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INVESTMENT SECURITIES - Schedule of Gross Unrealized Losses and Fair Value of Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Estimated Fair Value |  |
Less Than 12 Months | $ 245,513 | $ 162,258
12 Months or More | 1,159,293 | 1,154,553
Total | 1,404,806 | 1,316,811
Unrealized Losses |  |
Less Than 12 Months | (1,576) | (827)
12 Months or More | (48,506) | (43,909)
Total | (50,082) | (44,736)
U.S. Treasuries |  |
Estimated Fair Value |  |
Less Than 12 Months | 133,526 | 159,667
12 Months or More | 562,763 | 537,313
Total | 696,289 | 696,980
Unrealized Losses |  |
Less Than 12 Months | (1,129) | (827)
12 Months or More | (10,568) | (10,966)
Total | (11,697) | (11,793)
U.S. government-sponsored agencies |  |
Estimated Fair Value |  |
Less Than 12 Months | 0 | 0
12 Months or More | 980 | 985
Total | 980 | 985
Unrealized Losses |  |
Less Than 12 Months | 0 | 0
12 Months or More | (40) | (38)
Total | (40) | (38)
State, county and municipal securities |  |
Estimated Fair Value |  |
Less Than 12 Months | 5,362 | 1,923
12 Months or More | 19,502 | 19,754
Total | 24,864 | 21,677
Unrealized Losses |  |
Less Than 12 Months | (10) | 0
12 Months or More | (1,127) | (944)
Total | (1,137) | (944)
Corporate debt securities |  |
Estimated Fair Value |  |
Less Than 12 Months | 499 | 500
12 Months or More | 8,515 | 8,527
Total | 9,014 | 9,027
Unrealized Losses |  |
Less Than 12 Months | (1) | 0
12 Months or More | (858) | (850)
Total | (859) | (850)
SBA pool securities |  |
Estimated Fair Value |  |
Less Than 12 Months | 58,947 | 42
12 Months or More | 19,333 | 21,267
Total | 78,280 | 21,309
Unrealized Losses |  |
Less Than 12 Months | (147) | 0
12 Months or More | (1,590) | (1,519)
Total | (1,737) | (1,519)
Mortgage-backed securities |  |
Estimated Fair Value |  |
Less Than 12 Months | 47,179 | 126
12 Months or More | 548,200 | 566,707
Total | 595,379 | 566,833
Unrealized Losses |  |
Less Than 12 Months | (289) | 0
12 Months or More | (34,323) | (29,592)
Total | $ (34,612) | $ (29,592)

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