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Other Comprehensive Income (Loss) - Changes in Each Component of Accumulated Other Comprehensive Income (Loss), Net of Tax (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning balance $ 350,108 $ 330,126 $ 298,898
Net current-period other comprehensive income (loss) (5,799) 7,745 8,326
Ending balance 355,212 350,108 330,126
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning balance 21,447 12,883 2,347
Other comprehensive income (loss) before reclassifications (6,771) 8,638 10,561
Amounts reclassified from accumulated other comprehensive income (loss) (1) (74) (25)
Net current-period other comprehensive income (loss) (6,772) 8,564 10,536
Ending balance 14,675 21,447 12,883
Defined Benefit Pension Items [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning balance (6,828) (6,009) (3,799)
Other comprehensive income (loss) before reclassifications 783 (1,047) (2,333)
Amounts reclassified from accumulated other comprehensive income (loss) 190 228 123
Net current-period other comprehensive income (loss) 973 (819) (2,210)
Ending balance (5,855) (6,828) (6,009)
Accumulated Other Comprehensive Income (Loss) [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning balance 14,619 6,874 (1,452)
Other comprehensive income (loss) before reclassifications (5,988) 7,591 8,228
Amounts reclassified from accumulated other comprehensive income (loss) 189 154 98
Net current-period other comprehensive income (loss) (5,799) 7,745 8,326
Ending balance $ 8,820 $ 14,619 $ 6,874