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INVESTMENT SECURITIES - Schedule of Gross Unrealized Losses and Fair Value of Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Estimated Fair Value |  |
Less than 12 months, estimated fair value | $ 891,875 | $ 1,405,288
12 months or more, estimated fair value | 385,315 | 27,331
Total estimated fair value | 1,277,190 | 1,432,619
Unrealized Losses |  |
Less than 12 months, unrealized losses | (24,010) | (56,816)
12 months or more, unrealized losses | (21,466) | (2,318)
Total unrealized losses | (45,476) | (59,134)
U.S. Treasuries |  |
Estimated Fair Value |  |
Less than 12 months, estimated fair value | 509,696 | 725,250
12 months or more, estimated fair value | 73,070 | 0
Total estimated fair value | 582,766 | 725,250
Unrealized Losses |  |
Less than 12 months, unrealized losses | (9,501) | (16,381)
12 months or more, unrealized losses | (1,864) | 0
Total unrealized losses | (11,365) | (16,381)
U.S. government-sponsored agencies |  |
Estimated Fair Value |  |
Less than 12 months, estimated fair value | 0 | 979
12 months or more, estimated fair value | 987 | 0
Total estimated fair value | 987 | 979
Unrealized Losses |  |
Less than 12 months, unrealized losses | 0 | (57)
12 months or more, unrealized losses | (45) | 0
Total unrealized losses | (45) | (57)
State, county and municipal securities |  |
Estimated Fair Value |  |
Less than 12 months, estimated fair value | 11,374 | 27,438
12 months or more, estimated fair value | 12,223 | 0
Total estimated fair value | 23,597 | 27,438
Unrealized Losses |  |
Less than 12 months, unrealized losses | (174) | (1,180)
12 months or more, unrealized losses | (599) | 0
Total unrealized losses | (773) | (1,180)
Corporate debt securities |  |
Estimated Fair Value |  |
Less than 12 months, estimated fair value | 888 | 13,271
12 months or more, estimated fair value | 13,223 | 1,155
Total estimated fair value | 14,111 | 14,426
Unrealized Losses |  |
Less than 12 months, unrealized losses | (10) | (126)
12 months or more, unrealized losses | (695) | (270)
Total unrealized losses | (705) | (396)
SBA pool securities |  |
Estimated Fair Value |  |
Less than 12 months, estimated fair value | 472 | 17,806
12 months or more, estimated fair value | 24,660 | 9,329
Total estimated fair value | 25,132 | 27,135
Unrealized Losses |  |
Less than 12 months, unrealized losses | (20) | (1,298)
12 months or more, unrealized losses | (1,583) | (729)
Total unrealized losses | (1,603) | (2,027)
Mortgage-backed securities |  |
Estimated Fair Value |  |
Less than 12 months, estimated fair value | 369,445 | 620,544
12 months or more, estimated fair value | 261,152 | 16,847
Total estimated fair value | 630,597 | 637,391
Unrealized Losses |  |
Less than 12 months, unrealized losses | (14,305) | (37,774)
12 months or more, unrealized losses | (16,680) | (1,319)
Total unrealized losses | $ (30,985) | $ (39,093)

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