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Securities - Securities with Unrealized Losses (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Fair Value    
Less than 12 Months $ 502,484  
Less than 12 Months   $ 600,696
12 Months or Longer 777,737  
12 Months or Longer   551,925
Total 1,280,221  
Total   1,152,621
Unrealized Losses    
Less than 12 Months 11,209  
Less than 12 Months   4,913
12 Months or Longer 39,008  
12 Months or Longer   14,571
Total 50,217  
Total   19,484
Fair Value    
Less than 12 Months 123,589 25,599
12 Months or Longer 4,778 0
Total 128,367 25,599
Unrealized Losses    
Less than 12 Months 2,818 97
12 Months or Longer 222 0
Total 3,040 97
Obligations of U.S. Government sponsored entities    
Fair Value    
Less than 12 Months 298,473  
Less than 12 Months   319,545
12 Months or Longer 187,260  
12 Months or Longer   39,791
Total 485,733  
Total   359,336
Unrealized Losses    
Less than 12 Months 6,017  
Less than 12 Months   2,301
12 Months or Longer 7,087  
12 Months or Longer   1,032
Total 13,104  
Total   3,333
Fair Value    
Less than 12 Months 123,589 20,505
12 Months or Longer 4,778 0
Total 128,367 20,505
Unrealized Losses    
Less than 12 Months 2,818 90
12 Months or Longer 222 0
Total 3,040 90
Obligations of U.S. states and political subdivisions    
Fair Value    
Less than 12 Months 52,521  
Less than 12 Months   39,571
12 Months or Longer 22,773  
12 Months or Longer   11,729
Total 75,294  
Total   51,300
Unrealized Losses    
Less than 12 Months 687  
Less than 12 Months   219
12 Months or Longer 1,101  
12 Months or Longer   202
Total 1,788  
Total   421
U.S. Government agencies    
Fair Value    
Less than 12 Months 9,338  
Less than 12 Months   33,056
12 Months or Longer 93,660  
12 Months or Longer   86,562
Total 102,998  
Total   119,618
Unrealized Losses    
Less than 12 Months 284  
Less than 12 Months   452
12 Months or Longer 5,120  
12 Months or Longer   2,219
Total 5,404  
Total   2,671
U.S. Government sponsored entities    
Fair Value    
Less than 12 Months 142,152  
Less than 12 Months   208,524
12 Months or Longer 471,869  
12 Months or Longer   410,767
Total 614,021  
Total   619,291
Unrealized Losses    
Less than 12 Months 4,221  
Less than 12 Months   1,941
12 Months or Longer 25,375  
12 Months or Longer   10,693
Total 29,596  
Total   12,634
U.S. corporate debt securities    
Fair Value    
Less than 12 Months 0  
Less than 12 Months   0
12 Months or Longer 2,175  
12 Months or Longer   2,163
Total 2,175  
Total   2,163
Unrealized Losses    
Less than 12 Months 0  
Less than 12 Months   0
12 Months or Longer 325  
12 Months or Longer   338
Total $ 325  
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. states and political subdivisions    
Fair Value    
Less than 12 Months   5,094
12 Months or Longer   0
Total   5,094
Unrealized Losses    
Less than 12 Months   7
12 Months or Longer   0
Total   $ 7