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Securities - Schedule of Available-for-sale Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Available-for-sale securities |  |
Fair Value, Less than 12 Months | $ 33,341 | $ 31,829
Unrealized Losses, Less than 12 Months | 94 | 286
Fair Value, 12 Months or Longer | 946,219 | 1,011,691
Unrealized Losses, 12 Months or Longer | 113,399 | 140,922
Fair Value | 979,560 | 1,043,520
Unrealized Losses | 113,493 | 141,208
U.S. Treasuries |  |
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 | 67,465 | 65,663
Unrealized Losses, 12 Months or Longer | 3,305 | 5,009
Fair Value | 67,465 | 65,663
Unrealized Losses | 3,305 | 5,009
Obligations of U.S. Government sponsored entities |  |
Available-for-sale securities |  |
Fair Value, Less than 12 Months | 0 | 14,453
Unrealized Losses, Less than 12 Months | 0 | 110
Fair Value, 12 Months or Longer | 201,802 | 220,913
Unrealized Losses, 12 Months or Longer | 16,328 | 22,167
Fair Value | 201,802 | 235,366
Unrealized Losses | 16,328 | 22,277
Obligations of U.S. states and political subdivisions |  |
Available-for-sale securities |  |
Fair Value, Less than 12 Months | 0 | 10,572
Unrealized Losses, Less than 12 Months | 0 | 106
Fair Value, 12 Months or Longer | 75,370 | 69,601
Unrealized Losses, 12 Months or Longer | 7,079 | 7,971
Fair Value | 75,370 | 80,173
Unrealized Losses | 7,079 | 8,077
U.S. Government agencies |  |
Available-for-sale securities |  |
Fair Value, Less than 12 Months | 27,779 | 1,145
Unrealized Losses, Less than 12 Months | 63 | 4
Fair Value, 12 Months or Longer | 39,010 | 43,764
Unrealized Losses, 12 Months or Longer | 3,735 | 4,740
Fair Value | 66,789 | 44,909
Unrealized Losses | 3,798 | 4,744
U.S. Government sponsored entities |  |
Available-for-sale securities |  |
Fair Value, Less than 12 Months | 5,562 | 5,659
Unrealized Losses, Less than 12 Months | 31 | 66
Fair Value, 12 Months or Longer | 560,180 | 609,456
Unrealized Losses, 12 Months or Longer | 82,844 | 100,829
Fair Value | 565,742 | 615,115
Unrealized Losses | 82,875 | 100,895
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 | 2,392 | 2,294
Unrealized Losses, 12 Months or Longer | 108 | 206
Fair Value | 2,392 | 2,294
Unrealized Losses | $ 108 | $ 206

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