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INCOME TAXES: (Details 2) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Other than temporary impairment | $ 753 | $ 754
Net unrealized losses on retirement plans | 8,132 | 7,465
Loan loss provisions | 12,150 | 5,288
Deferred compensation | 2,496 | 2,615
Compensated absences | 623 | 611
Post-retirement benefits | 1,286 | 1,309
Deferred loss on acquisition | 0 | 482
Other | 2,186 | 2,161
GROSS DEFERRED ASSETS | 30,136 | 23,788
Deferred tax liabilities: |  |
Net unrealized gains on securities available-for-sale | (8,752) | (4,248)
Depreciation | (2,155) | (2,376)
Mortgage servicing rights | (390) | (332)
Pensions | (843) | (475)
Intangibles | (5,458) | (3,285)
Other | (3,963) | (2,827)
GROSS DEFERRED LIABILITIES | (23,118) | (15,044)
NET DEFERRED TAX ASSETS (LIABILITIES) | $ 7,018 | $ 8,744

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