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Net Federal Income Taxes and Cash Interest Paid (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Supplemental Cash Flow Information [Abstract]      
Federal income taxes paid $ 2,794 $ 613 $ 426
Interest paid $ 17 $ 0 $ 5,125