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Securities - Schedule of Available-for-sale Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Available-for-sale securities |  |
Fair Value, Less than 12 Months | $ 73,999 | $ 428,669
Unrealized Losses, Less than 12 Months | 2,495 | 30,152
Fair Value, 12 Months or Longer | 1,393,557 | 1,160,723
Unrealized Losses, 12 Months or Longer | 217,563 | 206,692
Fair Value | 1,467,556 | 1,589,392
Unrealized Losses | 220,058 | 236,844
U.S. Treasuries |  |
Available-for-sale securities |  |
Fair Value, Less than 12 Months | 0 | 28,602
Unrealized Losses, Less than 12 Months | 0 | 2,132
Fair Value, 12 Months or Longer | 168,094 | 138,649
Unrealized Losses, 12 Months or Longer | 22,181 | 20,787
Fair Value | 168,094 | 167,251
Unrealized Losses | 22,181 | 22,919
Obligations of U.S. Government sponsored entities |  |
Available-for-sale securities |  |
Fair Value, Less than 12 Months | 28,596 | 143,794
Unrealized Losses, Less than 12 Months | 758 | 7,508
Fair Value, 12 Months or Longer | 494,947 | 457,373
Unrealized Losses, 12 Months or Longer | 68,393 | 72,517
Fair Value | 523,543 | 601,167
Unrealized Losses | 69,151 | 80,025
Obligations of U.S. states and political subdivisions |  |
Available-for-sale securities |  |
Fair Value, Less than 12 Months | 26,104 | 46,638
Unrealized Losses, Less than 12 Months | 756 | 2,385
Fair Value, 12 Months or Longer | 55,842 | 33,435
Unrealized Losses, 12 Months or Longer | 7,528 | 5,941
Fair Value | 81,946 | 80,073
Unrealized Losses | 8,284 | 8,326
U.S. Government agencies |  |
Available-for-sale securities |  |
Fair Value, Less than 12 Months | 6,244 | 22,945
Unrealized Losses, Less than 12 Months | 254 | 1,258
Fair Value, 12 Months or Longer | 42,351 | 29,356
Unrealized Losses, 12 Months or Longer | 5,665 | 4,813
Fair Value | 48,595 | 52,301
Unrealized Losses | 5,919 | 6,071
U.S. Government sponsored entities |  |
Available-for-sale securities |  |
Fair Value, Less than 12 Months | 13,055 | 186,690
Unrealized Losses, Less than 12 Months | 727 | 16,869
Fair Value, 12 Months or Longer | 630,081 | 499,532
Unrealized Losses, 12 Months or Longer | 113,538 | 102,512
Fair Value | 643,136 | 686,222
Unrealized Losses | 114,265 | 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 | 2,242 | 2,378
Unrealized Losses, 12 Months or Longer | 258 | 122
Fair Value | 2,242 | 2,378
Unrealized Losses | $ 258 | $ 122

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