FAIR VALUE MEASUREMENTS - Schedule of Fair Value of Derivative Instruments and Loans Held for Sale (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Derivative notional amount and balance sheet location
Estimated Gain on Sale	$ 28,025	$ 41,684
Total Fair Value Adjustment	28,025	41,684
Derivative assets	15,568	35,536
Derivative Liabilities	(36)	(32,697)
Fair Value Adjustment To Loans Held for Sale	12,493	38,845
Loans Held for Sale
Derivative notional amount and balance sheet location
Notional or Principal Amount	774,542	1,035,503
Estimated Gain on Sale	15,826	21,399
Interest Rate Movement	(3,333)	17,446
Total Fair Value Adjustment	12,493	38,845
Fair Value Adjustment To Loans Held for Sale	12,493	38,845
Rate Lock Commitments
Derivative notional amount and balance sheet location
Notional or Principal Amount	511,114	891,514
Estimated Gain on Sale	12,199	20,285
Interest Rate Movement	(1,975)	10,627
Total Fair Value Adjustment	10,224	30,912
Derivative assets	10,247	30,976
Derivative Liabilities	(23)	(64)
Forward Sale Contracts
Derivative notional amount and balance sheet location
Notional or Principal Amount	1,285,656	1,927,017
Interest Rate Movement	5,308	(28,073)
Total Fair Value Adjustment	5,308	(28,073)
Derivative assets	5,321	4,560
Derivative Liabilities	$ (13)	$ (32,633)