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ACCUMULATED OTHER COMPREHENSIVE INCOME AMOUNT RECLASSIFIED FROM ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Realized gains and losses on securities available for sale $ (370) $ (161) $ 1,649
Amortization of prior service cost 413 413 413
Recognized net actuarial loss (1,803) (2,188) (1,924)
Other Comprehensive Income, Reclassification, Amortization of Defined Benefit Plans items, Pre-tax (1,390) (1,775) (1,511)
Total reclassifications for the period, before tax $ (1,760) $ (1,936) $ 138