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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets |  |
Federal net operating loss carryforwards | $ 7,180 | $ 13,669
State net operating loss carryforwards | 1,338 | 1,493
Acquired loan basis | 1,159 | 4,888
Other real estate owned | 394 | 2,788
AMT credit carryforward | 2,855 | 2,855
Allowance for loan losses | 4,825 | 4,853
Unrealized loss on securities available for sale | 176 | 163
Other | 1,218 | 2,562
Total deferred tax assets | 19,145 | 33,271
Deferred tax liabilities |  |
Goodwill and intangible assets | 2,233 | 4,558
Fair value adjustment on junior subordinated debentures | 2,792 | 4,735
Premises and equipment | 2,273 | 3,310
Installment gain on sale of subsidiary | 2,230 |
Other | 396 | 1,606
Total deferred tax liabilities | 9,924 | 14,209
Net deferred tax asset before valuation allowance | 9,221 | 19,062
Valuation allowance | (262) | (237)
Net deferred tax asset | $ 8,959 | $ 18,825

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