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INVESTMENT SECURITIES - Schedule of Gross Unrealized Losses and Fair Value of Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Estimated Fair Value |  |
Less Than 12 Months | $ 214,037 | $ 507,188
12 Months or More | 890,239 | 878,229
Total | 1,104,276 | 1,385,417
Unrealized Losses |  |
Less Than 12 Months | (802) | (3,696)
12 Months or More | (24,982) | (35,342)
Total | (25,784) | (39,038)
U.S. Treasuries |  |
Estimated Fair Value |  |
Less Than 12 Months | 125,476 | 272,564
12 Months or More | 329,568 | 353,787
Total | 455,044 | 626,351
Unrealized Losses |  |
Less Than 12 Months | (88) | (1,376)
12 Months or More | (1,333) | (3,689)
Total | (1,421) | (5,065)
U.S. government-sponsored agencies |  |
Estimated Fair Value |  |
Less Than 12 Months | 0 | 0
12 Months or More | 996 | 994
Total | 996 | 994
Unrealized Losses |  |
Less Than 12 Months | 0 | 0
12 Months or More | (11) | (16)
Total | (11) | (16)
State, county and municipal securities |  |
Estimated Fair Value |  |
Less Than 12 Months | 512 | 3,953
12 Months or More | 15,959 | 15,940
Total | 16,471 | 19,893
Unrealized Losses |  |
Less Than 12 Months | (6) | (17)
12 Months or More | (970) | (1,053)
Total | (976) | (1,070)
Corporate debt securities |  |
Estimated Fair Value |  |
Less Than 12 Months | 395 | 383
12 Months or More | 8,547 | 8,400
Total | 8,942 | 8,783
Unrealized Losses |  |
Less Than 12 Months | (1) | (13)
12 Months or More | (434) | (581)
Total | (435) | (594)
SBA pool securities |  |
Estimated Fair Value |  |
Less Than 12 Months | 36 | 52,850
12 Months or More | 40,438 | 17,491
Total | 40,474 | 70,341
Unrealized Losses |  |
Less Than 12 Months | 0 | (322)
12 Months or More | (1,084) | (1,232)
Total | (1,084) | (1,554)
Mortgage-backed securities |  |
Estimated Fair Value |  |
Less Than 12 Months | 87,618 | 177,438
12 Months or More | 494,731 | 481,617
Total | 582,349 | 659,055
Unrealized Losses |  |
Less Than 12 Months | (707) | (1,968)
12 Months or More | (21,150) | (28,771)
Total | $ (21,857) | $ (30,739)

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