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INVESTMENT SECURITIES - Continuous Unrealized Loss on Investment (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
AFS |  |
AFS, Less than 12 months, Gross unrealized losses | $ (165) | $ (579)
AFS, Less than 12 months, Fair value | 36,141 | 135,407
AFS, Twelve months or more, Gross unrealized losses | (121,390) | (115,685)
AFS, Twelve months or more, Fair value | 1,077,172 | 1,055,874
AFS, Total, Gross unrealized losses | (121,555) | (116,264)
AFS, Total, Fair value | 1,113,313 | 1,191,281
Residential mortgage-backed securities |  |
AFS |  |
AFS, Less than 12 months, Gross unrealized losses | (2) | (3)
AFS, Less than 12 months, Fair value | 722 | 1,145
AFS, Twelve months or more, Gross unrealized losses | (10,879) | (10,457)
AFS, Twelve months or more, Fair value | 171,977 | 177,393
AFS, Total, Gross unrealized losses | (10,881) | (10,460)
AFS, Total, Fair value | 172,699 | 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 | (7,613) | (7,479)
AFS, Twelve months or more, Fair value | 47,470 | 47,695
AFS, Total, Gross unrealized losses | (7,613) | (7,479)
AFS, Total, Fair value | 47,470 | 47,756
Residential collateralized mortgage obligations |  |
AFS |  |
AFS, Less than 12 months, Gross unrealized losses | (51) | (368)
AFS, Less than 12 months, Fair value | 14,896 | 83,815
AFS, Twelve months or more, Gross unrealized losses | (35,465) | (33,171)
AFS, Twelve months or more, Fair value | 346,156 | 348,914
AFS, Total, Gross unrealized losses | (35,516) | (33,539)
AFS, Total, Fair value | 361,052 | 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 | (6,000) | (6,059)
AFS, Twelve months or more, Fair value | 56,702 | 57,397
AFS, Total, Gross unrealized losses | (6,000) | (6,059)
AFS, Total, Fair value | 56,702 | 57,397
Municipal bonds |  |
AFS |  |
AFS, Less than 12 months, Gross unrealized losses | (109) | (73)
AFS, Less than 12 months, Fair value | 15,526 | 7,489
AFS, Twelve months or more, Gross unrealized losses | (51,349) | (47,780)
AFS, Twelve months or more, Fair value | 361,384 | 364,775
AFS, Total, Gross unrealized losses | (51,458) | (47,853)
AFS, Total, Fair value | 376,910 | 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 | (49) | (40)
HFM, 12 months or more, Fair value | 2,305 | 2,331
HFM, Total, Gross unrealized losses | (49) | (40)
HTM, Total, Fair value | 2,305 | 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 | (6,012) | (7,098)
AFS, Twelve months or more, Fair value | 25,147 | 28,513
AFS, Total, Gross unrealized losses | (6,012) | (7,098)
AFS, Total, Fair value | 25,147 | 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 | (2,675) | (2,474)
AFS, Twelve months or more, Fair value | 19,896 | 20,184
AFS, Total, Gross unrealized losses | (2,675) | (2,474)
AFS, Total, Fair value | 19,896 | 20,184
Agency debentures |  |
AFS |  |
AFS, Less than 12 months, Gross unrealized losses | (3) | (135)
AFS, Less than 12 months, Fair value | 4,997 | 42,897
AFS, Twelve months or more, Gross unrealized losses | (1,397) | (1,167)
AFS, Twelve months or more, Fair value | 48,440 | 11,003
AFS, Total, Gross unrealized losses | (1,400) | (1,302)
AFS, Total, Fair value | $ 53,437 | $ 53,900

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