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Securities - Securities with Unrealized Losses (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Fair Value    
Less than 12 Months $ 737,663  
Less than 12 Months   $ 600,696
12 Months or Longer 560,069  
12 Months or Longer   551,925
Total 1,297,732  
Total   1,152,621
Unrealized Losses    
Less than 12 Months 16,895  
Less than 12 Months   4,913
12 Months or Longer 25,860  
12 Months or Longer   14,571
Total 42,755  
Total   19,484
Fair Value    
Less than 12 Months 132,459 25,599
12 Months or Longer 0 0
Total 132,459 25,599
Unrealized Losses    
Less than 12 Months 2,234 97
12 Months or Longer 0 0
Total 2,234 97
Obligations of U.S. Government sponsored entities    
Fair Value    
Less than 12 Months 434,523  
Less than 12 Months   319,545
12 Months or Longer 53,076  
12 Months or Longer   39,791
Total 487,599  
Total   359,336
Unrealized Losses    
Less than 12 Months 9,116  
Less than 12 Months   2,301
12 Months or Longer 1,825  
12 Months or Longer   1,032
Total 10,941  
Total   3,333
Fair Value    
Less than 12 Months 129,278 20,505
12 Months or Longer 0 0
Total 129,278 20,505
Unrealized Losses    
Less than 12 Months 2,230 90
12 Months or Longer 0 0
Total 2,230 90
Obligations of U.S. states and political subdivisions    
Fair Value    
Less than 12 Months 55,903  
Less than 12 Months   39,571
12 Months or Longer 11,026  
12 Months or Longer   11,729
Total 66,929  
Total   51,300
Unrealized Losses    
Less than 12 Months 852  
Less than 12 Months   219
12 Months or Longer 522  
12 Months or Longer   202
Total 1,374  
Total   421
U.S. Government agencies    
Fair Value    
Less than 12 Months 20,321  
Less than 12 Months   33,056
12 Months or Longer 87,043  
12 Months or Longer   86,562
Total 107,364  
Total   119,618
Unrealized Losses    
Less than 12 Months 749  
Less than 12 Months   452
12 Months or Longer 3,979  
12 Months or Longer   2,219
Total 4,728  
Total   2,671
U.S. Government sponsored entities    
Fair Value    
Less than 12 Months 226,916  
Less than 12 Months   208,524
12 Months or Longer 406,749  
12 Months or Longer   410,767
Total 633,665  
Total   619,291
Unrealized Losses    
Less than 12 Months 6,178  
Less than 12 Months   1,941
12 Months or Longer 19,209  
12 Months or Longer   10,693
Total 25,387  
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 3,181 5,094
12 Months or Longer 0 0
Total 3,181 5,094
Unrealized Losses    
Less than 12 Months 4 7
12 Months or Longer 0 0
Total $ 4 $ 7