NON-CONSOLIDATED VARIABLE INTEREST ENTITIES AND SERVICING ASSETS - Additional Information (Detail) (USD $)	0 Months Ended	12 Months Ended					1 Months Ended
	Feb. 16, 2011	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2011	Apr. 30, 2004	Sep. 30, 2004
Servicing Liabilities At Fair Value [Line Items]
Principal amount of corporation serviced loans securitized through GNMA				$ 1,100,000,000
Balance of amortization with third party				45,700,000
Carrying value with third party				33,500,000
Percentage of weighted average yield with third party				2.17%
Acquired Equity interest on disposal of loans held for sale	35.00%
Loans acquired on exchange of loan held for sale	136,100,000
Maturity period of loan acquired	7 years 0 months 0 days
Description of loan	30-day LIBOR plus 300 basis points
Estimated life of investment	5 years 0 months 0 days
Equity in losses of unconsolidated entities related to the amortization				1,800,000
Line of credit facility provided to fund unfunded commitments						80,000,000
Working capital line of credit to fund certain expenses					7,000,000	20,000,000
Interest rate on loan provided				30-day LIBOR plus 300 basis points
Revolver agreement of credit facility provided amount outstanding				30,400,000
Working capital line of credit facility provided amount outstanding				0
Percentage of priority interest to be received on invested capital				12.00%
Discount rate use for calculation of fair value investment				17.57%
Percentage of variation in assumptions				10.00%
Debt Instrument Description Of Variable Rate Basis				90-day LIBOR
Percentage Of Trust Preferred Securities That Qualify As Tier1 Capital		0.00%	25.00%
Interest Expense Accrued Trust Preferred Securities				21,900,000
Working Capital Line Expiration Period				2 years 0 months 0 days
Minimum [Member]
Servicing Liabilities At Fair Value [Line Items]
Discount rate use for calculation of fair value investment				10.00%
Maximum [Member]
Servicing Liabilities At Fair Value [Line Items]
Percentage of variation in assumptions				20.00%
Junior Subordinated Deferrable Debentures [Member]
Servicing Liabilities At Fair Value [Line Items]
Junior subordinated deferrable debentures issued							100,000,000	125,000,000
Junior Subordinated Debentures Bearing Interest At Floating Rate Of Two Point Seventy Five [Member]
Servicing Liabilities At Fair Value [Line Items]
Subordinated Borrowing Due Date				Jun. 17, 2034
Junior Subordinated Debentures Bearing Interest At Floating Rate Of Two Point Fifty Percent [Member]
Servicing Liabilities At Fair Value [Line Items]
Subordinated Borrowing Due Date				Sep. 20, 2034
Fbp Statutory Trust One [Member]
Servicing Liabilities At Fair Value [Line Items]
Variable rate trust preferred securities							100,000,000
Proceeds of the issuance, together with proceeds of the purchase							3,100,000
Principal amount of corporation's junior subordinated deferrable debentures							103,100,000
Subordinated Borrowing Due Date				Jun. 17, 2034
Fbp Statutory Trust Two [Member]
Servicing Liabilities At Fair Value [Line Items]
Variable rate trust preferred securities								125,000,000
Proceeds of the issuance, together with proceeds of the purchase								3,900,000
Principal amount of corporation's junior subordinated deferrable debentures								128,900,000
Subordinated Borrowing Due Date				Sep. 20, 2034
Cpg Gs [Member]
Servicing Liabilities At Fair Value [Line Items]
Loans Sold to CPG	269,300,000
Cash realized on sale of loan	88,500,000
Carrying amount of loan provided				$ 25,200,000
Prlp [Member]
Servicing Liabilities At Fair Value [Line Items]
Percentage of ownership investment in unconsolidated entity	65.00%
Payment to be made on pro rata basis				35.00%
FirstBank [Member]
Servicing Liabilities At Fair Value [Line Items]
Payment to be made on pro rata basis				65.00%