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LOANS - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Assets $ 76,185,134,000   $ 76,764,064,000 [1]
Loan loss (provision) reversal 608,000 $ (139,620,000)  
Allowance for loan loss $ 28,500,000   27,900,000
Minimum      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Senior secured loans, stated maturity (in years) 5 years    
Maximum      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Senior secured loans, stated maturity (in years) 8 years    
Residential Mortgage Loans      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Assets $ 1,700,000,000   2,300,000,000
Loans held-for-sale $ 1,900,000   $ 2,300,000
Percent of adjustable-rate loans 13.00%   16.00%
Corporate Loans      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Loan loss (provision) reversal $ 0    
Unfunded commitments 284,500,000   $ 278,900,000
Unfunded commitments, expected credit loss 2,500,000   2,300,000
Corporate Loans | Cumulative effect, period of adoption, adjusted balance      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Loan loss (provision) reversal 600,000 $ (6,200,000)  
Residential mortgage loan warehouse facility      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Assets $ 0   $ 980,000
[1] (1)Derived from the audited consolidated financial statements at December 31, 2021.