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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Reclassifications (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net securities gains $ 49 $ 65 $ 49 $ 88
Other expense 1,768 2,321 4,080 4,898
Income tax expense 4,448 5,409 8,091 9,788
Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net income 2 27 (45) 11
Reclassification out of Accumulated Other Comprehensive Income [Member] | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net securities gains 49 65 49 88
Income tax expense 0 0 0 0
Net income 49 65 49 88
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other expense 63 (53) (126) 103
Income tax expense (16) 15 32 (26)
Net income $ (47) $ (38) $ (94) $ (77)