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Securities - Securities That Had Unrealized Losses (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Fair Value    
Less than 12 Months $ 513,507 $ 829,108
12 Months or Longer 320,551 150,125
Total 834,058 979,233
Unrealized Losses    
Less than 12 Months 4,770 13,945
12 Months or Longer 7,725 5,474
Total 12,495 19,419
Fair Value    
Less than 12 Months 6,080 43,369
12 Months or Longer 0 0
Total 6,080 43,369
Unrealized Losses    
Less than 12 Months 45 286
12 Months or Longer 0 0
Total 45 286
Obligations of U.S. Government sponsored entities    
Fair Value    
Less than 12 Months 130,038 208,940
12 Months or Longer 7,446 0
Total 137,484 208,940
Unrealized Losses    
Less than 12 Months 1,109 2,303
12 Months or Longer 113 0
Total 1,222 2,303
Fair Value    
Less than 12 Months 4,959 40,802
12 Months or Longer 0 0
Total 4,959 40,802
Unrealized Losses    
Less than 12 Months 41 283
12 Months or Longer 0 0
Total 41 283
Obligations of U.S. states and political subdivisions    
Fair Value    
Less than 12 Months 20,411 58,852
12 Months or Longer 12,029 751
Total 32,440 59,603
Unrealized Losses    
Less than 12 Months 185 1,139
12 Months or Longer 101 1
Total 286 1,140
Fair Value    
Less than 12 Months 1,121 2,567
12 Months or Longer 0 0
Total 1,121 2,567
Unrealized Losses    
Less than 12 Months 4 3
12 Months or Longer 0 0
Total 4 3
U.S. Government agencies    
Fair Value    
Less than 12 Months 62,581 98,307
12 Months or Longer 55,561 22,376
Total 118,142 120,683
Unrealized Losses    
Less than 12 Months 682 1,570
12 Months or Longer 1,018 702
Total 1,700 2,272
U.S. Government sponsored entities    
Fair Value    
Less than 12 Months 300,477 463,009
12 Months or Longer 242,432 123,915
Total 542,909 586,924
Unrealized Losses    
Less than 12 Months 2,794 8,933
12 Months or Longer 6,075 4,354
Total 8,869 13,287
U.S. corporate debt securities    
Fair Value    
Less than 12 Months 0 0
12 Months or Longer 2,163 2,162
Total 2,163 2,162
Unrealized Losses    
Less than 12 Months 0 0
12 Months or Longer 338 338
Total 338 338
Equity securities    
Fair Value    
Less than 12 Months 0 0
12 Months or Longer 920 921
Total 920 921
Unrealized Losses    
Less than 12 Months 0 0
12 Months or Longer 80 79
Total $ 80 $ 79