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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 | Mar. 31, 2025 USD ($) security | Dec. 31, 2024 USD ($) security
--- | --- | ---
Fair Value |  |
Less than 12 Months | $ 70,221 | $ 123,122
12 Months or Longer | 1,242,023 | 1,230,622
Total | 1,312,244 | 1,353,744
Gross Unrealized Losses |  |
Less than 12 Months | 1,566 | 3,775
12 Months or Longer | 239,980 | 235,078
Total | $ 241,546 | $ 238,853
Number of Securities | security | 747 | 760
U.S. Government-sponsored agency securities |  |
Fair Value |  |
Less than 12 Months | $ 0 | $ 0
12 Months or Longer | 79,926 | 79,381
Total | 79,926 | 79,381
Gross Unrealized Losses |  |
Less than 12 Months | 0 | 0
12 Months or Longer | 13,832 | 16,081
Total | $ 13,832 | $ 16,081
Number of Securities | security | 12 | 12
State and municipal |  |
Fair Value |  |
Less than 12 Months | $ 14,702 | $ 40,398
12 Months or Longer | 828,805 | 820,663
Total | 843,507 | 861,061
Gross Unrealized Losses |  |
Less than 12 Months | 921 | 2,115
12 Months or Longer | 148,649 | 131,271
Total | $ 149,570 | $ 133,386
Number of Securities | security | 611 | 611
U.S. Government-sponsored mortgage-backed securities |  |
Fair Value |  |
Less than 12 Months | $ 55,519 | $ 82,724
12 Months or Longer | 320,890 | 318,310
Total | 376,409 | 401,034
Gross Unrealized Losses |  |
Less than 12 Months | 645 | 1,660
12 Months or Longer | 76,969 | 87,064
Total | $ 77,614 | $ 88,724
Number of Securities | security | 114 | 127
Corporate obligations |  |
Fair Value |  |
Less than 12 Months | $ 0 | $ 0
12 Months or Longer | 12,402 | 12,268
Total | 12,402 | 12,268
Gross Unrealized Losses |  |
Less than 12 Months | 0 | 0
12 Months or Longer | 530 | 662
Total | $ 530 | $ 662
Number of Securities | security | 10 | 10

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