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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Outstanding Derivative Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Derivative [Line Items]    
Fair Value, Asset $ 341,359 $ 647,939
Fair Value, Liability 48,899 168,169
Interest rate lock commitments    
Derivative [Line Items]    
Notional, Assets 16,362,632 31,365,494
Notional, Liabilities 2,020,206 99,635
Fair Value, Asset 266,118 647,349
Fair Value, Liability 6,908 304
Forward sales contracts    
Derivative [Line Items]    
Notional, Assets 38,373,245 44,694
Notional, Liabilities 203,024 54,397,834
Fair Value, Asset 75,241 107
Fair Value, Liability 39 163,566
Put options on treasuries    
Derivative [Line Items]    
Notional, Assets 0
Notional, Liabilities 36,950 27,803
Fair Value, Asset 0 0
Fair Value, Liability 10,889 4,299
Interest rate swap futures    
Derivative [Line Items]    
Notional, Assets 2,350
Notional, Liabilities 12,235 0
Fair Value, Asset 0 483
Fair Value, Liability $ 31,063 $ 0