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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Other Comprehensive Income (Loss), before Reclassification Adjustments and Tax [Abstract]        
Unrealized gain (loss) on debt securities $ 65,858 $ (14,461) $ 8,447  
Unrealized gain (loss) on derivatives 281 628 810  
Retirement obligations 4,630 (12,319) 2,775  
Total 70,769 (26,152) 12,032  
Other Comprehensive Income (Loss) Reclassifications before Tax [Abstract]        
Unrealized gain (loss) on debt securities (370) (161) 1,649  
Unrealized gain (loss) on derivatives 0 0 0  
Retirement obligation 1,390 1,775 1,511  
Total (1,760) (1,936) 138  
Transactions Pre-tax        
Unrealized gain (loss) on debt securities 66,228 (14,300) 6,798  
Unrealized gain (loss) on derivatives 281 628 810  
Retirement obligation 6,020 (10,544) 4,286  
Total 72,529 (24,216) 11,894  
Transactions Tax-effect        
Unrealized gain (loss) on debt securities (14,269) 3,071 (2,431)  
Unrealized gain (loss) on derivatives (64) (144) (296)  
Retirement obligation (1,371) 2,364 (1,114)  
Total (15,704) 5,291 (3,841)  
Transactions Net of tax        
Unrealized gain (loss) on debt securities 51,959 (11,229) 4,367  
Unrealized gain (loss) on derivatives 217 484 514  
Retirement obligation 4,649 (8,180) 3,172  
Total 56,825 (18,925) 8,053  
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 41,264 (11,601) (182) $ (4,549)
Unrealized gain (loss) on derivatives 0 (217) (577) (1,091)
Retirement obligation (27,941) (32,590) (19,631) (22,803)
Total $ 13,323 $ (44,408) $ (20,390) $ (28,443)