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ACCUMULATED OTHER COMPREHENSIVE LOSS (Accumulated Comprehensive Income, Net of Income Tax) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive loss, net of income taxes $ (81,731) $ (67,013)
AOCI Attributable to Parent    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive loss, net of income taxes (81,731) (67,013)
Net unrealized gain (loss) on securities available-for-sale    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Unrealized loss on securities available-for-sale (96,047) (78,497)
Income tax effect of unrealized loss on securities available-for-sale 14,316 11,484
Net unrealized loss on securities available-for-sale $ (81,731) $ (67,013)