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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     $ 184,461  
Total other comprehensive income (loss) $ (625) $ 339 (3,479) $ 1,940
Ending balance 289,388   289,388  
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (173) 3,266 3,185 2,008
Other comprehensive income before reclassifications (1,048) 51 (4,123) 1,309
Amounts reclassified from accumulated other comprehensive loss 310 6 305 6
Total other comprehensive income (loss) (738) 57 (3,818) 1,315
Reclassification of equity securities from accumulated other comprehensive loss     (278)  
Ending balance (911) 3,323 (911) 3,323
Defined Benefit Pension Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (4,083) (4,002) (4,309) (4,345)
Amounts reclassified from accumulated other comprehensive loss 113 282 339 625
Total other comprehensive income (loss) 113 282 339 625
Ending balance (3,970) (3,720) (3,970) (3,720)
Accumulated Other Comprehensive Loss [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (4,256) (736) (1,124) (2,337)
Other comprehensive income before reclassifications (1,048) 51 (4,123) 1,309
Amounts reclassified from accumulated other comprehensive loss 423 288 644 631
Total other comprehensive income (loss) (625) 339 (3,479) 1,940
Reclassification of equity securities from accumulated other comprehensive loss     (278)  
Ending balance $ (4,881) $ (397) $ (4,881) $ (397)