CURRENT EXPECTED CREDIT LOSSES - Internal Credit Risk Rating (Details) - Loans Held for Investment $ in Thousands	Mar. 31, 2022 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
2022	$ 179,495
2021	1,042,932
2020	320,711
2019	400,451
2018	291,570
Prior	186,613
Total	2,421,772
1 - Very Low Risk
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0
2021	35,806
2020	0
2019	33,905
2018	9,393
Prior	0
Total	79,104
2 - Low Risk
Financing Receivable, Credit Quality Indicator [Line Items]
2022	19,771
2021	495,289
2020	0
2019	105,949
2018	22,816
Prior	96,819
Total	740,644
3 - Medium Risk
Financing Receivable, Credit Quality Indicator [Line Items]
2022	159,724
2021	511,837
2020	320,711
2019	260,597
2018	157,575
Prior	89,794
Total	1,500,238
4 - High Risk/Potential for Loss: Asset performance is trailing underwritten expectations. Loan at risk of impairment without material improvement to performance
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0
2021	0
2020	0
2019	0
2018	101,786
Prior	0
Total	101,786
5 - Impaired/Loss Likely: A loan that has significantly increased probability of default or principal loss
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0
2021	0
2020	0
2019	0
2018	0
Prior	0
Total	$ 0