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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, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss, Beginning Balance     $ (1,554) $ (1,304)
Unrealized holding gains, net of tax $ 660 $ 101 344 1,016
Reclassification adjustment, net of tax   60 34 45
Change during period 660 161 378 1,061
Accumulated other comprehensive loss, Ending Balance (1,176) (243) (1,176) (243)
Securities Available for Sale [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss, Beginning Balance     (133) (1,129)
Unrealized holding gains, net of tax     344 1,016
Reclassification adjustment, net of tax     34 45
Change during period     378 1,061
Accumulated other comprehensive loss, Ending Balance 245 (68) 245 (68)
Adjustments Related to Pension Benefits [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss, Beginning Balance     (1,421) (175)
Accumulated other comprehensive loss, Ending Balance $ (1,421) $ (175) $ (1,421) $ (175)