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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Before Tax |  |
Other comprehensive income (loss), before tax | $ (23,368) | $ 14,562
Tax Effect |  |
Other comprehensive income, tax | (6,251) | 3,899
Net of Tax |  |
Total other comprehensive (loss) income, net of tax | (17,117) | 10,663
Net unrealized gains on investment securities |  |
Before Tax |  |
Other comprehensive income (loss) before reclassification, before tax | (23,619) | 13,858
Reclassification from AOCI, before tax | 0 | 0
Other comprehensive income (loss), before tax | (23,619) | 13,858
Tax Effect |  |
Other comprehensive income (loss) before reclassifications, tax | (6,318) | 3,711
Reclassification from AOCI, tax | 0 | 0
Other comprehensive income, tax | (6,318) | 3,711
Net of Tax |  |
Other comprehensive income (loss), before reclassifications, net of tax | (17,301) | 10,147
Reclassification from AOCI, net of tax | 0 | 0
Total other comprehensive (loss) income, net of tax | (17,301) | 10,147
Net actuarial losses 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 | 246 | 268
Tax Effect |  |
Reclassification from AOCI, tax | 66 | 72
Net of Tax |  |
Reclassification from AOCI, net of tax | 180 | 196
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
Tax Effect |  |
Reclassification from AOCI, tax |  | 1
Net of Tax |  |
Reclassification from AOCI, net of tax |  | 3
Defined benefit plans, net |  |
Before Tax |  |
Other comprehensive income (loss), before tax | (251) | (704)
Tax Effect |  |
Other comprehensive income, tax | (67) | (188)
Net of Tax |  |
Other comprehensive income (loss), before reclassifications, net of tax | 0 | 313
Reclassification from AOCI, net of tax | 184 | 203
Total other comprehensive (loss) income, net of tax | $ 184 | $ 516

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