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INVESTMENT SECURITIES - Schedule of Investment Securities in a Continuous Unrealized Loss Position (Details) $ in Thousands | Dec. 31, 2023 USD ($) security | Dec. 31, 2022 USD ($) security
--- | --- | ---
Fair Value |  |
Less than 12 Months | $ 67,007 | $ 1,423,379
12 Months or Longer | 1,493,547 | 487,129
Total | 1,560,554 | 1,910,508
Gross Unrealized Losses |  |
Less than 12 Months | 1,101 | 172,828
12 Months or Longer | 219,453 | 124,297
Total | $ 220,554 | $ 297,125
Number of Securities | security | 865 | 1,154
U.S. Treasury |  |
Fair Value |  |
Less than 12 Months |  | $ 2,459
12 Months or Longer |  | 0
Total |  | 2,459
Gross Unrealized Losses |  |
Less than 12 Months |  | 42
12 Months or Longer |  | 0
Total |  | $ 42
Number of Securities | security |  | 5
U.S. Government-sponsored agency securities |  |
Fair Value |  |
Less than 12 Months | $ 0 | $ 48,940
12 Months or Longer | 95,307 | 53,022
Total | 95,307 | 101,962
Gross Unrealized Losses |  |
Less than 12 Months | 0 | 4,973
12 Months or Longer | 16,214 | 12,219
Total | $ 16,214 | $ 17,192
Number of Securities | security | 14 | 16
State and municipal |  |
Fair Value |  |
Less than 12 Months | $ 55,514 | $ 1,177,104
12 Months or Longer | 963,584 | 108,652
Total | 1,019,098 | 1,285,756
Gross Unrealized Losses |  |
Less than 12 Months | 1,076 | 150,096
12 Months or Longer | 115,146 | 28,630
Total | $ 116,222 | $ 178,726
Number of Securities | security | 691 | 946
U.S. Government-sponsored mortgage-backed securities |  |
Fair Value |  |
Less than 12 Months | $ 11,493 | $ 182,700
12 Months or Longer | 422,868 | 325,455
Total | 434,361 | 508,155
Gross Unrealized Losses |  |
Less than 12 Months | 25 | 16,910
12 Months or Longer | 86,965 | 83,448
Total | $ 86,990 | $ 100,358
Number of Securities | security | 150 | 177
Corporate obligations |  |
Fair Value |  |
Less than 12 Months | $ 0 | $ 12,176
12 Months or Longer | 11,788 | 0
Total | 11,788 | 12,176
Gross Unrealized Losses |  |
Less than 12 Months | 0 | 807
12 Months or Longer | 1,128 | 0
Total | $ 1,128 | $ 807
Number of Securities | security | 10 | 10

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