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Securities - Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Available-for-sale securities |  |
Less than 12 Months, Fair Value |  | $ 600,696
Less than 12 Months, Unrealized Losses |  | 4,913
12 Months or Longer, Fair Value |  | 551,925
12 Months or Longer, Unrealized Losses |  | 14,571
Fair Value |  | 1,152,621
Unrealized Losses |  | 19,484
Less Than 12 Months, Fair Value | $ 749,822 |
Less than 12 Months, Unrealized Losses | 14,875 |
12 Months or Longer, Fair Value | 538,187 |
12 Months or Longer, Unrealized Losses | 22,817 |
Total Fair Value | 1,288,009 |
Total Unrealized Losses | 37,692 |
Held-to-maturity debt securities |  |
Less Than 12 Months, Fair Value | 134,473 | 25,599
Less Than 12 Months, Unrealized Losses | 1,334 | 97
12 Months or Longer, Fair Value | 0 | 0
12 Months or Longer, Unrealized Losses | 0 | 0
Total Fair Value | 134,473 | 25,599
Total Unrealized Losses | 1,334 | 97
Obligations of U.S. Government sponsored entities |  |
Available-for-sale securities |  |
Less than 12 Months, Fair Value |  | 319,545
Less than 12 Months, Unrealized Losses |  | 2,301
12 Months or Longer, Fair Value |  | 39,791
12 Months or Longer, Unrealized Losses |  | 1,032
Fair Value |  | 359,336
Unrealized Losses |  | 3,333
Less Than 12 Months, Fair Value | 409,674 |
Less than 12 Months, Unrealized Losses | 7,130 |
12 Months or Longer, Fair Value | 53,485 |
12 Months or Longer, Unrealized Losses | 1,674 |
Total Fair Value | 463,159 |
Total Unrealized Losses | 8,804 |
Held-to-maturity debt securities |  |
Less Than 12 Months, Fair Value | 130,280 | 20,505
Less Than 12 Months, Unrealized Losses | 1,327 | 90
12 Months or Longer, Fair Value | 0 | 0
12 Months or Longer, Unrealized Losses | 0 | 0
Total Fair Value | 130,280 | 20,505
Total Unrealized Losses | 1,327 | 90
Obligations of U.S. states and political subdivisions |  |
Available-for-sale securities |  |
Less than 12 Months, Fair Value |  | 39,571
Less than 12 Months, Unrealized Losses |  | 219
12 Months or Longer, Fair Value |  | 11,729
12 Months or Longer, Unrealized Losses |  | 202
Fair Value |  | 51,300
Unrealized Losses |  | 421
Less Than 12 Months, Fair Value | 55,531 |
Less than 12 Months, Unrealized Losses | 854 |
12 Months or Longer, Fair Value | 11,677 |
12 Months or Longer, Unrealized Losses | 527 |
Total Fair Value | 67,208 |
Total Unrealized Losses | 1,381 |
U.S. Government agencies |  |
Available-for-sale securities |  |
Less than 12 Months, Fair Value |  | 33,056
Less than 12 Months, Unrealized Losses |  | 452
12 Months or Longer, Fair Value |  | 86,562
12 Months or Longer, Unrealized Losses |  | 2,219
Fair Value |  | 119,618
Unrealized Losses |  | 2,671
Less Than 12 Months, Fair Value | 29,731 |
Less than 12 Months, Unrealized Losses | 892 |
12 Months or Longer, Fair Value | 83,490 |
12 Months or Longer, Unrealized Losses | 3,413 |
Total Fair Value | 113,221 |
Total Unrealized Losses | 4,305 |
U.S. Government sponsored entities |  |
Available-for-sale securities |  |
Less than 12 Months, Fair Value |  | 208,524
Less than 12 Months, Unrealized Losses |  | 1,941
12 Months or Longer, Fair Value |  | 410,767
12 Months or Longer, Unrealized Losses |  | 10,693
Fair Value |  | 619,291
Unrealized Losses |  | 12,634
Less Than 12 Months, Fair Value | 254,886 |
Less than 12 Months, Unrealized Losses | 5,999 |
12 Months or Longer, Fair Value | 387,360 |
12 Months or Longer, Unrealized Losses | 16,878 |
Total Fair Value | 642,246 |
Total Unrealized Losses | 22,877 |
U.S. corporate debt securities |  |
Available-for-sale securities |  |
Less than 12 Months, Fair Value |  | 0
Less than 12 Months, Unrealized Losses |  | 0
12 Months or Longer, Fair Value |  | 2,163
12 Months or Longer, Unrealized Losses |  | 338
Fair Value |  | 2,163
Unrealized Losses |  | 338
Less Than 12 Months, Fair Value | 0 |
Less than 12 Months, Unrealized Losses | 0 |
12 Months or Longer, Fair Value | 2,175 |
12 Months or Longer, Unrealized Losses | 325 |
Total Fair Value | 2,175 |
Total Unrealized Losses | 325 |
Equity securities |  |
Available-for-sale securities |  |
Less than 12 Months, Fair Value |  | 0
Less than 12 Months, Unrealized Losses |  | 0
12 Months or Longer, Fair Value |  | 913
12 Months or Longer, Unrealized Losses |  | 87
Fair Value |  | 913
Unrealized Losses |  | 87
Obligations of U.S. states and political subdivisions |  |
Held-to-maturity debt securities |  |
Less Than 12 Months, Fair Value | 4,193 | 5,094
Less Than 12 Months, Unrealized Losses | 7 | 7
12 Months or Longer, Fair Value | 0 | 0
12 Months or Longer, Unrealized Losses | 0 | 0
Total Fair Value | 4,193 | 5,094
Total Unrealized Losses | $ 7 | $ 7

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