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INVESTMENT SECURITIES - INVESTMENT CATEGORY (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Available-for-sale debt securities |  |
Less than 12 months Fair Value | $ 30,286 | $ 355,064
Less than 12 months Unrealized Losses | (159) | (15,999)
12 months or more Fair Value | 533,745 | 237,202
12 months or more Unrealized Losses | (28,921) | (28,076)
Total Fair Value | 564,031 | 592,266
Total Unrealized Losses | $ (29,080) | $ (44,075)
Number of securities held | 191 | 179
Number of securities held in an unrealized loss position | 144 | 163
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 | $ 26,707 | $ 229,372
Less than 12 months Unrealized Losses | (84) | (7,139)
12 months or more Fair Value | 380,326 | 171,676
12 months or more Unrealized Losses | (14,459) | (18,054)
Total Fair Value | 407,033 | 401,048
Total Unrealized Losses | (14,543) | (25,193)
Mortgage backed securities - residential |  |
Available-for-sale debt securities |  |
Less than 12 months Fair Value | 1,911 | 105,274
Less than 12 months Unrealized Losses | (23) | (7,434)
12 months or more Fair Value | 136,180 | 65,520
12 months or more Unrealized Losses | (13,439) | (10,021)
Total Fair Value | 138,091 | 170,794
Total Unrealized Losses | (13,462) | (17,455)
Collateralized mortgage obligations |  |
Available-for-sale debt securities |  |
Less than 12 months Fair Value | 1,668 | 20,418
Less than 12 months Unrealized Losses | (52) | (1,426)
12 months or more Fair Value | 17,239 | 6
12 months or more Unrealized Losses | (1,023) | (1)
Total Fair Value | 18,907 | 20,424
Total Unrealized Losses | $ (1,075) | $ (1,427)

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