NON-CONSOLIDATED VARIABLE INTEREST ENTITIES AND SERVICING ASSETS - additional Information (Detail) - USD ($) $ in Millions	1 Months Ended			3 Months Ended
	Feb. 16, 2011	Sep. 30, 2004	Apr. 30, 2004	Sep. 30, 2017	Mar. 31, 2016	Jun. 30, 2015	Jun. 30, 2016
Servicing Liabilities At Fair Value [Line Items]
Principal amount of corporation serviced loans securitized through GNMA				$ 1,600.0
Balance of amortization with third party				23.6
Carrying value with third party				$ 17.6
Percentage of weighted average yield with third party				2.38%
Maturity period of loan acquired	7 years
Working capital line of credit to fund certain expenses	$ 20.0
Payment to be made on pro rata basis				65.00%
Debt Instrument Description Of Variable Rate Basis				90-day LIBOR
Interest Expense Accrued Trust Preferred Securities							$ 31.2
Conversion Of Stock Shares Issued1						852,831
Trust Preferred Securities Exchanged Liquidation Value						$ 5.3
Trust Preferred Securities Winning Bid					70.00%
Common Stock Issued In Exchange For Trust Preferred Securities Additional Paid In Capital Value						$ 5.5
Trust Preferred Securities Purchase Price				81.00%
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
Trust Preferred Securities Repurchases				$ 7.3
Trust Preferred Securties Discount				19.00%
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
Trust Preferred Securities Repurchases					$ 10.0
Trust Preferred Securties Discount					30.00%
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
Carrying amount of loan provided				$ 4.0
Line of credit facility provided to fund unfunded commitments	$ 80.0
Revolver agreement of credit facility provided amount outstanding				$ 6.7
Prlp [Member]
Servicing Liabilities At Fair Value [Line Items]
Percentage of ownership investment in unconsolidated entity	65.00%
Percentage of priority interest to be received on invested capital				12.00%
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%