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Other Comprehensive Income - Changes in Each Component of Accumulated Other Comprehensive Income (Loss), Net of Tax (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     $ 137,616  
Amounts reclassified from accumulated other comprehensive loss $ 281 $ 59 343 $ 111
Net current-period other comprehensive income 1,240 1,106 1,601 2,419
Ending balance 178,843   178,843  
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance 2,307 4,812 2,008 3,554
Other comprehensive income before reclassifications 959 1,047 1,258 2,308
Amounts reclassified from accumulated other comprehensive loss   4   1
Net current-period other comprehensive income 959 1,051 1,258 2,309
Ending balance 3,266 5,863 3,266 5,863
Defined Benefit Pension Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (4,283) (3,994) (4,345) (4,049)
Amounts reclassified from accumulated other comprehensive loss 281 55 343 110
Net current-period other comprehensive income 281 55 343 110
Ending balance (4,002) (3,939) (4,002) (3,939)
Accumulated Other Comprehensive Loss [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (1,976) 818 (2,337) (495)
Other comprehensive income before reclassifications 959 1,047 1,258 2,308
Amounts reclassified from accumulated other comprehensive loss 281 59 343 111
Net current-period other comprehensive income 1,240 1,106 1,601 2,419
Ending balance $ (736) $ 1,924 $ (736) $ 1,924