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Accumulated Other Comprehensive Income (Loss) - Changes in Each Component of Accumulated Other Comprehensive Income (Loss), Net of Tax (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ 372,002 $ 334,835
Total other comprehensive (loss) (6,227) 8,135
Ending balance 369,659 347,697
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (43,024) (52,771)
Other comprehensive loss before reclassifications (6,227) 8,135
Amounts reclassified from accumulated other comprehensive income (loss) 0 0
Total other comprehensive (loss) (6,227) 8,135
Ending balance (49,251) (44,636)
Defined Benefit Pension Items [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (4,506) (5,274)
Other comprehensive loss before reclassifications 0 0
Amounts reclassified from accumulated other comprehensive income (loss) 0 0
Total other comprehensive (loss) 0 0
Ending balance (4,506) (5,274)
Accumulated Other Comprehensive Income (Loss) [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (47,530) (58,045)
Other comprehensive loss before reclassifications (6,227) 8,135
Amounts reclassified from accumulated other comprehensive income (loss) 0 0
Total other comprehensive (loss) (6,227) 8,135
Ending balance $ (53,757) $ (49,910)