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Securities - Unrealized Losses on Available-for-Sale and Held-to-Maturity Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value |  |
Less than 12 Months | $ 111,648 |
12 Months or Longer | 1,109,535 |
Total | 1,221,183 |
Less than 12 Months |  | $ 600,696
12 Months or Longer |  | 551,925
Total |  | 1,152,621
Unrealized Losses |  |
Less than 12 Months | 886 |
12 Months or Longer | 31,256 |
Total | 32,142 |
Less than 12 Months |  | 4,913
12 Months or Longer |  | 14,571
Total |  | 19,484
Fair Value |  |
Less than 12 Months | 13,107 | 25,599
12 Months or Longer | 125,128 | 0
Total | 138,235 | 25,599
Unrealized Losses |  |
Less than 12 Months | 33 | 97
12 Months or Longer | 1,189 | 0
Total | 1,222 | 97
Obligations of U.S. Government sponsored entities |  |
Fair Value |  |
Less than 12 Months | 21,660 |
12 Months or Longer | 449,141 |
Total | 470,801 |
Less than 12 Months |  | 319,545
12 Months or Longer |  | 39,791
Total |  | 359,336
Unrealized Losses |  |
Less than 12 Months | 183 |
12 Months or Longer | 7,370 |
Total | 7,553 |
Less than 12 Months |  | 2,301
12 Months or Longer |  | 1,032
Total |  | 3,333
Fair Value |  |
Less than 12 Months | 4,980 | 20,505
12 Months or Longer | 125,128 | 0
Total | 130,108 | 20,505
Unrealized Losses |  |
Less than 12 Months | 9 | 90
12 Months or Longer | 1,189 | 0
Total | 1,198 | 90
Obligations of U.S. states and political subdivisions |  |
Fair Value |  |
Less than 12 Months | 11,971 |
12 Months or Longer | 49,756 |
Total | 61,727 |
Less than 12 Months |  | 39,571
12 Months or Longer |  | 11,729
Total |  | 51,300
Unrealized Losses |  |
Less than 12 Months | 19 |
12 Months or Longer | 914 |
Total | 933 |
Less than 12 Months |  | 219
12 Months or Longer |  | 202
Total |  | 421
U.S. Government agencies |  |
Fair Value |  |
Less than 12 Months | 16,854 |
12 Months or Longer | 96,247 |
Total | 113,101 |
Less than 12 Months |  | 33,056
12 Months or Longer |  | 86,562
Total |  | 119,618
Unrealized Losses |  |
Less than 12 Months | 22 |
12 Months or Longer | 3,710 |
Total | 3,732 |
Less than 12 Months |  | 452
12 Months or Longer |  | 2,219
Total |  | 2,671
U.S. Government sponsored entities |  |
Fair Value |  |
Less than 12 Months | 61,163 |
12 Months or Longer | 512,216 |
Total | 573,379 |
Less than 12 Months |  | 208,524
12 Months or Longer |  | 410,767
Total |  | 619,291
Unrealized Losses |  |
Less than 12 Months | 662 |
12 Months or Longer | 18,937 |
Total | 19,599 |
Less than 12 Months |  | 1,941
12 Months or Longer |  | 10,693
Total |  | 12,634
U.S. corporate debt securities |  |
Fair Value |  |
Less than 12 Months | 0 |
12 Months or Longer | 2,175 |
Total | 2,175 |
Less than 12 Months |  | 0
12 Months or Longer |  | 2,163
Total |  | 2,163
Unrealized Losses |  |
Less than 12 Months | 0 |
12 Months or Longer | 325 |
Total | 325 |
Less than 12 Months |  | 0
12 Months or Longer |  | 338
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. sponsored entities |  |
Fair Value |  |
Less than 12 Months | 8,127 | 5,094
12 Months or Longer | 0 | 0
Total | 8,127 | 5,094
Unrealized Losses |  |
Less than 12 Months | 24 | 7
12 Months or Longer | 0 | 0
Total | $ 24 | $ 7

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