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INVESTMENT SECURITIES - INVESTMENT CATEGORY (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Available-for-sale debt securities    
Less than 12 months Fair Value $ 41,907 $ 355,064
Less than 12 months Unrealized Losses (879) (15,999)
12 months or more Fair Value 532,790 237,202
12 months or more Unrealized Losses (41,489) (28,076)
Total Fair Value 574,697 592,266
Total Unrealized Losses $ (42,368) $ (44,075)
Number of securities held 191 179
Number of securities held in an unrealized loss position 172 163
Maximum percentage of holdings of securities of any one issuer, other than the U.S. Government and its agencies 10.00% 10.00%
U.S. Treasury securities and U.S. Government agencies    
Available-for-sale debt securities    
Less than 12 months Fair Value $ 26,661 $ 229,372
Less than 12 months Unrealized Losses (128) (7,139)
12 months or more Fair Value 373,950 171,676
12 months or more Unrealized Losses (20,773) (18,054)
Total Fair Value 400,611 401,048
Total Unrealized Losses (20,901) (25,193)
Mortgage backed securities - residential    
Available-for-sale debt securities    
Less than 12 months Fair Value 11,905 105,274
Less than 12 months Unrealized Losses (628) (7,434)
12 months or more Fair Value 141,948 65,520
12 months or more Unrealized Losses (19,532) (10,021)
Total Fair Value 153,853 170,794
Total Unrealized Losses (20,160) (17,455)
Collateralized mortgage obligations    
Available-for-sale debt securities    
Less than 12 months Fair Value 3,341 20,418
Less than 12 months Unrealized Losses (123) (1,426)
12 months or more Fair Value 16,892 6
12 months or more Unrealized Losses (1,184) (1)
Total Fair Value 20,233 20,424
Total Unrealized Losses $ (1,307) $ (1,427)