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, 2017	Dec. 31, 2016
Derivative notional amount and balance sheet location
Assumed Gain on Sale	$ 37,039	$ 62,863
Total Fair Value Adjustment	37,039	62,863
Derivative assets	15,446	61,824
Derivative Liabilities	(9,449)	(4,396)
Fair Value Adjustment To Loans Held for Sale	31,042	5,435
Loans Held for Sale
Derivative notional amount and balance sheet location
Notional or Principal Amount	1,199,269	1,852,923
Assumed Gain on Sale	24,116	47,019
Interest Rate Movement	6,926	(41,584)
Total Fair Value Adjustment	31,042	5,435
Fair Value Adjustment To Loans Held for Sale	31,042	5,435
Rate Lock Commitments
Derivative notional amount and balance sheet location
Notional or Principal Amount	481,351	395,462
Assumed Gain on Sale	12,923	15,844
Interest Rate Movement	1,289	(2,275)
Total Fair Value Adjustment	14,212	13,569
Derivative assets	14,212	14,482
Derivative Liabilities		(913)
Forward Sale Contracts
Derivative notional amount and balance sheet location
Notional or Principal Amount	1,680,620	2,248,385
Interest Rate Movement	(8,215)	43,859
Total Fair Value Adjustment	(8,215)	43,859
Derivative assets	1,234	47,342
Derivative Liabilities	$ (9,449)	$ (3,483)