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Income Taxes - Components of Net Deferred Tax Asset (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets: |  |
Allowance for loan losses | $ 2,840 | $ 4,679
Fair value adjustments - business combination | 1,135 | 2,530
Deferred compensation | 1,903 | 2,891
Impaired security valuation | 0 | 379
Net operating loss carryover | 71 | 627
Post-retirement benefits | 892 | 1,688
Unrealized loss on interest rate swap | 34 | 161
Nonaccrual loan interest | 390 | 649
Accrued expenses | 699 | 1,282
Deferred fees and costs | 598 | 629
Other | 344 | 465
Deferred tax assets | 8,906 | 15,980
Deferred tax liabilities: |  |
Unrealized gain on securities available for sale | 126 | 750
Premises and equipment | 1,413 | 2,258
Unrealized gain on trading securities | 156 | 118
Intangibles - section 197 | 2,593 | 4,735
Mortgage servicing rights | 291 | 487
Other | 78 | 23
Deferred tax liabilities | 4,657 | 8,371
Net deferred tax asset | $ 4,249 | $ 7,609

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