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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)