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Accumulated Other Comprehensive Loss - Schedule of Changes in Component of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance     $ 58,154 [1] $ 52,151
Unrealized holding (losses) gains, net of tax $ (284) $ 392 (1,146) 773
Reclassification adjustment (net of tax, ($4)) 0 9 0 9
Pension liability adjustment (net of tax, ($27)) 0 0 (99) 0
Change during period (284) 383 (1,245) 764
Ending Balance 61,648 55,967 61,648 55,967
Unrealized holding gains (losses), tax (75) 201 (304) 397
Reclassification adjustment, tax 0 (4) 0 (4)
Pension liability adjustment, tax 0 0 (27) 0
Net Unrealized Gains (Losses) on Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance     (1,057) (860)
Unrealized holding (losses) gains, net of tax     (1,146) 773
Reclassification adjustment (net of tax, ($4))       9
Pension liability adjustment (net of tax, ($27))     0  
Change during period     (1,146) 764
Ending Balance (2,203) (96) (2,203) (96)
Adjustments Related to Pension Benefits        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance     99 0
Unrealized holding (losses) gains, net of tax     0 0
Reclassification adjustment (net of tax, ($4))       0
Pension liability adjustment (net of tax, ($27))     (99)  
Change during period     (99) 0
Ending Balance 0 0 0 0
Accumulated Other Comprehensive Loss        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance     (958) (860)
Unrealized holding (losses) gains, net of tax     (1,146) 773
Reclassification adjustment (net of tax, ($4))       9
Pension liability adjustment (net of tax, ($27))     (99)  
Change during period     (1,245) 764
Ending Balance $ (2,203) $ (96) $ (2,203) $ (96)
[1] Derived from audited consolidated financial statements.