INVESTMENTS (Additional Information) (Detail) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentLineItems
Investments available-for-sale book value	$ 484.4	$ 424.8
Government National Mortgage Association Certificates And Obligations Federal National Mortgage Association Certificates And Obligations And Federal Home Loan Mortgage Corporation Certificates And Obligations [Member] | Collateralized Mortgage Obligations [Member]
ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentLineItems
Financial Instruments, Owned, Mortgages, Mortgage-backed and Asset-backed Securities, at Fair Value	309.2
Government National Mortgage Association Certificates And Obligations Federal National Mortgage Association Certificates And Obligations And Federal Home Loan Mortgage Corporation Certificates And Obligations [Member] | Mortgage Backed Securities [Member]
ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentLineItems
Financial Instruments, Owned, Mortgages, Mortgage-backed and Asset-backed Securities, at Fair Value	498.8
Government National Mortgage Association Certificates And Obligations Federal National Mortgage Association Certificates And Obligations And Federal Home Loan Mortgage Corporation Certificates And Obligations [Member] | SBA asset backed securities [Member]
ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentLineItems
Financial Instruments, Owned, Mortgages, Mortgage-backed and Asset-backed Securities, at Fair Value	$ 70.0