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Securities - Schedule of Available-for-sale Securities with Unrealized Losses (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Available-for-sale securities    
Fair Value, Less than 12 Months $ 351,704 $ 428,669
Unrealized Losses, Less than 12 Months 3,826 30,152
Fair Value, 12 Months or Longer 1,006,563 1,160,723
Unrealized Losses, 12 Months or Longer 190,751 206,692
Fair Value 1,358,267 1,589,392
Unrealized Losses 194,577 236,844
U.S. Treasuries    
Available-for-sale securities    
Fair Value, Less than 12 Months 43,560 28,602
Unrealized Losses, Less than 12 Months 23 2,132
Fair Value, 12 Months or Longer 63,734 138,649
Unrealized Losses, 12 Months or Longer 6,903 20,787
Fair Value 107,294 167,251
Unrealized Losses 6,926 22,919
Obligations of U.S. Government sponsored entities    
Available-for-sale securities    
Fair Value, Less than 12 Months 197,508 143,794
Unrealized Losses, Less than 12 Months 1,492 7,508
Fair Value, 12 Months or Longer 232,541 457,373
Unrealized Losses, 12 Months or Longer 30,545 72,517
Fair Value 430,049 601,167
Unrealized Losses 32,037 80,025
Obligations of U.S. states and political subdivisions    
Available-for-sale securities    
Fair Value, Less than 12 Months 11,449 46,638
Unrealized Losses, Less than 12 Months 592 2,385
Fair Value, 12 Months or Longer 65,436 33,435
Unrealized Losses, 12 Months or Longer 12,327 5,941
Fair Value 76,885 80,073
Unrealized Losses 12,919 8,326
U.S. Government agencies    
Available-for-sale securities    
Fair Value, Less than 12 Months 1,436 22,945
Unrealized Losses, Less than 12 Months 48 1,258
Fair Value, 12 Months or Longer 43,963 29,356
Unrealized Losses, 12 Months or Longer 6,816 4,813
Fair Value 45,399 52,301
Unrealized Losses 6,864 6,071
U.S. Government sponsored entities    
Available-for-sale securities    
Fair Value, Less than 12 Months 97,751 186,690
Unrealized Losses, Less than 12 Months 1,671 16,869
Fair Value, 12 Months or Longer 598,559 499,532
Unrealized Losses, 12 Months or Longer 133,990 102,512
Fair Value 696,310 686,222
Unrealized Losses 135,661 119,381
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 2,330 2,378
Unrealized Losses, 12 Months or Longer 170 122
Fair Value 2,330 2,378
Unrealized Losses $ 170 $ 122