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Accumulated Other Comprehensive Loss - Schedule of Changes in Component of Accumulated Other Comprehensive Loss (Detail) - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance $ 58,154,000 [1] $ 52,151,000
Unrealized holding (losses) gains, net of tax (862,000) 381,000
Pension liability adjustment, net of tax (99,000) 0
Change during period (961,000) 381,000
Ending Balance 59,693,000 53,978,000
Unrealized holding gains, tax (229,000) 196,000
Pension liability adjustment, tax (27,000) 0
Reclassification from AOCI current period, net of tax 0 0
Net Unrealized Gains (Losses) on Securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance (1,057,000) (860,000)
Unrealized holding (losses) gains, net of tax (862,000) 381,000
Pension liability adjustment, net of tax 0  
Change during period (862,000) 381,000
Ending Balance (1,919,000) (479,000)
Adjustments Related to Pension Benefits    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance 99,000 0
Unrealized holding (losses) gains, net of tax 0 0
Pension liability adjustment, net of tax (99,000)  
Change during period (99,000) 0
Ending Balance 0 0
Accumulated Other Comprehensive Loss    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance (958,000) (860,000)
Unrealized holding (losses) gains, net of tax (862,000) 381,000
Pension liability adjustment, net of tax (99,000)  
Change during period (961,000) 381,000
Ending Balance $ (1,919,000) $ (479,000)
[1] Derived from audited consolidated financial statements.