FAIR VALUE MEASUREMENTS - Schedule of Fair Value of Derivative Instruments and Loans Held for Sale (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Derivative notional amount and balance sheet location
Estimated Gain on Sale	$ 72,252	$ 28,025
Total Fair Value Adjustment	72,252	28,025
Derivative assets	27,085	15,568
Derivative Liabilities	(13,739)	(36)
Fair Value Adjustment to Loans Held for Sale	58,906	12,493
Loans Held for Sale
Derivative notional amount and balance sheet location
Notional or Principal Amount	1,674,692	774,542
Estimated Gain on Sale	47,340	15,826
Interest Rate Movement	11,566	(3,333)
Total Fair Value Adjustment	58,906	12,493
Fair Value Adjustment to Loans Held for Sale	58,906	12,493
Rate Lock Commitments
Derivative notional amount and balance sheet location
Notional or Principal Amount	945,009	511,114
Estimated Gain on Sale	24,912	12,199
Interest Rate Movement	1,097	(1,975)
Total Fair Value Adjustment	26,009	10,224
Derivative assets	26,057	10,247
Derivative Liabilities	(48)	(23)
Forward Sale Contracts
Derivative notional amount and balance sheet location
Notional or Principal Amount	2,619,701	1,285,656
Interest Rate Movement	(12,663)	5,308
Total Fair Value Adjustment	(12,663)	5,308
Derivative assets	1,028	5,321
Derivative Liabilities	$ (13,691)	$ (13)