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Income Taxes - Components of Net Deferred Tax Asset (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets: |  |
Allowance for loan losses | $ 3,088 | $ 2,840
Fair value adjustments – business combination | 966 | 1,135
Deferred compensation | 2,056 | 1,903
Net operating loss carryover | 0 | 71
Post-retirement benefits | 836 | 892
Unrealized loss on interest rate swap | 42 | 34
Nonaccrual loan interest | 589 | 390
Accrued expenses | 1,254 | 699
Deferred fees and costs | 588 | 598
Unrealized loss on securities available for sale | 940 | 0
Other | 366 | 344
Deferred tax assets | 10,725 | 8,906
Deferred tax liabilities: |  |
Unrealized gain on securities available for sale | 0 | 126
Premises and equipment | 1,459 | 1,413
Unrealized gain on trading securities | 63 | 156
Intangibles – section 197 | 2,414 | 2,593
Mortgage servicing rights | 314 | 291
Other | 178 | 78
Deferred tax liabilities | 4,428 | 4,657
Net deferred tax asset | $ 6,297 | $ 4,249

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