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Securities - Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value |  |
Less than 12 Months | $ 502,484 |
Less than 12 Months |  | $ 600,696
12 Months or Longer | 777,737 |
12 Months or Longer |  | 551,925
Total | 1,280,221 |
Total |  | 1,152,621
Unrealized Losses |  |
Less than 12 Months | 11,209 |
Less than 12 Months |  | 4,913
12 Months or Longer | 39,008 |
12 Months or Longer |  | 14,571
Total | 50,217 |
Total |  | 19,484
Fair Value |  |
Less than 12 Months | 123,589 | 25,599
12 Months or Longer | 4,778 | 0
Total | 128,367 | 25,599
Unrealized Losses |  |
Less than 12 Months | 2,818 | 97
12 Months or Longer | 222 | 0
Total | 3,040 | 97
Obligations of U.S. Government sponsored entities |  |
Fair Value |  |
Less than 12 Months | 298,473 |
Less than 12 Months |  | 319,545
12 Months or Longer | 187,260 |
12 Months or Longer |  | 39,791
Total | 485,733 |
Total |  | 359,336
Unrealized Losses |  |
Less than 12 Months | 6,017 |
Less than 12 Months |  | 2,301
12 Months or Longer | 7,087 |
12 Months or Longer |  | 1,032
Total | 13,104 |
Total |  | 3,333
Fair Value |  |
Less than 12 Months | 123,589 | 20,505
12 Months or Longer | 4,778 | 0
Total | 128,367 | 20,505
Unrealized Losses |  |
Less than 12 Months | 2,818 | 90
12 Months or Longer | 222 | 0
Total | 3,040 | 90
Obligations of U.S. states and political subdivisions |  |
Fair Value |  |
Less than 12 Months | 52,521 |
Less than 12 Months |  | 39,571
12 Months or Longer | 22,773 |
12 Months or Longer |  | 11,729
Total | 75,294 |
Total |  | 51,300
Unrealized Losses |  |
Less than 12 Months | 687 |
Less than 12 Months |  | 219
12 Months or Longer | 1,101 |
12 Months or Longer |  | 202
Total | 1,788 |
Total |  | 421
U.S. Government agencies |  |
Fair Value |  |
Less than 12 Months | 9,338 |
Less than 12 Months |  | 33,056
12 Months or Longer | 93,660 |
12 Months or Longer |  | 86,562
Total | 102,998 |
Total |  | 119,618
Unrealized Losses |  |
Less than 12 Months | 284 |
Less than 12 Months |  | 452
12 Months or Longer | 5,120 |
12 Months or Longer |  | 2,219
Total | 5,404 |
Total |  | 2,671
U.S. Government sponsored entities |  |
Fair Value |  |
Less than 12 Months | 142,152 |
Less than 12 Months |  | 208,524
12 Months or Longer | 471,869 |
12 Months or Longer |  | 410,767
Total | 614,021 |
Total |  | 619,291
Unrealized Losses |  |
Less than 12 Months | 4,221 |
Less than 12 Months |  | 1,941
12 Months or Longer | 25,375 |
12 Months or Longer |  | 10,693
Total | 29,596 |
Total |  | 12,634
U.S. corporate debt securities |  |
Fair Value |  |
Less than 12 Months | 0 |
Less than 12 Months |  | 0
12 Months or Longer | 2,175 |
12 Months or Longer |  | 2,163
Total | 2,175 |
Total |  | 2,163
Unrealized Losses |  |
Less than 12 Months | 0 |
Less than 12 Months |  | 0
12 Months or Longer | 325 |
12 Months or Longer |  | 338
Total | $ 325 |
Total |  | 338
Equity securities |  |
Fair Value |  |
Less than 12 Months |  | 0
12 Months or Longer |  | 913
Total |  | 913
Unrealized Losses |  |
Less than 12 Months |  | 0
12 Months or Longer |  | 87
Total |  | 87
Obligations of U.S. states and political subdivisions |  |
Fair Value |  |
Less than 12 Months |  | 5,094
12 Months or Longer |  | 0
Total |  | 5,094
Unrealized Losses |  |
Less than 12 Months |  | 7
12 Months or Longer |  | 0
Total |  | $ 7

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