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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Other Comprehensive Income (Loss), before Reclassification Adjustments and Tax [Abstract]                
Unrealized gain (loss) on investment securities $ (13,138) $ 2,612 $ (37,130) $ 12,614        
Unrealized gain (loss) on derivatives 130 202 535 607        
Retirement obligation 0 0 0 0        
Total (13,008) 2,814 (36,595) 13,221        
Other Comprehensive Income (Loss) Reclassifications before Tax [Abstract]                
Unrealized gain (loss) on investment securities (167) 276 (197) 1,630        
Unrealized gain (loss) on derivatives 0 0 0 0        
Retirement obligation (452) (335) (1,323) (1,005)        
Total (619) (59) (1,520) 625        
Transactions Pre-tax                
Unrealized gain (loss) on investment securities (12,971) 2,336 (36,933) 10,984        
Unrealized gain (loss) on derivatives 130 202 535 607        
Unfunded pension obligation 452 335 1,323 1,005        
Total (12,389) 2,873 (35,075) 12,596        
Transactions Tax-effect                
Unrealized gain (loss) on investment securities 2,786 (835) 7,940 (3,920)        
Unrealized gain (loss) on derivatives (31) (73) (121) (222)        
Retirement obligation (105) (122) (159) (390)        
Total 2,650 (1,030) 7,660 (4,532)        
Transactions Net of tax                
Unrealized gain (loss) on investment securities (10,185) 1,501 (28,993) 7,064        
Unrealized gain (loss) on derivatives 99 129 414 385        
Retirement obligation 347 213 1,164 615        
Total (9,739) 1,843 (27,415) 8,064        
Stranded Tax Effects                
Unrealized gain (loss) on investment securities     (189)          
Unrealized gain (loss) on Derivatives     (124)          
Retirement obligation     (4,779)          
Total     (5,092)          
Balances Net of tax                
Unrealized gain (loss) on investment securities (29,364) 2,515 (29,364) 2,515 $ (19,179) $ (182) $ 1,014 $ (4,549)
Unrealized gain (loss) on cash flow hedges (287) (706) (287) (706) (386) (577) (835) (1,091)
Retirement obligation (23,246) (22,188) (23,246) (22,188) (23,593) (19,631) (22,401) (22,803)
Total $ (52,897) $ (20,379) (52,897) (20,379) $ (43,158) $ (20,390) $ (22,222) $ (28,443)
Accumulated other comprehensive income (loss)                
Transactions Net of tax                
Total     $ (27,415) $ 8,064