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COMPREHENSIVE INCOME - Components (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
COMPREHENSIVE INCOME        
Unrealized holding income (losses) on available-for-sale debt securities $ 2,941 $ 2,835 $ (3,173) $ 10,075
Unrealized holding income (losses) on available-for-sale debt securities, Income Tax Effect (619) (593) 666 (2,114)
Unrealized holding income (losses) on available-for-sale debt securities, Net of Tax Amount 2,322 2,242 (2,507) 7,961
Reclassification adjustment for gains realized in income, Before-Tax Amount (2) 0 (2) 0
Reclassification adjustment for (gains) realized in income, Income Tax Effect 0   0  
Reclassification adjustment for (gains) realized in income. Net of Tax Amount (2)   (2)  
Unrealized holding gains on available-for-sale debt securities, Before-Tax Amount 2,939 2,835 (3,175) 10,075
Other comprehensive income on available-for-sale debt securities, income tax effect (619)   666  
Unrealized holding gains on available-for-sale debt securities, Net-of-Tax Amount 2,320   (2,509)  
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 (4) (6) (8) (14)
Amortization of prior service cost and net actuarial loss included in net periodic benefit cost, Income Tax Effect 1 1 2 3
Amortization of prior service cost and net actuarial loss included in net periodic benefit cost, Net-of-Tax Amount (3) (5) (6) (11)
Other comprehensive (loss) income on unfunded retirement obligations (4) (6) (13) 74
Other comprehensive income (loss) on unfunded retirement obligations, Income Tax Effect 1   3 (15)
Other comprehensive income (loss) on unfunded retirement obligations, Net-of-Tax Amount (3)   (10) 59
Other comprehensive income (loss) before income tax 2,935 2,829 (3,188) 10,149
Total other comprehensive income (loss), Income Tax Effect (618) (592) 669 (2,129)
Total other comprehensive income (loss) $ 2,317 $ 2,237 $ (2,519) $ 8,020