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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Other Comprehensive Income (Loss), before Reclassification Adjustments and Tax [Abstract]        
Unrealized gain (loss) on investment securities $ (39,658) $ (2,434)    
Retirement obligation 0 0    
Total (39,658) (2,434)    
Other Comprehensive Income (Loss) Reclassifications before Tax [Abstract]        
Realized gain (loss) on securities available-for-sale (166) (59)    
Retirement obligation (525) (425)    
Total (691) (484)    
Transactions Pre-tax        
Unrealized gain (loss) on investment securities (39,492) (2,375)    
Unfunded pension obligation 525 425    
Total (38,967) (1,950)    
Transactions Tax-effect        
Unrealized gain (loss) on investment securities 8,524 512    
Retirement obligation (120) (97)    
Total 8,404 415    
Transactions Net of tax        
Unrealized gain (loss) on investment securities (30,968) (1,863)    
Retirement obligation 405 328    
Total (30,563) (1,535)    
Balances Net of tax        
Unrealized gain (loss) on investment securities 42,608 39,401 $ 73,576 $ 41,264
Retirement obligation (24,507) (27,613) (24,912) (27,941)
Total 18,101 11,788 $ 48,664 $ 13,323
Accumulated other comprehensive income (loss)        
Transactions Net of tax        
Total $ (30,563) $ (1,535)