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Securities - Unrealized Losses on Available-for-Sale and Held-to-Maturity Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Fair Value    
Less than 12 Months $ 111,648  
12 Months or Longer 1,109,535  
Total 1,221,183  
Less than 12 Months   $ 600,696
12 Months or Longer   551,925
Total   1,152,621
Unrealized Losses    
Less than 12 Months 886  
12 Months or Longer 31,256  
Total 32,142  
Less than 12 Months   4,913
12 Months or Longer   14,571
Total   19,484
Fair Value    
Less than 12 Months 13,107 25,599
12 Months or Longer 125,128 0
Total 138,235 25,599
Unrealized Losses    
Less than 12 Months 33 97
12 Months or Longer 1,189 0
Total 1,222 97
Obligations of U.S. Government sponsored entities    
Fair Value    
Less than 12 Months 21,660  
12 Months or Longer 449,141  
Total 470,801  
Less than 12 Months   319,545
12 Months or Longer   39,791
Total   359,336
Unrealized Losses    
Less than 12 Months 183  
12 Months or Longer 7,370  
Total 7,553  
Less than 12 Months   2,301
12 Months or Longer   1,032
Total   3,333
Fair Value    
Less than 12 Months 4,980 20,505
12 Months or Longer 125,128 0
Total 130,108 20,505
Unrealized Losses    
Less than 12 Months 9 90
12 Months or Longer 1,189 0
Total 1,198 90
Obligations of U.S. states and political subdivisions    
Fair Value    
Less than 12 Months 11,971  
12 Months or Longer 49,756  
Total 61,727  
Less than 12 Months   39,571
12 Months or Longer   11,729
Total   51,300
Unrealized Losses    
Less than 12 Months 19  
12 Months or Longer 914  
Total 933  
Less than 12 Months   219
12 Months or Longer   202
Total   421
U.S. Government agencies    
Fair Value    
Less than 12 Months 16,854  
12 Months or Longer 96,247  
Total 113,101  
Less than 12 Months   33,056
12 Months or Longer   86,562
Total   119,618
Unrealized Losses    
Less than 12 Months 22  
12 Months or Longer 3,710  
Total 3,732  
Less than 12 Months   452
12 Months or Longer   2,219
Total   2,671
U.S. Government sponsored entities    
Fair Value    
Less than 12 Months 61,163  
12 Months or Longer 512,216  
Total 573,379  
Less than 12 Months   208,524
12 Months or Longer   410,767
Total   619,291
Unrealized Losses    
Less than 12 Months 662  
12 Months or Longer 18,937  
Total 19,599  
Less than 12 Months   1,941
12 Months or Longer   10,693
Total   12,634
U.S. corporate debt securities    
Fair Value    
Less than 12 Months 0  
12 Months or Longer 2,175  
Total 2,175  
Less than 12 Months   0
12 Months or Longer   2,163
Total   2,163
Unrealized Losses    
Less than 12 Months 0  
12 Months or Longer 325  
Total 325  
Less than 12 Months   0
12 Months or Longer   338
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. sponsored entities    
Fair Value    
Less than 12 Months 8,127 5,094
12 Months or Longer 0 0
Total 8,127 5,094
Unrealized Losses    
Less than 12 Months 24 7
12 Months or Longer 0 0
Total $ 24 $ 7