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Income Taxes (Schedule of tax effects of temporary differences of the deferred tax assets and deferred tax liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Allowance for loan losses | $ 1,608 | $ 1,794
Deferred expenses | 937 | 783
Unrecognized pension liability | 1,038 | 1,179
Postretirement liability | 932 | 914
Deferred loss on OREO | 187 | 187
Unrealized loss on securities | 53 | 685
State tax NOLs | 870 | 779
Other | 201 | 134
Gross deferred tax assets | 5,826 | 6,455
Deferred tax liabilities: |  |
Prepaid expenses | (209) | (241)
Prepaid pension | (1,248) | (1,305)
Deferred loan fees | (207) | (170)
Depreciation and amortization | (104) | (105)
Mortgage servicing rights | (601) | (615)
Gross deferred tax liabilities | (2,369) | (2,436)
Net deferred tax asset | 3,457 | 4,019
Deferred tax valuation allowance | (1,202) | (1,085)
Deferred tax assets, net of allowance | $ 2,255 | $ 2,934

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