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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Reclassifications (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Interest income $ 95,018 $ 88,623 $ 279,788 $ 252,325
Income tax expense 4,400 4,479 13,175 10,130
Other expense 2,552 2,609 10,918 7,742
Net income 23,338 25,252 69,288 64,141
Amount Reclassified From Accumulated Other Comprehensive Income (Loss)        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net income (397) (434) (1,234) (1,219)
Amount Reclassified From Accumulated Other Comprehensive Income (Loss) | Debt Securities        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income tax expense 103   320  
Net income (385)   (1,199)  
Amount Reclassified From Accumulated Other Comprehensive Income (Loss) | Held-to-Maturity Securities        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Interest income (488) (501) (1,473) (1,486)
Income tax expense   113   316
Net income   (423)   (1,186)
Amount Reclassified From Accumulated Other Comprehensive Income (Loss) | Available-for-Sale Securities        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net securities gains (losses) 0 (35) (46) (16)
Income tax expense 103      
Amount Reclassified From Accumulated Other Comprehensive Income (Loss) | Defined Benefit Pension Items        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income tax expense 4 4 12 12
Other expense (16) (15) (47) (45)
Net income $ (12) $ (11) $ (35) $ (33)