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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Other Comprehensive Income (Loss), before Reclassification Adjustments and Tax [Abstract]        
Unrealized gain (loss) on investment securities $ 29,725 $ (12,536)    
Unrealized gain (loss) on derivatives 93 202    
Retirement obligation 0 0    
Total 29,818 (12,334)    
Other Comprehensive Income (Loss) Reclassifications before Tax [Abstract]        
Unrealized gain (loss) on investment securities (178) 0    
Unrealized gain (loss) on derivatives 0 0    
Retirement obligation (375) (419)    
Total (553) (419)    
Transactions Pre-tax        
Unrealized gain (loss) on investment securities 29,903 (12,536)    
Unrealized gain (loss) on derivatives 93 202    
Unfunded pension obligation 375 419    
Total 30,371 (11,915)    
Transactions Tax-effect        
Unrealized gain (loss) on investment securities (6,398) 2,706    
Unrealized gain (loss) on derivatives (21) (46)    
Retirement obligation (85) (96)    
Total (6,504) 2,564    
Transactions Net of tax        
Unrealized gain (loss) on investment securities 23,505 (9,830)    
Unrealized gain (loss) on derivatives 72 156    
Retirement obligation 290 323    
Total 23,867 (9,351)    
Stranded Tax Effects        
Unrealized gain (loss) on investment securities 906      
Unrealized gain (loss) on Derivatives 0 (124)    
Retirement obligation 0 (4,779)    
Total 906 (5,093)    
Balances Net of tax        
Unrealized gain (loss) on investment securities 12,810 (10,202) $ (11,601) $ (182)
Unrealized gain (loss) on cash flow hedges (145) (545) (217) (577)
Retirement obligation (32,300) (24,087) (32,590) (19,631)
Total (19,635) (34,834) $ (44,408) $ (20,390)
Accumulated other comprehensive income (loss)        
Transactions Net of tax        
Total $ 23,867 $ (9,351)