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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance $ 369,659,000 $ 347,697,000 $ 372,002,000 $ 334,835,000
Amounts reclassified from accumulated other comprehensive income (loss) 0 0 0 0
Total other comprehensive income (loss) (576,000) (5,860,000) (6,803,000) 2,275,000
Ending balance 373,808,000 349,876,000 373,808,000 349,876,000
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (49,251,000) (44,636,000) (43,024,000) (52,771,000)
Other comprehensive loss before reclassifications (576,000) (5,860,000) (6,803,000) 2,275,000
Amounts reclassified from accumulated other comprehensive income (loss) 0 0 0 0
Total other comprehensive income (loss) (576,000) (5,860,000) (6,803,000) 2,275,000
Ending balance (49,827,000) (50,496,000) (49,827,000) (50,496,000)
Defined Benefit Pension Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (4,506,000) (5,274,000) (4,506,000) (5,274,000)
Other comprehensive loss before reclassifications 0 0 0 0
Amounts reclassified from accumulated other comprehensive income (loss) 0 0 0 0
Total other comprehensive income (loss) 0 0 0 0
Ending balance (4,506,000) (5,274,000) (4,506,000) (5,274,000)
Accumulated Other Comprehensive Income (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (53,757,000) (49,910,000) (47,530,000) (58,045,000)
Other comprehensive loss before reclassifications (576,000) (5,860,000) (6,803,000) 2,275,000
Amounts reclassified from accumulated other comprehensive income (loss) 0 0 0 0
Total other comprehensive income (loss) (576,000) (5,860,000) (6,803,000) 2,275,000
Ending balance $ (54,333,000) $ (55,770,000) $ (54,333,000) $ (55,770,000)