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Income Taxes (Details 2) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets: |  |
Allowance for credit losses | $ 2,525 | $ 3,621
Net unrealized loss on securities available for sale | 0 | 1,522
Deferred and accrued compensation | 981 | 1,922
Deferred loan fees and costs | 517 | 729
Post-retirement benefits | 0 | 25
Nonaccrual loan interest income | 416 | 306
Other-than-temporary impairment | 25 | 196
Restricted stock | 647 | 509
AMT credit carryforward | 64 | 205
Other | 73 | 106
Gross deferred tax assets | 5,248 | 9,141
Deferred tax liabilities: |  |
Depreciation and amortization | (448) | (740)
Net unrealized gain on securities available for sale | (159) | 0
Federal Home Loan Bank dividends | (656) | (1,093)
Purchase accounting adjustments | (744) | (1,559)
Mortgage servicing rights | (261) | (299)
Prepaid expenses | (277) | (271)
Other | (8) | (15)
Gross deferred tax liabilities | (2,553) | (3,977)
NET DEFERRED TAX ASSET | $ 2,695 | $ 5,164

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