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Securities - Schedule of Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Available-for-sale securities |  |
Fair Value, Less than 12 Months | $ 114,404 | $ 111,648
Unrealized Losses, Less than 12 Months | 706 | 886
Fair Value, 12 Months or Longer | 359,423 | 1,109,535
Unrealized Losses, 12 Months or Longer | 4,468 | 31,256
Fair Value | 473,827 | 1,221,183
Unrealized Losses | 5,174 | 32,142
Held-to-maturity debt securities |  |
Fair Value, Less than 12 Months |  | 13,107
Unrealized Losses, Less than 12 Months |  | 33
Fair Value, 12 Months or Longer |  | 125,128
Unrealized Losses, 12 Months or Longer |  | 1,189
Fair Value |  | 138,235
Unrealized Losses |  | 1,222
Obligations of U.S. Government sponsored entities |  |
Available-for-sale securities |  |
Fair Value, Less than 12 Months | 9,451 | 21,660
Unrealized Losses, Less than 12 Months | 49 | 183
Fair Value, 12 Months or Longer | 8,540 | 449,141
Unrealized Losses, 12 Months or Longer | 14 | 7,370
Fair Value | 17,991 | 470,801
Unrealized Losses | 63 | 7,553
Held-to-maturity debt securities |  |
Fair Value, Less than 12 Months |  | 4,980
Unrealized Losses, Less than 12 Months |  | 9
Fair Value, 12 Months or Longer |  | 125,128
Unrealized Losses, 12 Months or Longer |  | 1,189
Fair Value |  | 130,108
Unrealized Losses |  | 1,198
Obligations of U.S. states and political subdivisions |  |
Available-for-sale securities |  |
Fair Value, Less than 12 Months | 5,761 | 11,971
Unrealized Losses, Less than 12 Months | 45 | 19
Fair Value, 12 Months or Longer | 2,295 | 49,756
Unrealized Losses, 12 Months or Longer | 15 | 914
Fair Value | 8,056 | 61,727
Unrealized Losses | 60 | 933
Held-to-maturity debt securities |  |
Fair Value, Less than 12 Months |  | 8,127
Unrealized Losses, Less than 12 Months |  | 24
Fair Value, 12 Months or Longer |  | 0
Unrealized Losses, 12 Months or Longer |  | 0
Fair Value |  | 8,127
Unrealized Losses |  | 24
U.S. Government agencies |  |
Available-for-sale securities |  |
Fair Value, Less than 12 Months | 57,136 | 16,854
Unrealized Losses, Less than 12 Months | 336 | 22
Fair Value, 12 Months or Longer | 49,624 | 96,247
Unrealized Losses, 12 Months or Longer | 983 | 3,710
Fair Value | 106,760 | 113,101
Unrealized Losses | 1,319 | 3,732
U.S. Government sponsored entities |  |
Available-for-sale securities |  |
Fair Value, Less than 12 Months | 42,056 | 61,163
Unrealized Losses, Less than 12 Months | 276 | 662
Fair Value, 12 Months or Longer | 296,532 | 512,216
Unrealized Losses, 12 Months or Longer | 3,388 | 18,937
Fair Value | 338,588 | 573,379
Unrealized Losses | 3,664 | 19,599
U.S. corporate debt securities |  |
Available-for-sale securities |  |
Fair Value, Less than 12 Months | 0 | 0
Unrealized Losses, Less than 12 Months | 0 | 0
Fair Value, 12 Months or Longer | 2,432 | 2,175
Unrealized Losses, 12 Months or Longer | 68 | 325
Fair Value | 2,432 | 2,175
Unrealized Losses | $ 68 | $ 325

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