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Securities - Unrealized Losses on Available-for-Sale of Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value |  |
Less than 12 Months | $ 38,070 | $ 31,829
12 Months or Longer | 988,694 | 1,011,691
Total | 1,026,764 | 1,043,520
Unrealized Losses |  |
Less than 12 Months | 344 | 286
12 Months or Longer | 150,519 | 140,922
Total | 150,863 | 141,208
U.S. Treasuries |  |
Fair Value |  |
Less than 12 Months | 9,942 | 0
12 Months or Longer | 65,460 | 65,663
Total | 75,402 | 65,663
Unrealized Losses |  |
Less than 12 Months | 1 | 0
12 Months or Longer | 5,243 | 5,009
Total | 5,244 | 5,009
Obligations of U.S. Government sponsored entities |  |
Fair Value |  |
Less than 12 Months | 14,384 | 14,453
12 Months or Longer | 219,684 | 220,913
Total | 234,068 | 235,366
Unrealized Losses |  |
Less than 12 Months | 188 | 110
12 Months or Longer | 23,407 | 22,167
Total | 23,595 | 22,277
Obligations of U.S. states and political subdivisions |  |
Fair Value |  |
Less than 12 Months | 1,607 | 10,572
12 Months or Longer | 78,913 | 69,601
Total | 80,520 | 80,173
Unrealized Losses |  |
Less than 12 Months | 13 | 106
12 Months or Longer | 8,749 | 7,971
Total | 8,762 | 8,077
U.S. Government agencies |  |
Fair Value |  |
Less than 12 Months | 1,137 | 1,145
12 Months or Longer | 41,049 | 43,764
Total | 42,186 | 44,909
Unrealized Losses |  |
Less than 12 Months | 8 | 4
12 Months or Longer | 5,195 | 4,740
Total | 5,203 | 4,744
U.S. Government sponsored entities |  |
Fair Value |  |
Less than 12 Months | 11,000 | 5,659
12 Months or Longer | 581,249 | 609,456
Total | 592,249 | 615,115
Unrealized Losses |  |
Less than 12 Months | 134 | 66
12 Months or Longer | 107,764 | 100,829
Total | 107,898 | 100,895
U.S. corporate debt securities |  |
Fair Value |  |
Less than 12 Months | 0 | 0
12 Months or Longer | 2,339 | 2,294
Total | 2,339 | 2,294
Unrealized Losses |  |
Less than 12 Months | 0 | 0
12 Months or Longer | 161 | 206
Total | $ 161 | $ 206

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