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INVESTMENT SECURITIES - Continuous Unrealized Loss on Investment (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
AFS |  |
AFS, Less than 12 months, Gross unrealized losses | $ (91) | $ (579)
AFS, Less than 12 months, Fair value | 15,120 | 135,407
AFS, Twelve months or more, Gross unrealized losses | (91,427) | (115,685)
AFS, Twelve months or more, Fair value | 1,027,977 | 1,055,874
AFS, Total, Gross unrealized losses | (91,518) | (116,264)
AFS, Total, Fair value | 1,043,097 | 1,191,281
Residential mortgage-backed securities |  |
AFS |  |
AFS, Less than 12 months, Gross unrealized losses | 0 | (3)
AFS, Less than 12 months, Fair value | 0 | 1,145
AFS, Twelve months or more, Gross unrealized losses | (5,490) | (10,457)
AFS, Twelve months or more, Fair value | 163,801 | 177,393
AFS, Total, Gross unrealized losses | (5,490) | (10,460)
AFS, Total, Fair value | 163,801 | 178,538
Commercial mortgage-backed securities |  |
AFS |  |
AFS, Less than 12 months, Gross unrealized losses | 0 | 0
AFS, Less than 12 months, Fair value | 0 | 61
AFS, Twelve months or more, Gross unrealized losses | (5,602) | (7,479)
AFS, Twelve months or more, Fair value | 49,178 | 47,695
AFS, Total, Gross unrealized losses | (5,602) | (7,479)
AFS, Total, Fair value | 49,178 | 47,756
Residential collateralized mortgage obligations |  |
AFS |  |
AFS, Less than 12 months, Gross unrealized losses | 0 | (368)
AFS, Less than 12 months, Fair value | 2,066 | 83,815
AFS, Twelve months or more, Gross unrealized losses | (25,080) | (33,171)
AFS, Twelve months or more, Fair value | 319,501 | 348,914
AFS, Total, Gross unrealized losses | (25,080) | (33,539)
AFS, Total, Fair value | 321,567 | 432,729
Commercial collateralized mortgage obligations |  |
AFS |  |
AFS, Less than 12 months, Gross unrealized losses | 0 | 0
AFS, Less than 12 months, Fair value | 0 | 0
AFS, Twelve months or more, Gross unrealized losses | (4,222) | (6,059)
AFS, Twelve months or more, Fair value | 56,638 | 57,397
AFS, Total, Gross unrealized losses | (4,222) | (6,059)
AFS, Total, Fair value | 56,638 | 57,397
Municipal bonds |  |
AFS |  |
AFS, Less than 12 months, Gross unrealized losses | (91) | (73)
AFS, Less than 12 months, Fair value | 13,054 | 7,489
AFS, Twelve months or more, Gross unrealized losses | (42,059) | (47,780)
AFS, Twelve months or more, Fair value | 357,312 | 364,775
AFS, Total, Gross unrealized losses | (42,150) | (47,853)
AFS, Total, Fair value | 370,366 | 372,264
HTM |  |
HFM, Less than 12 months, Gross unrealized losses | 0 | 0
HFM, Less than 12 months, Fair value | 0 | 0
HFM, 12 months or more, Gross unrealized losses | (22) | (40)
HFM, 12 months or more, Fair value | 2,296 | 2,331
HFM, Total, Gross unrealized losses | (22) | (40)
HTM, Total, Fair value | 2,296 | 2,331
Corporate debt securities |  |
AFS |  |
AFS, Less than 12 months, Gross unrealized losses | 0 | 0
AFS, Less than 12 months, Fair value | 0 | 0
AFS, Twelve months or more, Gross unrealized losses | (6,195) | (7,098)
AFS, Twelve months or more, Fair value | 24,949 | 28,513
AFS, Total, Gross unrealized losses | (6,195) | (7,098)
AFS, Total, Fair value | 24,949 | 28,513
U.S. Treasury securities |  |
AFS |  |
AFS, Less than 12 months, Gross unrealized losses | 0 | 0
AFS, Less than 12 months, Fair value | 0 | 0
AFS, Twelve months or more, Gross unrealized losses | (1,890) | (2,474)
AFS, Twelve months or more, Fair value | 20,505 | 20,184
AFS, Total, Gross unrealized losses | (1,890) | (2,474)
AFS, Total, Fair value | 20,505 | 20,184
Agency debentures |  |
AFS |  |
AFS, Less than 12 months, Gross unrealized losses | 0 | (135)
AFS, Less than 12 months, Fair value | 0 | 42,897
AFS, Twelve months or more, Gross unrealized losses | (889) | (1,167)
AFS, Twelve months or more, Fair value | 36,093 | 11,003
AFS, Total, Gross unrealized losses | (889) | (1,302)
AFS, Total, Fair value | $ 36,093 | $ 53,900

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