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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Other Comprehensive Income (Loss), before Reclassification Adjustments and Tax [Abstract]        
Unrealized gain (loss) on debt securities $ 36,643 $ 65,858 $ (14,461)  
Unrealized gain (loss) on derivatives 0 281 628  
Retirement obligations 2,001 4,630 (12,319)  
Total 38,644 70,769 (26,152)  
Other Comprehensive Income (Loss) Reclassifications before Tax [Abstract]        
Unrealized gain (loss) on debt securities (4,563) (370) (161)  
Unrealized gain (loss) on derivatives 0 0 0  
Retirement obligation 1,921 1,390 1,775  
Total (6,484) (1,760) (1,936)  
Transactions Pre-tax        
Unrealized gain (loss) on debt securities 41,206 66,228 (14,300)  
Unrealized gain (loss) on derivatives 0 281 628  
Retirement obligation 3,922 6,020 (10,544)  
Total 45,128 72,529 (24,216)  
Transactions Tax-effect        
Unrealized gain (loss) on debt securities (8,894) (14,269) 3,071  
Unrealized gain (loss) on derivatives 0 (64) (144)  
Retirement obligation (893) (1,371) 2,364  
Total (9,787) (15,704) 5,291  
Transactions Net of tax        
Unrealized gain (loss) on debt securities 32,312 51,959 (11,229)  
Unrealized gain (loss) on derivatives 0 217 484  
Retirement obligation 3,029 4,649 (8,180)  
Total 35,341 56,825 (18,925)  
Cumulative effect of accounting change        
Unrealized gain (loss) on debt securities   906 (190)  
Unrealized gain (loss) on derivatives   0 (124)  
Retirement obligation   0 (4,779)  
Total   906 (5,093)  
Balances Net of tax        
Unrealized gain (loss) on debt securities 73,576 41,264 (11,601) $ (182)
Unrealized gain (loss) on derivatives 0 0 (217) (577)
Retirement obligation (24,912) (27,941) (32,590) (19,631)
Total $ 48,664 $ 13,323 $ (44,408) $ (20,390)