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Investments - Additional Information (Detail)
$ in Thousands
Jun. 30, 2022
USD ($)
loan
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Debt Securities, Available-for-sale [Line Items]            
Allowance for credit losses $ 282          
Outstanding principal on nonaccrual loan 4,100   $ 4,100      
Unfunded loan commitment            
Debt Securities, Available-for-sale [Line Items]            
Unfunded commitment balance to commercial loan borrowers $ 23,000          
Commercial mortgage participations            
Debt Securities, Available-for-sale [Line Items]            
Number of loans | loan 20          
Allowance for credit losses $ 1,109 $ 827 827 $ 1,639 $ 2,147 $ 3,505
Unfunded commitment balance to commercial loan borrowers $ 141,696   $ 141,843