MORTGAGE BANKING ACTIVITIES - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Originations of loans held for sale from mortgage banking	$ 1,520,000	$ 1,130,000	$ 3,824,562	$ 3,404,030
Proceeds from sale of mortgage loans held-for-sale	1,460,000	1,190,000	3,740,000	3,330,000
Net gain on sale of mortgage loans held for sale	$ 44,900	$ 32,900	$ 113,500	$ 102,100
Margin on sale of mortgage loans held for sale	2.95%	2.92%	2.97%	3.00%
Loan origination fees	$ 5,300	$ 4,100	$ 14,100	$ 12,200
Loans sold	13,700	11,600	34,600	35,100
Representations and Warranties Obligations and Corporate Guarantees
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Provision for loss reimbursement on sold loans	1,241	716	2,471	3,617
Initial provision for loan repurchases	1,200	537	2,900	1,600
Write off of initial estimate	$ 49	$ 179	$ (451)	$ 2,000