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Securities (Details 3) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Available-for-Sale Securities |  |
Less Than 12 Months, Fair Value | $ 829,108 | $ 606,155
Less Than 12 Months, Unrealized Losses | 13,945 | 6,211
12 Months or Longer, Fair Value | 150,125 | 218,918
12 Months or Longer, Unrealized Losses | 5,474 | 7,906
Total Fair Value | 979,233 | 825,073
Total Unrealized Losses | 19,419 | 14,117
Held-to-Maturity Securities |  |
Less Than 12 Months, Fair Value | 43,369 | 31,637
Less Than 12 Months, Unrealized Losses | 286 | 448
12 Months or Longer, Fair Value | 0 | 0
12 Months or Longer, Unrealized Losses | 0 | 0
Total Fair Value | 43,369 | 31,637
Total Unrealized Losses | 286 | 448
Obligations of U.S. Government sponsored entities |  |
Available-for-Sale Securities |  |
Less Than 12 Months, Fair Value | 208,940 | 183,697
Less Than 12 Months, Unrealized Losses | 2,303 | 1,618
12 Months or Longer, Fair Value | 0 | 5,844
12 Months or Longer, Unrealized Losses | 0 | 177
Total Fair Value | 208,940 | 189,541
Total Unrealized Losses | 2,303 | 1,795
Held-to-Maturity Securities |  |
Less Than 12 Months, Fair Value | 40,802 | 29,671
Less Than 12 Months, Unrealized Losses | 283 | 444
12 Months or Longer, Fair Value | 0 | 0
12 Months or Longer, Unrealized Losses | 0 | 0
Total Fair Value | 40,802 | 29,671
Total Unrealized Losses | 283 | 444
Obligations of U.S. sponsored entities |  |
Held-to-Maturity Securities |  |
Less Than 12 Months, Fair Value | 2,567 |
Less Than 12 Months, Unrealized Losses | 3 |
12 Months or Longer, Fair Value | 0 |
12 Months or Longer, Unrealized Losses | 0 |
Total Fair Value | 2,567 |
Total Unrealized Losses | 3 |
Obligations of U.S. states and political subdivisions |  |
Available-for-Sale Securities |  |
Less Than 12 Months, Fair Value | 58,852 | 25,402
Less Than 12 Months, Unrealized Losses | 1,139 | 141
12 Months or Longer, Fair Value | 751 | 3,408
12 Months or Longer, Unrealized Losses | 1 | 12
Total Fair Value | 59,603 | 28,810
Total Unrealized Losses | 1,140 | 153
Held-to-Maturity Securities |  |
Less Than 12 Months, Fair Value |  | 1,966
Less Than 12 Months, Unrealized Losses |  | 4
12 Months or Longer, Fair Value |  | 0
12 Months or Longer, Unrealized Losses |  | 0
Total Fair Value |  | 1,966
Total Unrealized Losses |  | 4
U.S. Government agencies |  |
Available-for-Sale Securities |  |
Less Than 12 Months, Fair Value | 98,307 | 32,636
Less Than 12 Months, Unrealized Losses | 1,570 | 350
12 Months or Longer, Fair Value | 22,376 | 30,244
12 Months or Longer, Unrealized Losses | 702 | 966
Total Fair Value | 120,683 | 62,880
Total Unrealized Losses | 2,272 | 1,316
U.S. Government sponsored entities |  |
Available-for-Sale Securities |  |
Less Than 12 Months, Fair Value | 463,009 | 364,420
Less Than 12 Months, Unrealized Losses | 8,933 | 4,102
12 Months or Longer, Fair Value | 123,915 | 176,325
12 Months or Longer, Unrealized Losses | 4,354 | 6,347
Total Fair Value | 586,924 | 540,745
Total Unrealized Losses | 13,287 | 10,449
U.S. corporate debt securities |  |
Available-for-Sale Securities |  |
Less Than 12 Months, Fair Value | 0 | 0
Less Than 12 Months, Unrealized Losses | 0 | 0
12 Months or Longer, Fair Value | 2,162 | 2,163
12 Months or Longer, Unrealized Losses | 338 | 338
Total Fair Value | 2,162 | 2,163
Total Unrealized Losses | 338 | 338
Equity securities |  |
Available-for-Sale Securities |  |
Less Than 12 Months, Fair Value | 0 | 0
Less Than 12 Months, Unrealized Losses | 0 | 0
12 Months or Longer, Fair Value | 921 | 934
12 Months or Longer, Unrealized Losses | 79 | 66
Total Fair Value | 921 | 934
Total Unrealized Losses | $ 79 | $ 66

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