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INVESTMENT SECURITIES - Summary of Investment Securities in a Continuous Unrealized Loss Position (Details) $ in Thousands | Sep. 30, 2025 USD ($) security | Dec. 31, 2024 USD ($) security
--- | --- | ---
Fair Value |  |
Less than 12 Months | $ 13,985 | $ 123,122
12 Months or Longer | 1,262,927 | 1,230,622
Total | 1,276,912 | 1,353,744
Gross Unrealized Losses |  |
Less than 12 Months | 342 | 3,775
12 Months or Longer | 197,972 | 235,078
Total | $ 198,314 | $ 238,853
Number of Securities | security | 716 | 760
U.S. Government-sponsored agency securities |  |
Fair Value |  |
Less than 12 Months | $ 0 | $ 0
12 Months or Longer | 77,897 | 79,381
Total | 77,897 | 79,381
Gross Unrealized Losses |  |
Less than 12 Months | 0 | 0
12 Months or Longer | 12,407 | 16,081
Total | $ 12,407 | $ 16,081
Number of Securities | security | 12 | 12
State and municipal |  |
Fair Value |  |
Less than 12 Months | $ 8,549 | $ 40,398
12 Months or Longer | 854,844 | 820,663
Total | 863,393 | 861,061
Gross Unrealized Losses |  |
Less than 12 Months | 118 | 2,115
12 Months or Longer | 116,265 | 131,271
Total | $ 116,383 | $ 133,386
Number of Securities | security | 602 | 611
U.S. Government-sponsored mortgage-backed securities |  |
Fair Value |  |
Less than 12 Months | $ 5,436 | $ 82,724
12 Months or Longer | 321,624 | 318,310
Total | 327,060 | 401,034
Gross Unrealized Losses |  |
Less than 12 Months | 224 | 1,660
12 Months or Longer | 68,922 | 87,064
Total | $ 69,146 | $ 88,724
Number of Securities | security | 95 | 127
Corporate obligations |  |
Fair Value |  |
Less than 12 Months | $ 0 | $ 0
12 Months or Longer | 8,562 | 12,268
Total | 8,562 | 12,268
Gross Unrealized Losses |  |
Less than 12 Months | 0 | 0
12 Months or Longer | 378 | 662
Total | $ 378 | $ 662
Number of Securities | security | 7 | 10

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