Annual report pursuant to Section 13 and 15(d)

DERIVATIVES - Notional Amount (Details)

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DERIVATIVES - Notional Amount (Details) - Not Designated as Hedging Instrument - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Interest Rate Caps    
Derivative [Line Items]    
Derivative asset, notional amount $ 12,500 $ 50,000
Derivative, notional amount $ 12,500  
Derivative, cap interest rate 4.00%  
Average remaining maturity (in months) 11 months  
Interest Rate Caps | Short    
Derivative [Line Items]    
Derivative, cap interest rate 1.90%  
Interest Rate Swaps    
Derivative [Line Items]    
Derivative asset, notional amount $ 4,900,000 4,725,000
Interest Rate Swaps | Short    
Derivative [Line Items]    
Derivative asset, notional amount $ 900,000  
Average remaining maturity (in months) 87 months  
Interest Rate Swaps | Long    
Derivative [Line Items]    
Derivative, notional amount $ 4,000,000 $ 4,700,000
Derivative, cap interest rate 3.20% 3.21%
Average remaining maturity (in months) 36 months 52 months
Interest Rate Lock Commitments    
Derivative [Line Items]    
Derivative asset, notional amount $ 4,043,935 $ 823,187
Forward Loan Sale Commitments    
Derivative [Line Items]    
Derivative asset, notional amount 43,654 30,274
TBAs | Short    
Derivative [Line Items]    
Derivative liability, notional amount 5,048,000 5,904,300
TBAs | Long    
Derivative [Line Items]    
Derivative liability, notional amount $ 11,692,212 $ 5,067,200