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NON-CONSOLIDATED VARIABLE INTEREST ENTITIES AND SERVICING ASSETS - Additional Information (Detail) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Feb. 16, 2011
Sep. 30, 2004
Apr. 30, 2004
Mar. 31, 2018
Mar. 31, 2016
Jun. 30, 2015
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2011
Jun. 30, 2016
Servicing Liabilities At Fair Value [Line Items]                        
Principal amount of corporation serviced loans securitized through GNMA               $ 1,600,000        
Balance of amortization with third party               22,800        
Carrying value with third party               $ 17,100        
Percentage of weighted average yield with third party               2.44%        
Acquired Equity interest on disposal of loans held for sale 35.00%                      
Loans acquired on exchange of loan held for sale $ 136,100                      
Maturity period of loan acquired 7 years                      
Description of loan 30-day LIBOR plus 300 basis points                      
Line of credit facility provided to fund unfunded commitments                     $ 80,000  
Working capital line of credit to fund certain expenses                     $ 20,000  
Interest rate on loan provided               30-day LIBOR plus 300 basis points        
Revolver agreement of credit facility provided amount outstanding               $ 6,700        
Percentage of priority interest to be received on invested capital               12.00%        
Percentage of variation in assumptions               10.00%        
Debt Instrument Description Of Variable Rate Basis               90-day LIBOR        
Interest Expense Accrued Trust Preferred Securities                       $ 31,200
Conversion Of Stock Shares Issued1           852,831            
Common Stock Issued In Exchange For Trust Preferred Securities Value               $ 0 $ 0 $ 5,628    
Trust Preferred Securities Exchanged Liquidation Value               $ 0 $ 0 $ 5,303    
Trust Preferred Securities Repurchases       $ 23,800 $ 10,000   $ 7,300          
Trust Preferred Securties Discount       10.00% 30.00%   19.00%          
Trust Preferred Securities Winning Bid       90.00% 70.00%   81.00%          
Minimum [Member]                        
Servicing Liabilities At Fair Value [Line Items]                        
Percentage of variation in assumptions               10.00%        
Maximum [Member]                        
Servicing Liabilities At Fair Value [Line Items]                        
Percentage of variation in assumptions               20.00%        
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                  
Proceeds of the issuance, together with proceeds of the purchase     3,100                  
Principal amount of corporation's junior subordinated deferrable debentures     $ 103,100                  
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                    
Proceeds of the issuance, together with proceeds of the purchase   3,900                    
Principal amount of corporation's junior subordinated deferrable debentures   $ 128,900                    
Subordinated Borrowing Due Date               Sep. 20, 2034        
Cpg Gs [Member]                        
Servicing Liabilities At Fair Value [Line Items]                        
Loans Sold to CPG $ 269,300                      
Cash realized on sale of loan $ 88,500                      
Carrying amount of loan provided               $ 4,000        
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%