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Securities - Schedule of Securities with Unrealized Losses (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Available-for-sale securities    
Fair Value, Less than 12 Months $ 477,272 $ 241,757
Unrealized Losses, Less than 12 Months 2,522 1,371
Fair Value, 12 Months or Longer 10,856 288,210
Unrealized Losses, 12 Months or Longer 454 3,747
Fair Value 488,128 529,967
Unrealized Losses 2,976 5,118
Obligations of U.S. Government sponsored entities    
Available-for-sale securities    
Fair Value, Less than 12 Months 303,834 18,654
Unrealized Losses, Less than 12 Months 817 76
Fair Value, 12 Months or Longer 0 3,479
Unrealized Losses, 12 Months or Longer 0 8
Fair Value 303,834 22,133
Unrealized Losses 817 84
Obligations of U.S. states and political subdivisions    
Available-for-sale securities    
Fair Value, Less than 12 Months 15,328 10,456
Unrealized Losses, Less than 12 Months 175 54
Fair Value, 12 Months or Longer 0 2,300
Unrealized Losses, 12 Months or Longer 0 7
Fair Value 15,328 12,756
Unrealized Losses 175 61
U.S. Government agencies    
Available-for-sale securities    
Fair Value, Less than 12 Months 46,990 54,846
Unrealized Losses, Less than 12 Months 736 489
Fair Value, 12 Months or Longer 2,978 45,999
Unrealized Losses, 12 Months or Longer 251 1,030
Fair Value 49,968 100,845
Unrealized Losses 987 1,519
U.S. Government sponsored entities    
Available-for-sale securities    
Fair Value, Less than 12 Months 111,120 157,801
Unrealized Losses, Less than 12 Months 794 752
Fair Value, 12 Months or Longer 5,512 233,999
Unrealized Losses, 12 Months or Longer 69 2,635
Fair Value 116,632 391,800
Unrealized Losses 863 3,387
U.S. corporate debt securities    
Available-for-sale securities    
Fair Value, Less than 12 Months 0 0
Unrealized Losses, Less than 12 Months 0 0
Fair Value, 12 Months or Longer 2,366 2,433
Unrealized Losses, 12 Months or Longer 134 67
Fair Value 2,366 2,433
Unrealized Losses $ 134 $ 67