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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Reclassifications Out of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                    
Income tax expense $ (5,482) $ (5,111) $ (4,953) $ (2,906) $ (3,699) $ (3,571) $ (2,880) $ (3,777) $ (18,452) $ (13,927)
Reclassifications out of accumulated other comprehensive (loss) income                    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                    
Realized gain on sale of available for sale securities                 3,286  
Income tax expense                 (1,036)  
Total reclassifications, net of income tax                 $ 2,250