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Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total before tax $ 25 $ 606
Income tax benefit 2,899 573
Unrealized Gains and Losses on Available for Sale Securities    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total before tax 25 606
Reclassification out of Accumulated Other Comprehensive Income    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total reclassifications, net of tax 22 487
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains and Losses on Available for Sale Securities    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Other net realized investment losses 25 606
Income tax benefit $ (3) $ (119)