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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

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