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Subsequent Events - Additional Information (Detail)
policyholder in Thousands, $ in Millions
1 Months Ended
Apr. 28, 2020
USD ($)
Apr. 14, 2020
USD ($)
policyholder
Apr. 13, 2020
USD ($)
May 31, 2018
USD ($)
Mar. 31, 2020
USD ($)
Subsequent Event [Line Items]          
FHLB stock purchased       $ 7.0  
FHLB credit available         $ 622.0
Subsequent Event          
Subsequent Event [Line Items]          
FHLB advances $ 245.0   $ 240.0    
FHLB stock purchased $ 5.0   $ 10.0    
FHLB advances, interest rate, percentage 0.38%   0.25%    
Subsequent Event | Automobile Policyholders          
Subsequent Event [Line Items]          
Credit granted to policyholders   15.00%      
Number of policyholders | policyholder   338      
Increase (decrease) in policyholder balance   $ 15.0      
Policies non payment extension term (in days)   60 days