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COMPREHENSIVE INCOME - Components (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
COMPREHENSIVE INCOME    
Unrealized holding gains on available-for-sale debt securities $ 10,504 $ 9,920
Unrealized holding gains on available-for-sale debt securities, Income Tax Effect (2,205) (2,084)
Unrealized holding gains on available-for-sale debt securities, Net of Tax Amount 8,299 7,836
Reclassification adjustment for gains realized in income, Before-Tax Amount (169) (23)
Reclassification adjustment for (gains) realized in income, Income Tax Effect 35 5
Reclassification adjustment for (gains) realized in income. Net of Tax Amount (134) 18
Unrealized holding gains on available-for-sale debt securities, Before-Tax Amount 10,335 9,897
Other comprehensive income on available-for-sale debt securities, income tax effect (2,170) (2,079)
Unrealized holding gains on available-for-sale debt securities, Net-of-Tax Amount 8,165 7,818
Changes from plan amendments and actuarial gains and losses, Before-Tax Amount (49) 87
Changes from plan amendments and actuarial gains and losses, Income Tax Effect 11 (19)
Changes from plan amendments and actuarial gains and losses, Net-of-Tax Amount (38) 68
Amortization of prior service cost and net actuarial gain included in net periodic benefit cost, Before-Tax Amount (29) (32)
Amortization of prior service cost and net actuarial gain included in net periodic benefit cost, Income Tax Effect 6 7
Amortization of prior service cost and net actuarial gain included in net periodic benefit cost, Net-of-Tax Amount (23) (25)
Other comprehensive (loss) income on unfunded retirement obligations (78) 55
Other comprehensive income (loss) on unfunded retirement obligations, Income Tax Effect 17 (12)
Other comprehensive income (loss) on unfunded retirement obligations, Net-of-Tax Amount (61) 43
Other comprehensive income before income tax 10,257 9,952
Total other comprehensive income (loss), Income Tax Effect (2,153) (2,091)
Total other comprehensive income $ 8,104 $ 7,861