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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Other Comprehensive Income (Loss), before Reclassification Adjustments and Tax [Abstract]                
Unrealized gain (loss) on investment securities $ 12,719 $ (13,138) $ 73,588 $ (37,130)        
Unrealized gain (loss) on derivatives 94 130 281 535        
Retirement obligation 0 0 0 0        
Total 12,813 (13,008) 73,869 (36,595)        
Other Comprehensive Income (Loss) Reclassifications before Tax [Abstract]                
Realized gain (loss) on securities available-for-sale 105 (167) (110) (197)        
Unrealized gain (loss) on derivatives 0 0 0 0        
Retirement obligation (347) (452) (1,042) (1,323)        
Total (242) (619) (1,152) (1,520)        
Transactions Pre-tax                
Unrealized gain (loss) on investment securities 12,614 (12,971) 73,698 (36,933)        
Unrealized gain (loss) on derivatives 94 130 281 535        
Unfunded pension obligation 347 452 1,042 1,323        
Total 13,055 (12,389) 75,021 (35,075)        
Transactions Tax-effect                
Unrealized gain (loss) on investment securities (2,699) 2,786 (15,768) 7,940        
Unrealized gain (loss) on derivatives (21) (31) (64) (121)        
Retirement obligation (78) (105) (237) (159)        
Total (2,798) 2,650 (16,069) 7,660        
Transactions Net of tax                
Unrealized gain (loss) on investment securities 9,915 (10,185) 57,930 (28,993)        
Unrealized gain (loss) on derivatives 73 99 217 414        
Retirement obligation 269 347 805 1,164        
Total 10,257 (9,739) 58,952 (27,415)        
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect       (5,092)        
Cumulative effect of new standard                
Unrealized gain (loss) on investment securities     906 (189)        
Unrealized gain (loss) on Derivatives     0 (124)        
Retirement obligation     0 (4,779)        
Balances Net of tax                
Unrealized gain (loss) on investment securities 47,235 (29,364) 47,235 (29,364) $ 37,320 $ (11,601) $ (19,179) $ (182)
Unrealized gain (loss) on cash flow hedges 0 (287) 0 (287) (73) (217) (386) (577)
Retirement obligation (31,785) (23,246) (31,785) (23,246) (32,054) (32,590) (23,593) (19,631)
Total 15,450 (52,897) 15,450 (52,897) $ 5,193 $ (44,408) $ (43,158) $ (20,390)
Accumulated other comprehensive income (loss)                
Transactions Net of tax                
Total $ 10,257 $ (9,739) $ 58,952 $ (27,415)