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Income Taxes - Components of Net Deferred Tax Asset (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred tax assets: |  |
Allowance for loan losses | $ 4,679 | $ 4,799
Fair value adjustments - business combination | 2,530 | 1,661
Deferred compensation | 2,891 | 2,443
Impaired security valuation | 261 | 497
Net operating loss carryover | 627 | 1,137
Post-retirement benefits | 1,688 | 1,562
Unrealized loss on interest rate swap | 161 | 258
Nonaccrual loan interest | 649 | 762
Accrued expenses | 1,282 | 1,072
Deferred fees and costs | 629 | 388
Other | 465 | 442
Deferred tax assets | 15,862 | 15,021
Deferred tax liabilities: |  |
Unrealized gain on securities available for sale | 750 | 1,900
Premises and equipment | 2,258 | 1,737
Intangibles - section 197 | 4,735 | 4,558
Mortgage servicing rights | 487 | 337
Other | 23 | 19
Deferred tax liabilities | 8,253 | 8,551
Net deferred tax asset | $ 7,609 | $ 6,470

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