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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, 2021
Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ 350,108 $ 330,126
Total other comprehensive income (loss) (5,050) 3,014
Ending balance 350,058 328,167
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance 21,447 12,883
Other comprehensive income before reclassifications (5,116) 2,957
Amounts reclassified from accumulated other comprehensive income (loss) 1  
Total other comprehensive income (loss) (5,115) 2,957
Ending balance 16,332 15,840
Defined Benefit Pension Items [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (6,828) (6,009)
Amounts reclassified from accumulated other comprehensive income (loss) 65 57
Total other comprehensive income (loss) 65 57
Ending balance (6,763) (5,952)
Accumulated Other Comprehensive Income (Loss) [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance 14,619 6,874
Other comprehensive income before reclassifications (5,116) 2,957
Amounts reclassified from accumulated other comprehensive income (loss) 66 57
Total other comprehensive income (loss) (5,050) 3,014
Ending balance $ 9,569 $ 9,888