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Income Taxes - Net Deferred Tax Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred Tax Assets    
Allowance for loan losses $ 1,118 $ 1,809
Securities available for sale 281 447
Accrued pension 0 689
Accrued health insurance 11 0
Core deposit intangible 317 371
Unvested stock-based compensation 9 19
Limited partnership investments 5 17
Loan origination fees, net 63 48
Deferred tax assets, Total 1,804 3,400
Deferred Tax Liabilities    
Depreciation 562 708
Discount accretion 0 2
Overfunded pension liability 27 0
Deferred tax liabilities, Total 589 710
Net deferred tax assets $ 1,215 $ 2,690