FAIR VALUE MEASUREMENTS - Schedule of Fair Value of Derivative Instruments and Loans Held for Sale (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Derivative notional amount and balance sheet location
Assumed Gain on Sale	$ 62,863	$ 29,575
Total Fair Value Adjustment	62,863	29,575
Derivative assets	61,824	11,678
Derivative Liabilities	(4,396)	(1,333)
Fair Value Adjustment To Loans Held for Sale	5,435	19,231
Loans Held for Sale
Derivative notional amount and balance sheet location
Notional or Principal Amount	1,852,923	2,479,880
Assumed Gain on Sale	47,019	20,108
Interest Rate Movement	(41,584)	(877)
Total Fair Value Adjustment	5,435	19,231
Fair Value Adjustment To Loans Held for Sale	5,435	19,231
Rate Lock Commitments
Derivative notional amount and balance sheet location
Notional or Principal Amount	395,462	267,710
Assumed Gain on Sale	15,844	9,467
Interest Rate Movement	(2,275)	(1,494)
Total Fair Value Adjustment	13,569	7,973
Derivative assets	14,482	7,973
Derivative Liabilities	(913)
Forward Sale Contracts
Derivative notional amount and balance sheet location
Notional or Principal Amount	2,248,385	2,747,590
Interest Rate Movement	43,859	2,371
Total Fair Value Adjustment	43,859	2,371
Derivative assets	47,342	3,705
Derivative Liabilities	$ (3,483)	$ (1,333)