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VARIABLE INTEREST ENTITIES - Nonconsolidated VIEs (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Variable Interest Entity [Line Items]    
Trading securities $ 56,412 $ 0
Total assets 12,749,278 10,893,228
Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Total assets 74,765  
Maximum exposure to loss in non-consolidated VIEs 74,765  
Variable Interest Entity, Not Primary Beneficiary | Joint Venture    
Variable Interest Entity [Line Items]    
Investments in joint ventures 18,353 17,528
Maximum exposure to loss in non-consolidated VIEs 18,353 17,528
Total assets in VIEs 12,295 $ 15,342
Variable Interest Entity, Not Primary Beneficiary | Retained Interests    
Variable Interest Entity [Line Items]    
Trading securities 56,412  
Maximum exposure to loss in non-consolidated VIEs 56,412  
Total assets in VIEs $ 1,085,924