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INVESTMENT SECURITIES - INVESTMENT CATEGORY (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Available-for-sale debt securities |  |
Less than 12 months Fair Value | $ 72,603 | $ 30,286
Less than 12 months Unrealized Losses | (696) | (159)
12 months or more Fair Value | 498,084 | 533,745
12 months or more Unrealized Losses | (27,619) | (28,921)
Total Fair Value | 570,687 | 564,031
Total Unrealized Losses | $ (28,315) | $ (29,080)
Number of securities held | 194 | 191
Number of securities held in an unrealized loss position | 155 | 144
Maximum percentage of holdings of securities of any one issuer, other than the U.S. Government and its agencies | 10.00% |
U.S. Treasury securities and U.S. Government agencies |  |
Available-for-sale debt securities |  |
Less than 12 months Fair Value | $ 61,177 | $ 26,707
Less than 12 months Unrealized Losses | (430) | (84)
12 months or more Fair Value | 351,949 | 380,326
12 months or more Unrealized Losses | (12,859) | (14,459)
Total Fair Value | 413,126 | 407,033
Total Unrealized Losses | (13,289) | (14,543)
Mortgage backed securities - residential |  |
Available-for-sale debt securities |  |
Less than 12 months Fair Value | 9,818 | 1,911
Less than 12 months Unrealized Losses | (194) | (23)
12 months or more Fair Value | 129,370 | 136,180
12 months or more Unrealized Losses | (13,756) | (13,439)
Total Fair Value | 139,188 | 138,091
Total Unrealized Losses | (13,950) | (13,462)
Collateralized mortgage obligations |  |
Available-for-sale debt securities |  |
Less than 12 months Fair Value | 1,608 | 1,668
Less than 12 months Unrealized Losses | (72) | (52)
12 months or more Fair Value | 16,765 | 17,239
12 months or more Unrealized Losses | (1,004) | (1,023)
Total Fair Value | 18,373 | 18,907
Total Unrealized Losses | $ (1,076) | $ (1,075)

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