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Securities - Unrealized Losses on Available-for-Sale and Held-to-Maturity Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Fair Value    
Less than 12 Months $ 241,757 $ 111,648
12 Months or Longer 288,210 1,109,535
Total 529,967 1,221,183
Unrealized Losses    
Less than 12 Months 1,371 886
12 Months or Longer 3,747 31,256
Total 5,118 32,142
Fair Value    
Less than 12 Months   13,107
12 Months or Longer   125,128
Total   138,235
Unrealized Losses    
Less than 12 Months   33
12 Months or Longer   1,189
Total   1,222
Obligations of U.S. Government sponsored entities    
Fair Value    
Less than 12 Months 18,654 21,660
12 Months or Longer 3,479 449,141
Total 22,133 470,801
Unrealized Losses    
Less than 12 Months 76 183
12 Months or Longer 8 7,370
Total 84 7,553
Fair Value    
Less than 12 Months   4,980
12 Months or Longer   125,128
Total   130,108
Unrealized Losses    
Less than 12 Months   9
12 Months or Longer   1,189
Total   1,198
Obligations of U.S. states and political subdivisions    
Fair Value    
Less than 12 Months 10,456 11,971
12 Months or Longer 2,300 49,756
Total 12,756 61,727
Unrealized Losses    
Less than 12 Months 54 19
12 Months or Longer 7 914
Total 61 933
U.S. Government agencies    
Fair Value    
Less than 12 Months 54,846 16,854
12 Months or Longer 45,999 96,247
Total 100,845 113,101
Unrealized Losses    
Less than 12 Months 489 22
12 Months or Longer 1,030 3,710
Total 1,519 3,732
U.S. Government sponsored entities    
Fair Value    
Less than 12 Months 157,801 61,163
12 Months or Longer 233,999 512,216
Total 391,800 573,379
Unrealized Losses    
Less than 12 Months 752 662
12 Months or Longer 2,635 18,937
Total 3,387 19,599
U.S. corporate debt securities    
Fair Value    
Less than 12 Months 0 0
12 Months or Longer 2,433 2,175
Total 2,433 2,175
Unrealized Losses    
Less than 12 Months 0 0
12 Months or Longer 67 325
Total $ 67 325
Obligations of U.S. sponsored entities    
Fair Value    
Less than 12 Months   8,127
12 Months or Longer   0
Total   8,127
Unrealized Losses    
Less than 12 Months   24
12 Months or Longer   0
Total   $ 24