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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, 2019
Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ 298,898 $ 184,461
Total other comprehensive income (loss) 4,969 (2,426)
Ending balance 312,057 188,043
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance 2,347 3,185
Other comprehensive income before reclassifications 4,850 (2,539)
Amounts reclassified from accumulated other comprehensive loss 3  
Total other comprehensive income (loss) 4,853 (2,539)
Reclassification of equity securities from accumulated other comprehensive loss   (278)
Ending balance 7,200 368
Defined Benefit Pension Items [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (3,799) (4,309)
Amounts reclassified from accumulated other comprehensive loss 116 113
Total other comprehensive income (loss) 116 113
Ending balance (3,683) (4,196)
Accumulated Other Comprehensive Loss [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (1,452) (1,124)
Other comprehensive income before reclassifications 4,850 (2,539)
Amounts reclassified from accumulated other comprehensive loss 119 113
Total other comprehensive income (loss) 4,969 (2,426)
Reclassification of equity securities from accumulated other comprehensive loss   (278)
Ending balance $ 3,517 $ (3,828)