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INCOME TAXES: (Details 2) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets: |  |
Other than temporary impairment | $ 761 | $ 1,829
Net unrealized losses on retirement plans | 5,783 | 6,609
Net unrealized losses on securities available for sale | 2,063 | 0
Loan loss provisions | 5,463 | 5,195
Deferred compensation | 2,883 | 3,661
Compensated absences | 576 | 563
Post-retirement benefits | 1,338 | 1,359
Deferred loss on acquisition | 577 | 663
Other | 2,140 | 2,123
GROSS DEFERRED ASSETS | 21,584 | 22,002
Deferred tax liabilities: |  |
Net unrealized gains on securities available-for-sale | 0 | (804)
Depreciation | (2,004) | (1,989)
Mortgage servicing rights | (319) | (308)
Pensions | (335) | (201)
Intangibles | (2,852) | (2,446)
Other | (2,614) | (2,408)
GROSS DEFERRED LIABILITIES | (8,124) | (8,156)
NET DEFERRED TAX ASSETS (LIABILITIES) | $ 13,460 | $ 13,846

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