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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Loans Held-for-Investment, Net (Detail)
6 Months Ended 12 Months Ended
Jun. 30, 2022
USD ($)
loan
Dec. 31, 2021
USD ($)
loan
Financial Asset, Not Past Due    
Loans Held-for-Investment, Net    
Amortized cost of loans held for investment, current $ 236,300,000 $ 258,600,000
Loans originated in 2022 48,600,000  
Loans originated in 2021 160,500,000  
Loan originated in 2019 $ 28,300,000  
Loans Held for Investment    
Loans Held-for-Investment, Net    
Number of loans held for investment | loan 9 12
Unpaid principal balance of loans held for investment $ 252,100,000 $ 274,500,000
Net unamortized deferred fees and costs 900,000 1,200,000
Allowance for loan losses $ 4,000,000.0 $ 4,200,000
Reasonable and supportable forecast period used for determining CECL reserves 1 year  
Number of delinquent loans 1 1
Charge off rate for forecasted period 0.11% 0.15%
Charge off rate for the remaining period 0.06% 0.09%
Loans held for investment, delinquent $ 14,700,000 $ 14,700,000
Number of loans on nonaccrual status | loan 1 1
Loans, non-accrual status $ 14,700,000 $ 14,700,000
Specific reserve for loan $ 3,700,000 $ 3,700,000
Loans Held for Investment | Maximum    
Loans Held-for-Investment, Net    
Loan term (in years) 3 years