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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Changes in AOCI) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Changes in each component of AOCI, net of tax    
Beginning balance $ 503,815 $ 452,871
Other comprehensive loss (1,727) 11,256
Ending balance 507,203 470,926
Investment Securities    
Changes in each component of AOCI, net of tax    
Beginning balance (127,922) (149,109)
Other comprehensive income (loss) before reclassifications (5,180) 11,206
Reclassification adjustments from AOCI 1,206 1,225
Other comprehensive loss (3,974) 12,431
Ending balance (131,896) (136,678)
Derivatives    
Changes in each component of AOCI, net of tax    
Beginning balance 5,029 4,645
Other comprehensive income (loss) before reclassifications 2,247 (1,163)
Reclassification adjustments from AOCI 0 0
Other comprehensive loss 2,247 (1,163)
Ending balance 7,276 3,482
SERP    
Changes in each component of AOCI, net of tax    
Beginning balance 297 480
Other comprehensive income (loss) before reclassifications 0 0
Reclassification adjustments from AOCI 0 (12)
Other comprehensive loss 0 (12)
Ending balance 297 468
Accum. Other Comp. Loss    
Changes in each component of AOCI, net of tax    
Beginning balance (122,596) (143,984)
Other comprehensive income (loss) before reclassifications (2,933) 10,043
Reclassification adjustments from AOCI 1,206 1,213
Other comprehensive loss (1,727) 11,256
Ending balance $ (124,323) $ (132,728)