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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Before Tax |  |  |  |  |  |  |  |
Other comprehensive income (loss), before tax | $ 6,310 |  |  | $ (7,999) |  |  | $ 38,499 | $ (32,917)
Tax Effect |  |  |  |  |  |  |  |
Other comprehensive income, tax | 1,641 |  |  | (2,144) |  |  | 10,179 | (8,828)
Net of Tax |  |  |  |  |  |  |  |
Total other comprehensive income (loss), net of tax | 4,669 | $ 12,413 | $ 11,238 | (5,855) | $ (3,519) | $ (14,715) | 28,320 | (24,089)
Net unrealized gains on investment securities |  |  |  |  |  |  |  |
Before Tax |  |  |  |  |  |  |  |
Other comprehensive income (loss) before reclassification, before tax | 6,027 |  |  | (8,297) |  |  | 37,671 | (33,809)
Reclassification from AOCI, before tax | (36) |  |  | 0 |  |  | (36) | 0
Other comprehensive income (loss), before tax | 5,991 |  |  | (8,297) |  |  | 37,635 | (33,809)
Tax Effect |  |  |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications, tax | 1,615 |  |  | (2,225) |  |  | 10,098 | (9,097)
Reclassification from AOCI, tax | (10) |  |  | 0 |  |  | (10) | 0
Other comprehensive income, tax | 1,605 |  |  | (2,225) |  |  | 10,088 | (9,097)
Net of Tax |  |  |  |  |  |  |  |
Other comprehensive income (loss), before reclassifications, net of tax | 4,412 |  |  | (6,072) |  |  | 27,573 | (24,712)
Reclassification from AOCI, net of tax | (26) |  |  | 0 |  |  | (26) | 0
Total other comprehensive income (loss), net of tax | 4,386 |  |  | (6,072) |  |  | 27,547 | (24,712)
Amortization of net actuarial loss |  |  |  |  |  |  |  |
Before Tax |  |  |  |  |  |  |  |
Reclassification from AOCI, before tax | 310 |  |  | 289 |  |  | 837 | 865
Tax Effect |  |  |  |  |  |  |  |
Reclassification from AOCI, tax | 31 |  |  | 78 |  |  | 84 | 262
Net of Tax |  |  |  |  |  |  |  |
Reclassification from AOCI, net of tax | 279 |  |  | 211 |  |  | 753 | 603
Amortization of net transition obligation |  |  |  |  |  |  |  |
Before Tax |  |  |  |  |  |  |  |
Reclassification from AOCI, before tax | 5 |  |  | 5 |  |  | 14 | 14
Tax Effect |  |  |  |  |  |  |  |
Reclassification from AOCI, tax | 3 |  |  | 2 |  |  | 4 | 4
Net of Tax |  |  |  |  |  |  |  |
Reclassification from AOCI, net of tax | 2 |  |  | 3 |  |  | 10 | 10
Amortization of prior service cost |  |  |  |  |  |  |  |
Before Tax |  |  |  |  |  |  |  |
Reclassification from AOCI, before tax | 4 |  |  | 4 |  |  | 13 | 13
Tax Effect |  |  |  |  |  |  |  |
Reclassification from AOCI, tax | 2 |  |  | 1 |  |  | 3 | 3
Net of Tax |  |  |  |  |  |  |  |
Reclassification from AOCI, net of tax | 2 |  |  | 3 |  |  | 10 | 10
Defined benefit plans, net |  |  |  |  |  |  |  |
Before Tax |  |  |  |  |  |  |  |
Other comprehensive income (loss), before tax | (319) |  |  | (298) |  |  | (864) | (892)
Tax Effect |  |  |  |  |  |  |  |
Other comprehensive income, tax | (36) |  |  | (81) |  |  | (91) | (269)
Net of Tax |  |  |  |  |  |  |  |
Other comprehensive income (loss), before reclassifications, net of tax | 0 |  |  | 0 |  |  | 0 | 0
Reclassification from AOCI, net of tax | 283 |  |  | 217 |  |  | 773 | 623
Total other comprehensive income (loss), net of tax | $ 283 |  |  | $ 217 |  |  | $ 773 | $ 623

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