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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Other Comprehensive Income (Loss), before Reclassification Adjustments and Tax [Abstract] |  |  |  |
Unrealized gain (loss) on debt securities | $ (14,461) | $ 8,447 | $ 751 |
Unrealized gain (loss) on derivatives | 628 | 810 | 809 |
Retirement obligations | (12,319) | 2,775 | 884 |
Total | (26,152) | 12,032 | 2,444 |
Other Comprehensive Income (Loss) Reclassifications before Tax [Abstract] |  |  |  |
Unrealized gain (loss) on debt securities | (161) | 1,649 | 234 |
Unrealized gain (loss) on derivatives | 0 | 0 | 0 |
Retirement obligation | 1,775 | 1,511 | 1,195 |
Total | (1,936) | 138 | (961) |
Transactions Pre-tax |  |  |  |
Unrealized gain (loss) on debt securities | (14,300) | 6,798 | 517 |
Unrealized gain (loss) on derivatives | 628 | 810 | 809 |
Retirement obligation | (10,544) | 4,286 | 2,079 |
Total | (24,216) | 11,894 | 3,405 |
Transactions Tax-effect |  |  |  |
Unrealized gain (loss) on debt securities | 3,071 | (2,431) | (133) |
Unrealized gain (loss) on derivatives | (144) | (296) | (301) |
Retirement obligation | 2,364 | (1,114) | (834) |
Total | 5,291 | (3,841) | (1,268) |
Transactions Net of tax |  |  |  |
Unrealized gain (loss) on debt securities | (11,229) | 4,367 | 384 |
Unrealized gain (loss) on derivatives | 484 | 514 | 508 |
Retirement obligation | (8,180) | 3,172 | 1,245 |
Total | (18,925) | 8,053 | 2,137 |
Cumulative effect of accounting change |  |  |  |
Unrealized gain (loss) on debt securities | (190) |  |  |
Unrealized gain (loss) on derivatives | (124) |  |  |
Retirement obligation | (4,779) |  |  |
Total | (5,093) |  |  |
Balances Net of tax |  |  |  |
Unrealized gain (loss) on debt securities | (11,601) | (182) | (4,549) | $ (4,933)
Unrealized gain (loss) on derivatives | (217) | (577) | (1,091) | (1,599)
Retirement obligation | (32,590) | (19,631) | (22,803) | (24,048)
Total | $ (44,408) | $ (20,390) | $ (28,443) | $ (30,580)

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