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Income Taxes - Net Deferred Tax Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred Tax Assets    
Allowance for loan losses $ 1,052 $ 1,118
Securities available for sale 481 281
Accrued health insurance 0 11
Core deposit intangible 371 317
Unvested stock-based compensation 14 9
Limited partnership investments 14 5
Loan origination fees, net 58 63
Deferred tax assets, Total 1,990 1,804
Deferred Tax Liabilities    
Depreciation 682 562
Discount accretion 1 0
Overfunded pension liability 0 27
Deferred tax liabilities, Total 683 589
Net deferred tax assets $ 1,307 $ 1,215