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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance     $ 52,151 [1] $ 45,953
Unrealized holding (losses) gains on available for sale securities, net of tax $ (150) $ 155 623 1,151
Reclassification adjustment for gains included in net income, net of tax (7) (3) (16) (7)
Change during period (157) 152 607 1,144
Ending Balance 57,534 50,983 57,534 50,983
Unrealized holding gains, tax (76) 78 321 593
Reclassification adjustment, tax (4) (1) (8) (3)
Net Unrealized Gains (Losses) on Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance     (860) (192)
Unrealized holding (losses) gains on available for sale securities, net of tax     623 1,151
Reclassification adjustment for gains included in net income, net of tax     (16) (7)
Change during period     607 1,144
Ending Balance (253) 952 (253) 952
Adjustments Related to Pension Benefits        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance     0 (1,396)
Unrealized holding (losses) gains on available for sale securities, net of tax     0 0
Reclassification adjustment for gains included in net income, 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 (losses) gains on available for sale securities, net of tax     623 1,151
Reclassification adjustment for gains included in net income, net of tax     (16) (7)
Change during period     607 1,144
Ending Balance $ (253) $ (444) $ (253) $ (444)
[1] Derived from audited consolidated financial statements.