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INVESTMENT SECURITIES - Schedule of Gross Unrealized Losses and Fair Value of Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Estimated Fair Value |  |
Less Than 12 Months | $ 152,501 | $ 162,258
12 Months or More | 1,208,344 | 1,154,553
Total | 1,360,845 | 1,316,811
Unrealized Losses |  |
Less Than 12 Months | (887) | (827)
12 Months or More | (47,284) | (43,909)
Total | (48,171) | (44,736)
U.S. Treasuries |  |
Estimated Fair Value |  |
Less Than 12 Months | 28,673 | 159,667
12 Months or More | 656,429 | 537,313
Total | 685,102 | 696,980
Unrealized Losses |  |
Less Than 12 Months | (354) | (827)
12 Months or More | (9,850) | (10,966)
Total | (10,204) | (11,793)
U.S. government-sponsored agencies |  |
Estimated Fair Value |  |
Less Than 12 Months | 0 | 0
12 Months or More | 981 | 985
Total | 981 | 985
Unrealized Losses |  |
Less Than 12 Months | 0 | 0
12 Months or More | (35) | (38)
Total | (35) | (38)
State, county and municipal securities |  |
Estimated Fair Value |  |
Less Than 12 Months | 5,930 | 1,923
12 Months or More | 19,545 | 19,754
Total | 25,475 | 21,677
Unrealized Losses |  |
Less Than 12 Months | (31) | 0
12 Months or More | (1,257) | (944)
Total | (1,288) | (944)
Corporate debt securities |  |
Estimated Fair Value |  |
Less Than 12 Months | 499 | 500
12 Months or More | 8,502 | 8,527
Total | 9,001 | 9,027
Unrealized Losses |  |
Less Than 12 Months | (1) | 0
12 Months or More | (876) | (850)
Total | (877) | (850)
SBA pool securities |  |
Estimated Fair Value |  |
Less Than 12 Months | 57,303 | 42
12 Months or More | 18,815 | 21,267
Total | 76,118 | 21,309
Unrealized Losses |  |
Less Than 12 Months | (68) | 0
12 Months or More | (1,519) | (1,519)
Total | (1,587) | (1,519)
Mortgage-backed securities |  |
Estimated Fair Value |  |
Less Than 12 Months | 60,096 | 126
12 Months or More | 504,072 | 566,707
Total | 564,168 | 566,833
Unrealized Losses |  |
Less Than 12 Months | (433) | 0
12 Months or More | (33,747) | (29,592)
Total | $ (34,180) | $ (29,592)

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