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Securities (Details 2) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Available for sale investment securities with unrealized losses |  |
Fair Value, Less Than 12 Months | $ 180,874 | $ 79,328
Unrealized Losses, Less Than 12 Months | (5,733) | (679)
Fair Value, 12 Months or Longer | 134,887 | 111,378
Unrealized Losses, 12 Months or Longer | (8,486) | (2,818)
Fair Value, Total | 315,761 | 190,706
Unrealized Losses, Total | (14,219) | (3,497)
Corporate bonds |  |
Available for sale investment securities with unrealized losses |  |
Fair Value, Less Than 12 Months | 614 | 397
Unrealized Losses, Less Than 12 Months | (8) | (3)
Fair Value, 12 Months or Longer | 568 | 383
Unrealized Losses, 12 Months or Longer | (16) | (5)
Fair Value, Total | 1,182 | 780
Unrealized Losses, Total | (24) | (8)
Small Business Administration |  |
Available for sale investment securities with unrealized losses |  |
Fair Value, Less Than 12 Months | 4 | 0
Unrealized Losses, Less Than 12 Months | 0 | 0
Fair Value, 12 Months or Longer | 12,412 | 14,182
Unrealized Losses, 12 Months or Longer | (718) | (396)
Fair Value, Total | 12,416 | 14,182
Unrealized Losses, Total | (718) | (396)
U.S. Treasury and U.S. government sponsored entities |  |
Available for sale investment securities with unrealized losses |  |
Fair Value, Less Than 12 Months | 1,574 | 3,970
Unrealized Losses, Less Than 12 Months | (18) | (34)
Fair Value, 12 Months or Longer | 4,809 | 1,912
Unrealized Losses, 12 Months or Longer | (160) | (35)
Fair Value, Total | 6,383 | 5,882
Unrealized Losses, Total | (178) | (69)
State and political subdivisions |  |
Available for sale investment securities with unrealized losses |  |
Fair Value, Less Than 12 Months | 99,196 | 33,188
Unrealized Losses, Less Than 12 Months | (2,979) | (220)
Fair Value, 12 Months or Longer | 30,670 | 25,721
Unrealized Losses, 12 Months or Longer | (1,805) | (423)
Fair Value, Total | 129,866 | 58,909
Unrealized Losses, Total | (4,784) | (643)
Mortgage-backed securities - residential |  |
Available for sale investment securities with unrealized losses |  |
Fair Value, Less Than 12 Months | 74,571 | 40,072
Unrealized Losses, Less Than 12 Months | (2,625) | (400)
Fair Value, 12 Months or Longer | 72,043 | 53,760
Unrealized Losses, 12 Months or Longer | (4,693) | (1,204)
Fair Value, Total | 146,614 | 93,832
Unrealized Losses, Total | (7,318) | (1,604)
Collateralized mortgage obligations - residential |  |
Available for sale investment securities with unrealized losses |  |
Fair Value, Less Than 12 Months | 4,915 | 1,701
Unrealized Losses, Less Than 12 Months | (103) | (22)
Fair Value, 12 Months or Longer | 14,385 | 15,420
Unrealized Losses, 12 Months or Longer | (1,094) | (755)
Fair Value, Total | 19,300 | 17,121
Unrealized Losses, Total | $ (1,197) | $ (777)

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