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INVESTMENT SECURITIES - Schedule of Gross Unrealized Losses and Fair Value of Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Estimated Fair Value |  |
Less Than 12 Months | $ 2,761 | $ 507,188
12 Months or More | 546,745 | 878,229
Total | 549,506 | 1,385,417
Unrealized Losses |  |
Less Than 12 Months | (393) | (3,696)
12 Months or More | (15,534) | (35,342)
Total | (15,927) | (39,038)
U.S. Treasuries |  |
Estimated Fair Value |  |
Less Than 12 Months | 0 | 272,564
12 Months or More | 56,396 | 353,787
Total | 56,396 | 626,351
Unrealized Losses |  |
Less Than 12 Months | 0 | (1,376)
12 Months or More | (562) | (3,689)
Total | (562) | (5,065)
U.S. government-sponsored agencies |  |
Estimated Fair Value |  |
Less Than 12 Months |  | 0
12 Months or More |  | 994
Total |  | 994
Unrealized Losses |  |
Less Than 12 Months |  | 0
12 Months or More |  | (16)
Total |  | (16)
State, county and municipal securities |  |
Estimated Fair Value |  |
Less Than 12 Months | 0 | 3,953
12 Months or More | 14,920 | 15,940
Total | 14,920 | 19,893
Unrealized Losses |  |
Less Than 12 Months | 0 | (17)
12 Months or More | (541) | (1,053)
Total | (541) | (1,070)
Corporate debt securities |  |
Estimated Fair Value |  |
Less Than 12 Months | 1,050 | 383
12 Months or More | 7,461 | 8,400
Total | 8,511 | 8,783
Unrealized Losses |  |
Less Than 12 Months | (376) | (13)
12 Months or More | (89) | (581)
Total | (465) | (594)
SBA pool securities |  |
Estimated Fair Value |  |
Less Than 12 Months | 33 | 52,850
12 Months or More | 12,745 | 17,491
Total | 12,778 | 70,341
Unrealized Losses |  |
Less Than 12 Months | 0 | (322)
12 Months or More | (691) | (1,232)
Total | (691) | (1,554)
Mortgage-backed securities |  |
Estimated Fair Value |  |
Less Than 12 Months | 1,678 | 177,438
12 Months or More | 455,223 | 481,617
Total | 456,901 | 659,055
Unrealized Losses |  |
Less Than 12 Months | (17) | (1,968)
12 Months or More | (13,651) | (28,771)
Total | $ (13,668) | $ (30,739)

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