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INVESTMENT SECURITIES - Investments' Gross Unrealized Losses and Fair Value Aggregated by Investment Category and Length of Time in Continuous Unrealized Loss Position (Details) $ in Thousands | Jun. 30, 2024 USD ($) security | Dec. 31, 2023 USD ($) security
--- | --- | ---
Fair Value |  |
Less than 12 Months | $ 107,497 | $ 67,007
12 Months or Longer | 1,475,469 | 1,493,547
Total | 1,582,966 | 1,560,554
Gross Unrealized Losses |  |
Less than 12 Months | 3,803 | 1,101
12 Months or Longer | 261,920 | 219,453
Total | $ 265,723 | $ 220,554
Number of Securities | security | 910 | 865
U.S. Government-sponsored agency securities |  |
Fair Value |  |
Less than 12 Months | $ 0 | $ 0
12 Months or Longer | 91,277 | 95,307
Total | 91,277 | 95,307
Gross Unrealized Losses |  |
Less than 12 Months | 0 | 0
12 Months or Longer | 17,565 | 16,214
Total | $ 17,565 | $ 16,214
Number of Securities | security | 14 | 14
State and municipal |  |
Fair Value |  |
Less than 12 Months | $ 50,145 | $ 55,514
12 Months or Longer | 973,117 | 963,584
Total | 1,023,262 | 1,019,098
Gross Unrealized Losses |  |
Less than 12 Months | 2,900 | 1,076
12 Months or Longer | 150,582 | 115,146
Total | $ 153,482 | $ 116,222
Number of Securities | security | 725 | 691
U.S. Government-sponsored mortgage-backed securities |  |
Fair Value |  |
Less than 12 Months | $ 57,352 | $ 11,493
12 Months or Longer | 399,051 | 422,868
Total | 456,403 | 434,361
Gross Unrealized Losses |  |
Less than 12 Months | 903 | 25
12 Months or Longer | 92,874 | 86,965
Total | $ 93,777 | $ 86,990
Number of Securities | security | 161 | 150
Corporate obligations |  |
Fair Value |  |
Less than 12 Months | $ 0 | $ 0
12 Months or Longer | 12,024 | 11,788
Total | 12,024 | 11,788
Gross Unrealized Losses |  |
Less than 12 Months | 0 | 0
12 Months or Longer | 899 | 1,128
Total | $ 899 | $ 1,128
Number of Securities | security | 10 | 10

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