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INVESTMENT SECURITIES - Available for sale securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
AVAILABLE-FOR-SALE SECURITIES: |  |
Amortized Cost | $ 526,235 | $ 531,892
Gross Unrealized Gains | 182 | 534
Gross Unrealized Losses | 61,109 | 54,219
Fair Value | 465,308 | 478,207
Agency mortgage-backed securities |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Amortized Cost | 312,068 | 316,114
Gross Unrealized Gains |  | 7
Gross Unrealized Losses | 40,816 | 35,890
Fair Value | 271,252 | 280,231
Agency collateralized mortgage obligations |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Amortized Cost | 85,549 | 85,989
Gross Unrealized Losses | 10,242 | 10,043
Fair Value | 75,307 | 75,946
States and political subdivisions securities |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Amortized Cost | 59,009 | 59,141
Gross Unrealized Gains | 182 | 527
Gross Unrealized Losses | 2,208 | 1,531
Fair Value | 56,983 | 58,137
Small Business Administration securities |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Amortized Cost | 69,609 | 70,648
Gross Unrealized Losses | 7,843 | 6,755
Fair Value | $ 61,766 | $ 63,893

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