NON-CONSOLIDATED VARIABLE INTEREST ENTITIES AND SERVICING ASSETS - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended			3 Months Ended		12 Months Ended
	Feb. 16, 2011	Sep. 30, 2004	Apr. 30, 2004	Mar. 31, 2016	Jun. 30, 2015	Dec. 31, 2013
Servicing Liabilities At Fair Value [Line Items]
Principal amount of corporation serviced loans securitized through GNMA				$ 1,300.0
Balance of amortization with third party				33.0
Carrying value with third party				$ 24.5
Percentage of weighted average yield with third party				2.34%
Percentage of priority interest to be received on invested capital				12.00%
Payment to be made on pro rata basis				65.00%
Debt Instrument Description Of Variable Rate Basis				90-day LIBOR
Working Capital Line Expiration Period				2 years
Interest Expense Accrued Trust Preferred Securities				$ 29.4
Conversion Of Stock Shares Issued1					852,831
Trust Preferred Securities Exchanged Liquidation Value					$ 5.3
Trust Preferred Securities Repurchases				$ 10.0
Trust Preferred Securties Discount				30.00%
Trust Preferred Securities Winning Bid				70.00%
Common Stock Issued In Exchange For Trust Preferred Securities Additional Paid In Capital Value					$ 5.5
Maximum [Member]
Servicing Liabilities At Fair Value [Line Items]
Percentage of variation in assumptions				20.00%
Minimum [Member]
Servicing Liabilities At Fair Value [Line Items]
Percentage of variation in assumptions				10.00%
Fbp Statutory Trust One [Member]
Servicing Liabilities At Fair Value [Line Items]
Variable rate trust preferred securities			$ 100.0
Proceeds of the issuance, together with proceeds of the purchase			3.1
Principal amount of corporation's junior subordinated deferrable debentures			$ 103.1
Fbp Statutory Trust Two [Member]
Servicing Liabilities At Fair Value [Line Items]
Variable rate trust preferred securities		$ 125.0
Proceeds of the issuance, together with proceeds of the purchase		3.9
Principal amount of corporation's junior subordinated deferrable debentures		$ 128.9
Cpg Gs [Member]
Servicing Liabilities At Fair Value [Line Items]
Loans Sold to CPG	$ 269.3
Cash realized on sale of loan	88.5
Loans acquired on exchange of loan held for sale	$ 136.1
Description of loan	30-day LIBOR plus 300 basis points 30-day LIBOR plus 300 basis points
Carrying amount of loan provided				$ 8.9
Line of credit facility provided to fund unfunded commitments	$ 80.0
Working capital line of credit to fund certain expenses	$ 20.0					$ 7.0
Revolver agreement of credit facility provided amount outstanding				15.1
Working capital line of credit facility provided amount outstanding				$ 3.7
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]
Acquired Equity interest on disposal of loans held for sale	35.00%