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Securities - Unrealized Losses on Available-for-Sale of Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 Months $ 31,829 $ 428,669
Unrealized Losses, Less than 12 Months 286 30,152
Fair Value, 12 Months or Longer 1,011,691 1,160,723
Unrealized Losses, 12 Months or Longer 140,922 206,692
Fair Value 1,043,520 1,589,392
Unrealized Losses 141,208 236,844
U.S. Treasuries    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 Months 0 28,602
Unrealized Losses, Less than 12 Months 0 2,132
Fair Value, 12 Months or Longer 65,663 138,649
Unrealized Losses, 12 Months or Longer 5,009 20,787
Fair Value 65,663 167,251
Unrealized Losses 5,009 22,919
Obligations of U.S. Government sponsored entities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 Months 14,453 143,794
Unrealized Losses, Less than 12 Months 110 7,508
Fair Value, 12 Months or Longer 220,913 457,373
Unrealized Losses, 12 Months or Longer 22,167 72,517
Fair Value 235,366 601,167
Unrealized Losses 22,277 80,025
Obligations of U.S. states and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 Months 10,572 46,638
Unrealized Losses, Less than 12 Months 106 2,385
Fair Value, 12 Months or Longer 69,601 33,435
Unrealized Losses, 12 Months or Longer 7,971 5,941
Fair Value 80,173 80,073
Unrealized Losses 8,077 8,326
U.S. Government agencies    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 Months 1,145 22,945
Unrealized Losses, Less than 12 Months 4 1,258
Fair Value, 12 Months or Longer 43,764 29,356
Unrealized Losses, 12 Months or Longer 4,740 4,813
Fair Value 44,909 52,301
Unrealized Losses 4,744 6,071
U.S. Government sponsored entities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 Months 5,659 186,690
Unrealized Losses, Less than 12 Months 66 16,869
Fair Value, 12 Months or Longer 609,456 499,532
Unrealized Losses, 12 Months or Longer 100,829 102,512
Fair Value 615,115 686,222
Unrealized Losses 100,895 119,381
U.S. corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 Months 0 0
Unrealized Losses, Less than 12 Months 0 0
Fair Value, 12 Months or Longer 2,294 2,378
Unrealized Losses, 12 Months or Longer 206 122
Fair Value 2,294 2,378
Unrealized Losses $ 206 $ 122