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ACCUMULATED OTHER COMPREHENSIVE INCOME AMOUNT RECLASSIFIED FROM ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Realized gains and losses on securities available for sale | $ (4,563) | $ (370) | $ (161)
Amortization of prior service cost | 413 | 413 | 413
Recognized net actuarial loss | (2,334) | (1,803) | (2,188)
Other Comprehensive Income, Reclassification, Amortization of Defined Benefit Plans items, Pre-tax | (1,921) | (1,390) | (1,775)
Total reclassifications for the period, before tax | $ (6,484) | $ (1,760) | $ (1,936)

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- Definition Amount of unrealized and realized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity), investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References No definition available. + Details
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