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Securities - Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value |  |
Less than 12 Months | $ 737,663 |
Less than 12 Months |  | $ 600,696
12 Months or Longer | 560,069 |
12 Months or Longer |  | 551,925
Total | 1,297,732 |
Total |  | 1,152,621
Unrealized Losses |  |
Less than 12 Months | 16,895 |
Less than 12 Months |  | 4,913
12 Months or Longer | 25,860 |
12 Months or Longer |  | 14,571
Total | 42,755 |
Total |  | 19,484
Fair Value |  |
Less than 12 Months | 132,459 | 25,599
12 Months or Longer | 0 | 0
Total | 132,459 | 25,599
Unrealized Losses |  |
Less than 12 Months | 2,234 | 97
12 Months or Longer | 0 | 0
Total | 2,234 | 97
Obligations of U.S. Government sponsored entities |  |
Fair Value |  |
Less than 12 Months | 434,523 |
Less than 12 Months |  | 319,545
12 Months or Longer | 53,076 |
12 Months or Longer |  | 39,791
Total | 487,599 |
Total |  | 359,336
Unrealized Losses |  |
Less than 12 Months | 9,116 |
Less than 12 Months |  | 2,301
12 Months or Longer | 1,825 |
12 Months or Longer |  | 1,032
Total | 10,941 |
Total |  | 3,333
Fair Value |  |
Less than 12 Months | 129,278 | 20,505
12 Months or Longer | 0 | 0
Total | 129,278 | 20,505
Unrealized Losses |  |
Less than 12 Months | 2,230 | 90
12 Months or Longer | 0 | 0
Total | 2,230 | 90
Obligations of U.S. states and political subdivisions |  |
Fair Value |  |
Less than 12 Months | 55,903 |
Less than 12 Months |  | 39,571
12 Months or Longer | 11,026 |
12 Months or Longer |  | 11,729
Total | 66,929 |
Total |  | 51,300
Unrealized Losses |  |
Less than 12 Months | 852 |
Less than 12 Months |  | 219
12 Months or Longer | 522 |
12 Months or Longer |  | 202
Total | 1,374 |
Total |  | 421
U.S. Government agencies |  |
Fair Value |  |
Less than 12 Months | 20,321 |
Less than 12 Months |  | 33,056
12 Months or Longer | 87,043 |
12 Months or Longer |  | 86,562
Total | 107,364 |
Total |  | 119,618
Unrealized Losses |  |
Less than 12 Months | 749 |
Less than 12 Months |  | 452
12 Months or Longer | 3,979 |
12 Months or Longer |  | 2,219
Total | 4,728 |
Total |  | 2,671
U.S. Government sponsored entities |  |
Fair Value |  |
Less than 12 Months | 226,916 |
Less than 12 Months |  | 208,524
12 Months or Longer | 406,749 |
12 Months or Longer |  | 410,767
Total | 633,665 |
Total |  | 619,291
Unrealized Losses |  |
Less than 12 Months | 6,178 |
Less than 12 Months |  | 1,941
12 Months or Longer | 19,209 |
12 Months or Longer |  | 10,693
Total | 25,387 |
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 | 3,181 | 5,094
12 Months or Longer | 0 | 0
Total | 3,181 | 5,094
Unrealized Losses |  |
Less than 12 Months | 4 | 7
12 Months or Longer | 0 | 0
Total | $ 4 | $ 7

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