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Accumulated Other Comprehensive Income (Loss) - Changes in Each Component of Accumulated Other Comprehensive Income (Loss), Net of Tax (Detail) - USD ($)
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ 388,502,000 $ 372,002,000
Amounts reclassified from accumulated other comprehensive income (loss) 0 0
Net current-period other comprehensive income (loss) 1,408,000 (6,227,000)
Ending balance 397,434,000 369,659,000
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (48,851,000) (43,024,000)
Other comprehensive income (loss) before reclassifications 1,196,000 (6,227,000)
Net current-period other comprehensive income (loss) 1,196,000 (6,227,000)
Ending balance (47,655,000) (49,251,000)
Defined Benefit Pension Items [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (4,506,000) (4,506,000)
Other comprehensive income (loss) before reclassifications 212,000 0
Net current-period other comprehensive income (loss) 212,000 0
Ending balance (4,294,000) (4,506,000)
Accumulated Other Comprehensive Income (Loss) [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (53,357,000) (47,530,000)
Other comprehensive income (loss) before reclassifications 1,408,000 (6,227,000)
Net current-period other comprehensive income (loss) 1,408,000 (6,227,000)
Ending balance $ (51,949,000) $ (53,757,000)