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Investments - Gross Realized Gains and Losses on Sale of Debt Securities (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract]    
Gross realized gain on debt securities $ 12 $ 87
Gross realized loss on debt securities (40) (16)
Total (loss) gain recognized, net $ (28) $ 71