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COMPREHENSIVE INCOME - Components (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
COMPREHENSIVE INCOME    
Unrealized holding income (losses) on available-for-sale debt securities $ (6,114) $ 7,240
Unrealized holding income (losses) on available-for-sale debt securities, Income Tax Effect 1,285 (1,521)
Unrealized holding income (losses) on available-for-sale debt securities, Net of Tax Amount (4,829) 5,719
Changes from plan amendments and actuarial gains and losses, Before-Tax Amount (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 (4) (8)
Amortization of prior service cost and net actuarial loss included in net periodic benefit cost, Income Tax Effect 1 2
Amortization of prior service cost and net actuarial loss included in net periodic benefit cost, Net-of-Tax Amount (3) (6)
Other comprehensive (loss) income on unfunded retirement obligations (9) 80
Other comprehensive income (loss) on unfunded retirement obligations, Income Tax Effect 2 (16)
Other comprehensive income (loss) on unfunded retirement obligations, Net-of-Tax Amount (7) 64
Other comprehensive (loss) income before income tax (6,123) 7,320
Total other comprehensive income (loss), Income Tax Effect 1,287 (1,537)
Total other comprehensive income (loss) $ (4,836) $ 5,783