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, 2017	Dec. 31, 2016
Derivative notional amount and balance sheet location
Assumed Gain on Sale	$ 40,706	$ 62,863
Total Fair Value Adjustment	40,706	62,863
Derivative assets	24,991	61,824
Derivative Liabilities	(500)	(4,396)
Fair Value Adjustment To Loans Held for Sale	16,215	5,435
Loans Held for Sale
Derivative notional amount and balance sheet location
Notional or Principal Amount	1,591,810	1,852,923
Assumed Gain on Sale	27,857	47,019
Interest Rate Movement	(11,642)	(41,584)
Total Fair Value Adjustment	16,215	5,435
Fair Value Adjustment To Loans Held for Sale	16,215	5,435
Rate Lock Commitments
Derivative notional amount and balance sheet location
Notional or Principal Amount	478,118	395,462
Assumed Gain on Sale	12,849	15,844
Interest Rate Movement	(4,309)	(2,275)
Total Fair Value Adjustment	8,540	13,569
Derivative assets	8,540	14,482
Derivative Liabilities		(913)
Forward Sale Contracts
Derivative notional amount and balance sheet location
Notional or Principal Amount	1,950,178	2,248,385
Interest Rate Movement	15,951	43,859
Total Fair Value Adjustment	15,951	43,859
Derivative assets	16,451	47,342
Derivative Liabilities	$ (500)	$ (3,483)