BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Feb. 27, 2015	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($) subsidiaries	Dec. 31, 2015 USD ($) subsidiaries	Dec. 31, 2012 USD ($)
Nature Of Business [Line Items]
Period For Other Than Temporary Impairment			1 year
Guaranteed Loans Past Due			2 months 29 days
Period Of Residential Mortgage Loan That Are No Longer Accruing Interest			1 year 3 months	1 year 3 months
Loans Considered To Be Defaulted If Borrower Has Failed To Make Payment For Period Or More Than Period			2 months 29 days	2 months 29 days
Loans Past Due			30 days
Resdiential Mortgage Loans Charge Off			5 months 27 days
Modified Repurchase Agreements Threshold			10.00%
Investment In Subsidiaries Other Real Estate Owned | subsidiaries				2
Wholy Owned Investments Subsidiaries | subsidiaries			2
Base Rate Historical Charge Offs Period				1 year
Cummulative Charge Offs Period				2 years
Troubled Debt Restructurings Sustained Performance Period				6 months
Business Combination Finite Lived Intangible Assets Net			$ 4.4	$ 5.1
Branches Doral	10
Wholy Owned Investments Subsidiaries FirstBank | subsidiaries			6
Business Combination Restrospective Adjustments Threshold			1 year
Rewards liability			$ 7.1	$ 9.6
Discount rate used for calculation of mortgage servicing rights value			14.10%	14.50%
Loan Value Deliquency Threshold To Be Valued At Fair Value Percent			60.00%
Financing receivable, individually evaluated for impairment			$ 1.0
Financing Arrangements With Municipalities Threshold			8 years
Customer Related Intangible Assets Member
Nature Of Business [Line Items]
Finite lived Intangible Assets Acquired 1		$ 1.1
Purchased Credit Card Relationship Intangible [Member]
Nature Of Business [Line Items]
Finite lived Intangible Assets Acquired 1					$ 24.5
Open End Loans [Member]
Nature Of Business [Line Items]
Consumer Loans Charge Off			5 months 27 days
Consumer Auto Loans And Finance Leases [Member]
Nature Of Business [Line Items]
Consumer Loans Reserved			3 months 28 days
Consumer Loans Charge Off			1 year