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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Other Comprehensive Income (Loss), before Reclassification Adjustments and Tax [Abstract]                
Unrealized gain (loss) on investment securities $ 31,144 $ (11,456) $ 60,869 $ (23,992)        
Unrealized gain (loss) on derivatives 94 203 187 405        
Retirement obligation 0 0 0 0        
Total 31,238 (11,253) 61,056 (23,587)        
Other Comprehensive Income (Loss) Reclassifications before Tax [Abstract]                
Realized gain (loss) on securities available-for-sale (37) (30) (215) (30)        
Unrealized gain (loss) on derivatives 0 0 0 0        
Retirement obligation (320) (452) (695) (871)        
Total (357) (482) (910) (901)        
Transactions Pre-tax                
Unrealized gain (loss) on investment securities 31,181 (11,426) 61,084 (23,962)        
Unrealized gain (loss) on derivatives 94 203 187 405        
Unfunded pension obligation 320 452 695 871        
Total 31,595 (10,771) 61,966 (22,686)        
Transactions Tax-effect                
Unrealized gain (loss) on investment securities (6,671) 2,448 (13,069) 5,154        
Unrealized gain (loss) on derivatives (22) (44) (43) (90)        
Retirement obligation (74) 42 (159) (54)        
Total (6,767) 2,446 (13,271) 5,010        
Transactions Net of tax                
Unrealized gain (loss) on investment securities 24,510 (8,978) 48,015 (18,808)        
Unrealized gain (loss) on derivatives 72 159 144 315        
Retirement obligation 246 494 536 817        
Total 24,828 (8,325) 48,695 (17,676)        
Cumulative effect of new standard                
Unrealized gain (loss) on investment 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 investment securities 37,320 (19,180) 37,320 (19,180) $ 12,810 $ (11,601) $ (10,202) $ (182)
Unrealized gain (loss) on cash flow hedges (73) (386) (73) (386) (145) (217) (545) (577)
Retirement obligation (32,054) (23,593) (32,054) (23,593) (32,300) (32,590) (24,087) (19,631)
Total 5,193 (43,159) 5,193 (43,159) $ (19,635) $ (44,408) $ (34,834) $ (20,390)
Accumulated other comprehensive income (loss)                
Transactions Net of tax                
Total $ 24,828 $ (8,325) $ 48,695 $ (17,676)