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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Other Comprehensive Income (Loss), before Reclassification Adjustments and Tax [Abstract] |  |  |  |
Unrealized gain (loss) on debt securities | $ 65,858 | $ (14,461) | $ 8,447 |
Unrealized gain (loss) on derivatives | 281 | 628 | 810 |
Retirement obligations | 4,630 | (12,319) | 2,775 |
Total | 70,769 | (26,152) | 12,032 |
Other Comprehensive Income (Loss) Reclassifications before Tax [Abstract] |  |  |  |
Unrealized gain (loss) on debt securities | (370) | (161) | 1,649 |
Unrealized gain (loss) on derivatives | 0 | 0 | 0 |
Retirement obligation | 1,390 | 1,775 | 1,511 |
Total | (1,760) | (1,936) | 138 |
Transactions Pre-tax |  |  |  |
Unrealized gain (loss) on debt securities | 66,228 | (14,300) | 6,798 |
Unrealized gain (loss) on derivatives | 281 | 628 | 810 |
Retirement obligation | 6,020 | (10,544) | 4,286 |
Total | 72,529 | (24,216) | 11,894 |
Transactions Tax-effect |  |  |  |
Unrealized gain (loss) on debt securities | (14,269) | 3,071 | (2,431) |
Unrealized gain (loss) on derivatives | (64) | (144) | (296) |
Retirement obligation | (1,371) | 2,364 | (1,114) |
Total | (15,704) | 5,291 | (3,841) |
Transactions Net of tax |  |  |  |
Unrealized gain (loss) on debt securities | 51,959 | (11,229) | 4,367 |
Unrealized gain (loss) on derivatives | 217 | 484 | 514 |
Retirement obligation | 4,649 | (8,180) | 3,172 |
Total | 56,825 | (18,925) | 8,053 |
Cumulative effect of accounting change |  |  |  |
Unrealized gain (loss) on debt securities | 906 | (190) |  |
Unrealized gain (loss) on derivatives | 0 | (124) |  |
Retirement obligation | 0 | (4,779) |  |
Total | 906 | (5,093) |  |
Balances Net of tax |  |  |  |
Unrealized gain (loss) on debt securities | 41,264 | (11,601) | (182) | $ (4,549)
Unrealized gain (loss) on derivatives | 0 | (217) | (577) | (1,091)
Retirement obligation | (27,941) | (32,590) | (19,631) | (22,803)
Total | $ 13,323 | $ (44,408) | $ (20,390) | $ (28,443)

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