FAIR VALUE MEASUREMENTS - Schedule of Fair Value of Derivative Instruments and Loans Held for Sale (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Derivative notional amount and balance sheet location
Estimated Gain on Sale	$ 76,108	$ 28,025
Total Fair Value Adjustment	76,108	28,025
Derivative assets	158,233	15,568
Derivative Liabilities	(172,623)	(36)
Fair Value Adjustment To Loans Held for Sale	90,498	12,493
Loans Held for Sale
Derivative notional amount and balance sheet location
Notional or Principal Amount	1,096,079	774,542
Estimated Gain on Sale	26,633	15,826
Interest Rate Movement	63,865	(3,333)
Total Fair Value Adjustment	90,498	12,493
Fair Value Adjustment To Loans Held for Sale	90,498	12,493
Rate Lock Commitments
Derivative notional amount and balance sheet location
Notional or Principal Amount	2,824,387	511,114
Estimated Gain on Sale	49,475	12,199
Interest Rate Movement	108,151	(1,975)
Total Fair Value Adjustment	157,626	10,224
Derivative assets	157,642	10,247
Derivative Liabilities	(16)	(23)
Forward Sale Contracts
Derivative notional amount and balance sheet location
Notional or Principal Amount	3,920,466	1,285,656
Interest Rate Movement	(172,016)	5,308
Total Fair Value Adjustment	(172,016)	5,308
Derivative assets	591	5,321
Derivative Liabilities	$ (172,607)	$ (13)