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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
Mar. 31, 2018
Jun. 30, 2016
Servicing Liabilities At Fair Value [Line Items]          
Principal amount of corporation serviced loans securitized through GNMA       $ 1,700.0  
Balance of amortization with third party       21.3  
Carrying value with third party       $ 16.1  
Percentage of weighted average yield with third party       4.49%  
Maturity period of loan acquired 7 years        
Percentage of priority interest to be received on invested capital       12.00%  
Payment to be made on pro rata basis       65.00%  
Percentage of variation in assumptions       10.00%  
Debt Instrument Description Of Variable Rate Basis       90-day LIBOR  
Interest Expense Accrued Trust Preferred Securities         $ 31.2
Trust Preferred Securities Repurchases       $ 23.8  
Trust Preferred Securties Discount       10.00%  
Trust Preferred Securities Winning Bid       90.00%  
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    
Subordinated Borrowing Due Date       Jun. 17, 2034  
Fbp Statutory Trust Two [Member]          
Servicing Liabilities At Fair Value [Line Items]          
Variable rate trust preferred securities   $ 125.0      
Proceeds of the issuance, together with proceeds of the purchase   3.9      
Principal amount of corporation's junior subordinated deferrable debentures   $ 128.9      
Subordinated Borrowing Due Date       Sep. 20, 2034  
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       $ 4.1  
Line of credit facility provided to fund unfunded commitments $ 80.0        
Working capital line of credit to fund certain expenses $ 20.0        
Revolver agreement of credit facility provided amount outstanding       $ 6.8  
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%