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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance     $ 58,154 [1] $ 52,151
Other comprehensive income, net of tax, before reclassification     (1,667) 623
Reclassification adjustment from accumulated other comprehensive income, net of tax     99 16
Total other comprehensive (loss) income $ (521) $ (157) (1,766) 607
Ending Balance 63,651 57,534 63,651 57,534
Unrealized holding gains (losses), tax (139) (76) (443) 321
Reclassification adjustment, tax 0 (4) 0 (8)
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)
Other comprehensive income, net of tax, before reclassification     (1,667) 623
Reclassification adjustment from accumulated other comprehensive income, net of tax       16
Total other comprehensive (loss) income     (1,667) 607
Ending Balance (2,724) (253) (2,724) (253)
Adjustments Related to Pension Benefits        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance     99 0
Reclassification adjustment from accumulated other comprehensive income, net of tax     99 0
Total other comprehensive (loss) income     (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)
Total other comprehensive (loss) income     (1,766) 607
Ending Balance $ (2,724) $ (253) $ (2,724) $ (253)
[1] Derived from audited consolidated financial statements.