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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 | Sep. 30, 2024 USD ($) security | Dec. 31, 2023 USD ($) security
--- | --- | ---
Fair Value |  |
Less than 12 Months | $ 59,052 | $ 67,007
12 Months or Longer | 1,378,921 | 1,493,547
Total | 1,437,973 | 1,560,554
Gross Unrealized Losses |  |
Less than 12 Months | 1,412 | 1,101
12 Months or Longer | 190,313 | 219,453
Total | $ 191,725 | $ 220,554
Number of Securities | security | 793 | 865
U.S. Government-sponsored agency securities |  |
Fair Value |  |
Less than 12 Months | $ 0 | $ 0
12 Months or Longer | 85,033 | 95,307
Total | 85,033 | 95,307
Gross Unrealized Losses |  |
Less than 12 Months | 0 | 0
12 Months or Longer | 12,637 | 16,214
Total | $ 12,637 | $ 16,214
Number of Securities | security | 13 | 14
State and municipal |  |
Fair Value |  |
Less than 12 Months | $ 40,136 | $ 55,514
12 Months or Longer | 934,947 | 963,584
Total | 975,083 | 1,019,098
Gross Unrealized Losses |  |
Less than 12 Months | 1,335 | 1,076
12 Months or Longer | 105,602 | 115,146
Total | $ 106,937 | $ 116,222
Number of Securities | security | 662 | 691
U.S. Government-sponsored mortgage-backed securities |  |
Fair Value |  |
Less than 12 Months | $ 18,916 | $ 11,493
12 Months or Longer | 346,666 | 422,868
Total | 365,582 | 434,361
Gross Unrealized Losses |  |
Less than 12 Months | 77 | 25
12 Months or Longer | 71,423 | 86,965
Total | $ 71,500 | $ 86,990
Number of Securities | security | 108 | 150
Corporate obligations |  |
Fair Value |  |
Less than 12 Months | $ 0 | $ 0
12 Months or Longer | 12,275 | 11,788
Total | 12,275 | 11,788
Gross Unrealized Losses |  |
Less than 12 Months | 0 | 0
12 Months or Longer | 651 | 1,128
Total | $ 651 | $ 1,128
Number of Securities | security | 10 | 10

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