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COMPREHENSIVE INCOME - Components of Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
COMPREHENSIVE INCOME        
Unrealized holding gains on available-for-sale debt securities $ 2,835 $ 5,170 $ 10,075 $ 9,431
Unrealized holding gains on available-for-sale debt securities, income tax effect (593) (1,085) (2,114) (1,980)
Unrealized holding gains on available-for-sale debt securities,Net of Tax Amount 2,242 4,085 7,961 7,451
Reclassification adjustment for (gains) realized in income   (7)   (7)
Reclassification adjustment for (gains) realized in income, Income Tax Effect   1   1
Reclassification adjustment for (gains) realized in income. Net of Tax Amount   (6)   (6)
Other comprehensive income on available-for-sale debt securities   5,163   9,424
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax, Portion Attributable to Parent   (1,084)   (1,979)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent   4,079   7,445
Changes from plan amendments and actuarial gains and losses, before tax amount 0 0 88 214
Changes from plan amendments and actuarial gains and losses, income tax effect     (18) (45)
Changes from plan amendments and actuarial gains and losses, net of tax amount     70 169
Amortization of prior service cost and net actuarial gain included in net periodic benefit cost, before tax amount (6) (7) (14) (15)
Amortization of prior service cost and net actuarial gain included in net periodic benefit cost, income tax effect 1 1 3 3
Amortization of prior service cost and net actuarial gain included in net periodic benefit cost, net of tax amount (5) (6) (11) (12)
Other comprehensive (loss) gain on unfunded retirement obligations (6) (7) 74 199
Other comprehensive income (loss) on unfunded retirement obligations, income tax effect (592) 1 (15) (42)
Other comprehensive income (loss) on unfunded retirement obligations, net of tax amount 2,237 (6) 59 157
Total other comprehensive income, before tax amount (2,829) (5,156) (10,149) (9,623)
Total other comprehensive income (loss), income tax effect (592) (1,083) (2,129) (2,021)
Total other comprehensive income, net of tax amount $ 2,237 $ 4,073 $ 8,020 $ 7,602