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Securities - Unrealized Losses on Available-for-Sale and Held-to-Maturity Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Fair Value    
Less than 12 Months $ 417,782 $ 241,757
12 Months or Longer 9,266 288,210
Total 427,048 529,967
Unrealized Losses    
Less than 12 Months 3,014 1,371
12 Months or Longer 460 3,747
Total 3,474 5,118
Obligations of U.S. Government sponsored entities    
Fair Value    
Less than 12 Months 310,711 18,654
12 Months or Longer 0 3,479
Total 310,711 22,133
Unrealized Losses    
Less than 12 Months 1,992 76
12 Months or Longer 0 8
Total 1,992 84
Obligations of U.S. states and political subdivisions    
Fair Value    
Less than 12 Months 8,868 10,456
12 Months or Longer 0 2,300
Total 8,868 12,756
Unrealized Losses    
Less than 12 Months 40 54
12 Months or Longer 0 7
Total 40 61
U.S. Government agencies    
Fair Value    
Less than 12 Months 10,560 54,846
12 Months or Longer 1,819 45,999
Total 12,379 100,845
Unrealized Losses    
Less than 12 Months 396 489
12 Months or Longer 250 1,030
Total 646 1,519
U.S. Government sponsored entities    
Fair Value    
Less than 12 Months 87,643 157,801
12 Months or Longer 5,068 233,999
Total 92,711 391,800
Unrealized Losses    
Less than 12 Months 586 752
12 Months or Longer 89 2,635
Total 675 3,387
U.S. corporate debt securities    
Fair Value    
Less than 12 Months 0 0
12 Months or Longer 2,379 2,433
Total 2,379 2,433
Unrealized Losses    
Less than 12 Months 0 0
12 Months or Longer 121 67
Total $ 121 $ 67