LOAN COMMITMENTS AND OTHER RELATED ACTIVITIES - Additional Information (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2016 USD ($)
Other Commitments [Line Items]
Commitments to make loans, period, maximum	30 days
Commitments to sell loans under residential mortgage division	$ 1,140.0
TBAs commitments
Other Commitments [Line Items]
Commitments to sell loans under residential mortgage division	1,090.0
Best efforts commitments
Other Commitments [Line Items]
Commitments to sell loans under residential mortgage division	45.4
Interest rate lock commitments
Other Commitments [Line Items]
Commitments to sell loans under residential mortgage division	543.3
Jumbo SFR mortgage loan sale commitments
Other Commitments [Line Items]
Commitments to sell loans under residential mortgage division	67.6
Foreign exchange contracts
Other Commitments [Line Items]
Commitments to sell loans under residential mortgage division	$ 20.8