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Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets |  |
Allowance for loan losses | $ 3,245 | $ 3,056
Deferred compensation | 1,191 | 1,217
Pension costs | 81 |
Intangible assets | 394 | 475
Purchase accounting adjustments | 226 | 566
Net operating loss carryforward | 1,081 | 1,374
Other | 220 | 364
Deferred tax asset | 6,438 | 7,052
Deferred tax liabilities |  |
Tax depreciation in excess of book depreciation | (808) | (556)
Discount accretion on securities | (18) | (31)
FHLB stock dividends | (969) | (1,053)
Unrealized gain on securities available for sale | (3,424) | (624)
Pension costs |  | (469)
Prepaids | (326) | (301)
BOLI |  | (337)
Other | (359) | (271)
Deferred tax liability | (5,904) | (3,642)
Net deferred tax asset | $ 534 | $ 3,410

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