrealized Losses, 12 Months or Longer | 0 |
Estimated Fair Value, Total | 20,601 |
Unrealized Losses, Total | $ 93 |
U.S. Government sponsored agency securities |  |
Statement [Line Items] |  |
Number of Securities, Less Than 12 Months | Security | 1 | 2
Estimated Fair Value, Less Than 12 Months | $ 4,961 |
Unrealized Losses, Less Than 12 Months | $ (31) |
Number of Securities, 12 Months or Longer | Security | 1 | 0
Estimated Fair Value, 12 Months or Longer | $ 5,770 |
Unrealized Losses, 12 Months or Longer | (108) |
Estimated Fair Value, Total | 10,731 |
Unrealized Losses, Total | $ (139) |
Estimated Fair Value, Less Than 12 Months |  | $ 5,830
Unrealized Losses, Less than 12 Months |  | (26)
Estimated Fair Value, 12 Months or Longer |  | 0
Unrealized Losses, 12 Months or Longer |  | 0
Estimated Fair Value, Total |  | 5,830
Unrealized Losses, Total |  | $ (26)
State and municipal securities |  |
Statement [Line Items] |  |
Number of Securities, Less Than 12 Months | Security | 33 | 4
Estimated Fair Value, Less Than 12 Months | $ 72,950 |
Unrealized Losses, Less Than 12 Months | $ (1,292) |
Number of Securities, 12 Months or Longer | Security | 38 | 48
Estimated Fair Value, 12 Months or Longer | $ 83,770 |
Unrealized Losses, 12 Months or Longer | (4,174) |
Estimated Fair Value, Total | 156,720 |
Unrealized Losses, Total | $ (5,466) |
Number of Securities, Less Than 12 Months | Security | 6 |
Estimated Fair Value, Less Than 12 Months | $ 20,601 |
Unrealized Losses, Less Than 12 Months | $ (93) |
Number of Securities, 12 Months or Longer | Security | 0 |
Estimated Fair Value, 12 Months or Longer | $ 0 |
Unrealized Losses, 12 Months or Longer | 0 |
Estimated Fair Value, Total | 20,601 |
Unrealized Losses, Total | $ 93 |
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 |  |
Statement [Line Items] |  |
Number of Securities, Less Than 12 Months | Security | 8 | 1
Estimated Fair Value, Less Than 12 Months | $ 24,419 |
Unrealized Losses, Less Than 12 Months | $ (227) |
Number of Securities, 12 Months or Longer | Security | 14 | 19
Estimated Fair Value, 12 Months or Longer | $ 25,642 |
Unrealized Losses, 12 Months or Longer | (3,126) |
Estimated Fair Value, Total | 50,061 |
Unrealized Losses, Total | $ (3,353) |
Estimated Fair Value, Less Than 12 Months |  | $ 4,544
Unrealized Losses, Less than 12 Months |  | (48)
Estimated Fair Value, 12 Months or Longer |  | 32,163
Unrealized Losses, 12 Months or Longer |  | (1,828)
Estimated Fair Value, Total |  | 36,707
Unrealized Losses, Total |  | $ (1,876)
Collateralized mortgage obligations |  |
Statement [Line Items] |  |
Number of Securities, Less Than 12 Months | Security | 39 | 60
Estimated Fair Value, Less Than 12 Months | $ 136,563 |
Unrealized Losses, Less Than 12 Months | $ (1,050) |
Number of Securities, 12 Months or Longer | Security | 89 | 57
Estimated Fair Value, 12 Months or Longer | $ 388,173 |
Unrealized Losses, 12 Months or Longer | (10,922) |
Estimated Fair Value, Total | 524,736 |
Unrealized Losses, Total | $ (11,972) |
Estimated Fair Value, Less Than 12 Months |  | $ 303,932
Unrealized Losses, Less than 12 Months |  | (2,408)
Estimated Fair Value, 12 Months or Longer |  | 187,690
Unrealized Losses, 12 Months or Longer |  | (7,387)
Estimated Fair Value, Total |  | 491,622
Unrealized Losses, Total |  | $ (9,795)
Residential mortgage-backed securities |  |
Statement [Line Items] |  |
Number of Securities, Less Than 12 Months | Security | 17 | 116
Estimated Fair Value, Less Than 12 Months | $ 18,220 |
Unrealized Losses, Less Than 12 Months | $ (222) |
Number of Securities, 12 Months or Longer | Security | 110 | 89
Estimated Fair Value, 12 Months or Longer | $ 402,779 |
Unrealized Losses, 12 Months or Longer | (14,990) |
Estimated Fair Value, Total | 420,999 |
Unrealized Losses, Total | $ (15,212) |
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)
Commercial mortgage-backed securities |  |
Statement [Line Items] |  |
Number of Securities, Less Than 12 Months | Security | 1 | 22
Estimated Fair Value, Less Than 12 Months | $ 9,778 |
Unrealized Losses, Less Than 12 Months | $ (35) |
Number of Securities, 12 Months or Longer | Security | 25 | 3
Estimated Fair Value, 12 Months or Longer | $ 197,326 |
Unrealized Losses, 12 Months or Longer | (3,038) |
Estimated Fair Value, Total | 207,104 |
Unrealized Losses, Total | $ (3,073) |
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 |  |
Statement [Line Items] |  |
Number of Securities, Less Than 12 Months | Security | 0 | 0
Estimated Fair Value, Less Than 12 Months | $ 0 |
Unrealized Losses, Less Than 12 Months | $ 0 |
Number of Securities, 12 Months or Longer | Security | 177 | 177
Estimated Fair Value, 12 Months or Longer | $ 102,994 |
Unrealized Losses, 12 Months or Longer | (4,416) |
Estimated Fair Value, Total | 102,994 |
Unrealized Losses, Total | $ (4,416) |
Estimated Fair Value, Less Than 12 Months |  | $ 0
Unrealized Losses, Less than 12 Months |  | 0
Estimated Fair Value, 12 Months or Longer |  | 98,668
Unrealized Losses, 12 Months or Longer |  | (8,742)
Estimated Fair Value, Total |  | 98,668
Unrealized Losses, Total |  | $ (8,742)
Debt securities |  |
Statement [Line Items] |  |
Number of Securities, Less Than 12 Months | Security | 99 | 205
Estimated Fair Value, Less Than 12 Months | $ 266,891 |
Unrealized Losses, Less Than 12 Months | $ (2,857) |
Number of Securities, 12 Months or Longer | Security | 454 | 393
Estimated Fair Value, 12 Months or Longer | $ 1,206,454 |
Unrealized Losses, 12 Months or Longer | (40,774) |
Estimated Fair Value, Total | 1,473,345 |
Unrealized Losses, Total | $ (43,631) |
Estimated Fair Value, Less Than 12 Months |  | $ 1,028,319
Unrealized Losses, Less than 12 Months |  | (8,998)
Estimated Fair Value, 12 Months or Longer |  | 958,963
Unrealized Losses, 12 Months or Longer |  | (31,827)
Estimated Fair Value, Total |  | 1,987,282
Unrealized Losses, Total |  | $ (40,825)

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