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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
Mar. 31, 2018
Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ 184,461  
Amounts reclassified from accumulated other comprehensive loss 113 $ 62
Total other comprehensive income (loss) (2,426) 361
Ending balance 188,043  
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance 3,185 2,008
Other comprehensive income before reclassifications (2,539) 299
Total other comprehensive income (loss) (2,539) 299
Reclassification of equity securities from accumulated other comprehensive loss (278)  
Ending balance 368 2,307
Defined Benefit Pension Items [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (4,309) (4,345)
Amounts reclassified from accumulated other comprehensive loss 113 62
Total other comprehensive income (loss) 113 62
Ending balance (4,196) (4,283)
Accumulated Other Comprehensive Loss [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (1,124) (2,337)
Other comprehensive income before reclassifications (2,539) 299
Amounts reclassified from accumulated other comprehensive loss 113 62
Total other comprehensive income (loss) (2,426) 361
Reclassification of equity securities from accumulated other comprehensive loss (278)  
Ending balance $ (3,828) $ (1,976)