Annual report pursuant to Section 13 and 15(d)

COMMITMENTS AND CONTINGENCIES - Narrative (Details)

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COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Loss Contingencies [Line Items]      
Representation and warranties $ 9,800    
Residential mortgage loan repurchase liability [1] 1,452,005 $ 172,336  
Rent expense, net of sublease income 13,400 10,300 $ 4,800
Sublease rentals 1,100    
Consumer Portfolio Segment      
Loss Contingencies [Line Items]      
Loans of unfunded and available revolving credit privileges 685,575 $ 827,545  
New Penn      
Loss Contingencies [Line Items]      
Committed to fund 15,000,000    
Consumer Loan SPVs | Consumer Portfolio Segment | Unfunded Loan Commitment      
Loss Contingencies [Line Items]      
Loans of unfunded and available revolving credit privileges $ 23,200    
[1] See Note 6 for details.