Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVES - Narrative (Details)

v3.10.0.1
DERIVATIVES - Narrative (Details) - Not Designated as Hedging Instrument - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
TBAs | Short    
Derivative [Line Items]    
Derivative asset, notional amount $ 5,466,100 $ 3,101,100
TBAs | Long    
Derivative [Line Items]    
Derivative asset, notional amount 4,207,800 1,014,000
Interest Rate Lock Commitments    
Derivative [Line Items]    
Derivative asset, notional amount 572,654 0
Forward Loan Sale Commitments    
Derivative [Line Items]    
Derivative asset, notional amount $ 28,402 $ 0