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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 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance $ 404,137,000 $ 373,808,000 $ 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) 9,552,000 14,422,000 8,889,000 7,619,000
Ending balance 499,028,000 394,438,000 499,028,000 394,438,000
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (49,726,000) (49,827,000) (48,851,000) (43,024,000)
Other comprehensive income (loss) before reclassifications 9,500,000 14,422,000 8,625,000 7,619,000
Net current-period other comprehensive income (loss) 9,500,000 14,422,000 8,625,000 7,619,000
Ending balance (40,226,000) (35,405,000) (40,226,000) (35,405,000)
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)
Cashflow Hedge [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance 0   0  
Other comprehensive income (loss) before reclassifications 52,000   52,000  
Net current-period other comprehensive income (loss) 52,000   52,000  
Ending balance 52,000   52,000  
Accumulated Other Comprehensive Income (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (54,020,000) (54,333,000) (53,357,000) (47,530,000)
Other comprehensive income (loss) before reclassifications 9,552,000 14,422,000 8,889,000 7,619,000
Net current-period other comprehensive income (loss) 9,552,000 14,422,000 8,889,000 7,619,000
Ending balance $ (44,468,000) $ (39,911,000) $ (44,468,000) $ (39,911,000)