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COMPREHENSIVE INCOME - Components (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
COMPREHENSIVE INCOME        
Unrealized holding income (losses) on available-for-sale debt securities $ (3,608) $ (95) $ (6,781) $ 9,980
Unrealized holding income (losses) on available-for-sale debt securities, Income Tax Effect 759 19 1,425 (2,095)
Unrealized holding income (losses) on available-for-sale debt securities, Net of Tax Amount (2,849) (76) (5,356) 7,885
Reclassification adjustment for gains realized in income, Before-Tax Amount (23) (25) (25) (25)
Reclassification adjustment for (gains) realized in income, Income Tax Effect 5 5 5 5
Reclassification adjustment for (gains) realized in income. Net of Tax Amount (18) (20) (20) (20)
Other comprehensive loss from available-for-sale debt securities, Before-Tax Amount (3,631) (120) (6,806) 9,955
Other comprehensive income on available-for-sale debt securities, income tax effect 764 24 1,430 (2,090)
Other comprehensive loss from available-for-sale debt securities, Net-of-Tax Amount (2,867) (96) (5,376) 7,865
Changes from plan amendments and actuarial gains and losses, Before-Tax Amount 0 0 (5) 88
Changes from plan amendments and actuarial gains and losses, Income Tax Effect     1 (18)
Changes from plan amendments and actuarial gains and losses, Net-of-Tax Amount     (4) 70
Amortization of prior service cost and net actuarial loss included in net periodic benefit cost, Before-Tax Amount (5) (8) (13) (22)
Amortization of prior service cost and net actuarial loss included in net periodic benefit cost, Income Tax Effect 1 2 3 5
Amortization of prior service cost and net actuarial loss included in net periodic benefit cost, Net-of-Tax Amount (4) (6) (10) (17)
Other comprehensive (loss) income on unfunded retirement obligations (5) (8) (18) 66
Other comprehensive income (loss) on unfunded retirement obligations, Income Tax Effect     4 (13)
Other comprehensive income (loss) on unfunded retirement obligations, Net-of-Tax Amount     (14) 53
Other comprehensive (loss) income before income tax (3,636) (128) (6,824) 10,021
Total other comprehensive income (loss), Income Tax Effect 765 26 1,434 (2,103)
Total other comprehensive income (loss) $ (2,871) $ (102) $ (5,390) $ 7,918