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Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets    
Allowance for loan losses $ 2,848 $ 4,640
Deferred compensation 1,213 1,762
Intangible assets 95 187
Pension costs   277
Other 141 102
Deferred tax asset 4,297 6,968
Deferred tax liabilities    
Tax depreciation in excess of book depreciation (275) (97)
Discount accretion on securities (43) (58)
Purchase accounting adjustments (536) (1,091)
FHLB stock dividends (1,053) (1,705)
Unrealized gain on securities available for sale (847) (1,035)
Pension costs (293)  
Prepaids (320)  
Other (166) (256)
Deferred tax liability (3,533) (4,242)
Net deferred tax asset $ 764 $ 2,726