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Income Taxes - Net Deferred Tax Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred Tax Assets    
Allowance for loan losses $ 1,809 $ 1,878
Allowance for other real estate owned   76
Unfunded pension liability   719
Gain on other real estate owned   672
Securities available for sale 447 102
Accrued pension 689 568
Core deposit intangible 371 179
Unvested stock-based compensation 19 11
Limited partnership investments 17  
Loan origination fees, net 48  
Deferred Tax Assets, Gross, Total 3,400 4,205
Deferred Tax Liabilities    
Depreciation 708 693
Discount accretion 2 2
Loan origination costs, net   18
Deferred Tax Liabilities, Total 710 713
Net deferred tax assets $ 2,690 $ 3,492