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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance     $ 52,151 [1] $ 45,953
Unrealized holding gains, net of tax $ 392 $ 247 773 996
Reclassification adjustment, net of tax (9) 0 (9) (4)
Change during period 383 247 764 992
Ending Balance 55,967 49,258 55,967 49,258
Unrealized holding gains, tax 201 126 397 515
Reclassification adjustment, tax (4) 0 (4) (2)
Net Unrealized Gains (Losses) on Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance     (860) (192)
Unrealized holding gains, net of tax     773 996
Reclassification adjustment, net of tax     (9) (4)
Change during period     764 992
Ending Balance (96) 800 (96) 800
Adjustments Related to Pension Benefits        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance     0 (1,396)
Unrealized holding gains, net of tax     0 0
Reclassification adjustment, net of tax     0 0
Change during period     0 0
Ending Balance 0 (1,396) 0 (1,396)
Accumulated Other Comprehensive Loss        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance     (860) (1,588)
Unrealized holding gains, net of tax     773 996
Reclassification adjustment, net of tax     (9) (4)
Change during period     764 992
Ending Balance $ (96) $ (596) $ (96) $ (596)
[1] Derived from audited consolidated financial statements.