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Other Comprehensive Income (Loss) - Changes in Each Component of Accumulated Other Comprehensive Loss, Net of Tax (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance $ 184,461 $ 137,616 $ 125,173
Total other comprehensive income (loss) (50) 1,412 (1,842)
Ending balance 298,898 184,461 137,616
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance 3,185 2,008 3,554
Other comprehensive income (loss) before reclassifications (886) 620 (1,533)
Amounts reclassified from accumulated other comprehensive loss 326 (8) (13)
Total other comprehensive income (loss) (560) 612 (1,546)
Reclassification of certain income tax effects from accumulated other comprehensive loss   565  
Reclassification of equity securities from accumulated other comprehensive loss (278)    
Ending balance 2,347 3,185 2,008
Defined Benefit Pension Items [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (4,309) (4,345) (4,049)
Other comprehensive income (loss) before reclassifications 393 553 (511)
Amounts reclassified from accumulated other comprehensive loss 117 247 215
Total other comprehensive income (loss) 510 800 (296)
Reclassification of certain income tax effects from accumulated other comprehensive loss   (764)  
Ending balance (3,799) (4,309) (4,345)
Accumulated Other Comprehensive Loss [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (1,124) (2,337) (495)
Other comprehensive income (loss) before reclassifications (493) 1,173 (2,044)
Amounts reclassified from accumulated other comprehensive loss 443 239 202
Total other comprehensive income (loss) (50) 1,412 (1,842)
Reclassification of certain income tax effects from accumulated other comprehensive loss   (199)  
Reclassification of equity securities from accumulated other comprehensive loss (278)    
Ending balance $ (1,452) $ (1,124) $ (2,337)