INVESTMENTS (Additional Information) (Detail) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentLineItems
Investments available-for-sale book value	$ 417.1	$ 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	169.3
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	481.9
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	$ 67.3