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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Before Tax |  |
Other comprehensive income (loss), before tax | $ 14,562 | $ 15,297
Tax Effect |  |
Other comprehensive income, tax | 3,899 | 4,059
Net of Tax |  |
Total other comprehensive income, net of tax | 10,663 | 11,238
Net unrealized gains on investment securities |  |
Before Tax |  |
Other comprehensive income (loss) before reclassification, before tax | 13,858 | 15,024
Reclassification from AOCI, before tax | 0 | 0
Other comprehensive income (loss), before tax | 13,858 | 15,024
Tax Effect |  |
Other comprehensive income (loss) before reclassifications, tax | 3,711 | 4,028
Reclassification from AOCI, tax | 0 | 0
Other comprehensive income, tax | 3,711 | 4,028
Net of Tax |  |
Other comprehensive income (loss), before reclassifications, net of tax | 10,147 | 10,996
Reclassification from AOCI, net of tax | 0 | 0
Total other comprehensive income, net of tax | 10,147 | 10,996
Net actuarial gains arising during the period |  |
Before Tax |  |
Reclassification from AOCI, before tax | 427 |
Tax Effect |  |
Reclassification from AOCI, tax | 114 |
Net of Tax |  |
Reclassification from AOCI, net of tax | 313 |
Amortization of net actuarial loss |  |
Before Tax |  |
Reclassification from AOCI, before tax | 268 | 263
Tax Effect |  |
Reclassification from AOCI, tax | 72 | 29
Net of Tax |  |
Reclassification from AOCI, net of tax | 196 | 234
Amortization of net transition obligation |  |
Before Tax |  |
Reclassification from AOCI, before tax | 5 | 5
Tax Effect |  |
Reclassification from AOCI, tax | 1 | 1
Net of Tax |  |
Reclassification from AOCI, net of tax | 4 | 4
Amortization of prior service cost |  |
Before Tax |  |
Reclassification from AOCI, before tax | 4 | 5
Tax Effect |  |
Reclassification from AOCI, tax | 1 | 1
Net of Tax |  |
Reclassification from AOCI, net of tax | 3 | 4
Defined benefit plans, net |  |
Before Tax |  |
Other comprehensive income (loss), before tax | (704) | (273)
Tax Effect |  |
Other comprehensive income, tax | (188) | (31)
Net of Tax |  |
Other comprehensive income (loss), before reclassifications, net of tax | 313 | 0
Reclassification from AOCI, net of tax | 203 | 242
Total other comprehensive income, net of tax | $ 516 | $ 242

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