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FAIR VALUE OF FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 21 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans held for sale $ 708,086   $ 708,086   $ 708,086 $ 462,665
Loans held for sale forgiven 97,600   387,900   434,200  
Revenue 3,844,727 $ 3,033,874 13,582,669 $ 6,338,608    
Paycheck Protection Program, CARES Act Loans            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans held for sale 605,400   605,400   $ 605,400  
Revenue 13,300   37,600      
Loans Receivable Held-For-Sale            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Excess amortized cost over fair value of loans $ 4,400 $ 3,200 $ 6,000 $ 25,700