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Income Taxes - Components of Net Deferred Tax Asset (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Deferred tax assets: |  |
Allowance for loan losses | $ 4,799 | $ 5,076
Fair value adjustments - business combination | 1,661 | 2,466
Deferred compensation | 2,443 | 2,238
Impaired security valuation | 497 | 479
Net operating loss carryover | 1,137 | 1,646
Post-retirement benefits | 1,562 | 1,423
Unrealized loss on interest rate swap | 258 | 331
Nonaccrual loan interest | 762 | 598
Accrued expenses | 1,072 | 974
Deferred fees and costs | 388 | 40
Other | 442 | 351
Deferred tax assets | 5,021 | 15,622
Deferred tax liabilities: |  |
Unrealized gain on securities available for sale | 1,900 | 1,474
Premises and equipment | 1,737 | 1,528
Intangibles - section 197 | 4,558 | 4,900
Mortgage servicing rights | 337 | 299
Other | 19 | 124
Deferred tax liabilities | 8,551 | 8,325
Net deferred tax asset | $ 6,470 | $ 7,297

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