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Securities - Schedule of Available-for-sale Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Available-for-sale securities |  |
Fair Value, Less than 12 Months | $ 567,682 | $ 1,095,830
Unrealized Losses, Less than 12 Months | 56,884 | 20,921
Fair Value, 12 Months or Longer | 1,172,857 | 394,300
Unrealized Losses, 12 Months or Longer | 212,290 | 11,982
Fair Value | 1,740,539 | 1,490,130
Unrealized Losses | 269,174 | 32,903
U.S. Treasuries |  |
Available-for-sale securities |  |
Fair Value, Less than 12 Months | 46,222 | 147,810
Unrealized Losses, Less than 12 Months | 5,380 | 2,542
Fair Value, 12 Months or Longer | 120,382 | 0
Unrealized Losses, 12 Months or Longer | 19,124 | 0
Fair Value | 166,604 | 147,810
Unrealized Losses | 24,504 | 2,542
Obligations of U.S. Government sponsored entities |  |
Available-for-sale securities |  |
Fair Value, Less than 12 Months | 182,146 | 362,895
Unrealized Losses, Less than 12 Months | 13,817 | 6,694
Fair Value, 12 Months or Longer | 547,882 | 289,210
Unrealized Losses, 12 Months or Longer | 84,468 | 8,678
Fair Value | 730,028 | 652,105
Unrealized Losses | 98,285 | 15,372
Obligations of U.S. states and political subdivisions |  |
Available-for-sale securities |  |
Fair Value, Less than 12 Months | 74,961 | 9,700
Unrealized Losses, Less than 12 Months | 9,682 | 85
Fair Value, 12 Months or Longer | 8,075 | 1,283
Unrealized Losses, 12 Months or Longer | 2,419 | 15
Fair Value | 83,036 | 10,983
Unrealized Losses | 12,101 | 100
U.S. Government agencies |  |
Available-for-sale securities |  |
Fair Value, Less than 12 Months | 30,615 | 22,074
Unrealized Losses, Less than 12 Months | 2,076 | 160
Fair Value, 12 Months or Longer | 24,071 | 16,846
Unrealized Losses, 12 Months or Longer | 4,427 | 372
Fair Value | 54,686 | 38,920
Unrealized Losses | 6,503 | 532
U.S. Government sponsored entities |  |
Available-for-sale securities |  |
Fair Value, Less than 12 Months | 233,738 | 553,351
Unrealized Losses, Less than 12 Months | 25,929 | 11,440
Fair Value, 12 Months or Longer | 470,077 | 84,537
Unrealized Losses, 12 Months or Longer | 101,722 | 2,841
Fair Value | 703,815 | 637,888
Unrealized Losses | 127,651 | 14,281
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 | 2,370 | 2,424
Unrealized Losses, 12 Months or Longer | 130 | 76
Fair Value | 2,370 | 2,424
Unrealized Losses | $ 130 | $ 76

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