Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVES - Derivatives Recorded at Fair Value (Details)

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DERIVATIVES - Derivatives Recorded at Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Derivative [Line Items]    
Derivative assets $ 266,904 $ 290,144
Derivative liabilities 54,766 119,762
Interest rate lock commitments | Other assets    
Derivative [Line Items]    
Derivative assets 144,365 289,355
Interest rate lock commitments | Accrued expenses and other liabilities    
Derivative [Line Items]    
Derivative liabilities 19,983 281
TBAs | Other assets    
Derivative [Line Items]    
Derivative assets 122,539 789
TBAs | Accrued expenses and other liabilities    
Derivative [Line Items]    
Derivative liabilities 22,159 119,456
Interest rate swaps    
Derivative [Line Items]    
Derivative asset, variation margin accounts 60,000 237,700
Interest rate swaps | Accrued expenses and other liabilities    
Derivative [Line Items]    
Derivative liabilities 1,082 25
Treasury futures and options on treasury futures    
Derivative [Line Items]    
Derivative liabilities $ 11,542 $ 0