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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 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance $ 397,434,000 $ 369,659,000 $ 388,502,000 $ 372,002,000
Amounts reclassified from accumulated other comprehensive income (loss) 0 0 0 0
Net current-period other comprehensive income (loss) (2,071,000) (576,000) (663,000) (6,803,000)
Ending balance 404,137,000 373,808,000 404,137,000 373,808,000
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (47,655,000) (49,251,000) (48,851,000) (43,024,000)
Other comprehensive income (loss) before reclassifications (2,071,000) (576,000) (875,000) (6,803,000)
Net current-period other comprehensive income (loss) (2,071,000) (576,000) (875,000) (6,803,000)
Ending balance (49,726,000) (49,827,000) (49,726,000) (49,827,000)
Defined Benefit Pension Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (4,294,000) (4,506,000) (4,506,000) (4,506,000)
Other comprehensive income (loss) before reclassifications 0 0 212,000 0
Net current-period other comprehensive income (loss) 0 0 212,000 0
Ending balance (4,294,000) (4,506,000) (4,294,000) (4,506,000)
Accumulated Other Comprehensive Income (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (51,949,000) (53,757,000) (53,357,000) (47,530,000)
Other comprehensive income (loss) before reclassifications (2,071,000) (576,000) (663,000) (6,803,000)
Net current-period other comprehensive income (loss) (2,071,000) (576,000) (663,000) (6,803,000)
Ending balance $ (54,020,000) $ (54,333,000) $ (54,020,000) $ (54,333,000)