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Accumulated Other Comprehensive Loss - Schedule of Changes in Component of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ 58,154 $ 52,151
Unrealized holding losses, net of tax (752) (82)
Reclassification adjustment, net of tax 1 59
Pension liability adjustment, net of tax (99) 83
Total other comprehensive (loss) income (850) 60
Ending balance 66,674 58,154
Unrealized holding losses, tax (200) (43)
Reclassification adjustment, tax 0 31
Pension liability adjustment, tax (27) 43
Net Unrealized Losses on Securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (1,057) (860)
Unrealized holding losses, net of tax (752) (82)
Reclassification adjustment, net of tax 1 59
Pension liability adjustment, net of tax 0 0
Reclassification of tax effects stranded in accumulated other comprehensive loss by tax rate change   (174)
Total other comprehensive (loss) income (751) (197)
Ending balance (1,808) (1,057)
Adjustments Related to Pension Benefits    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 99 0
Unrealized holding losses, net of tax 0 0
Reclassification adjustment, net of tax 0 0
Pension liability adjustment, net of tax (99) 83
Reclassification of tax effects stranded in accumulated other comprehensive loss by tax rate change   16
Total other comprehensive (loss) income (99) 99
Ending balance 0 99
Accumulated Other Comprehensive Loss    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (958) (860)
Unrealized holding losses, net of tax (752) (82)
Reclassification adjustment, net of tax 1 59
Pension liability adjustment, net of tax (99) 83
Reclassification of tax effects stranded in accumulated other comprehensive loss by tax rate change   (158)
Total other comprehensive (loss) income (850) (98)
Ending balance $ (1,808) $ (958)