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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% |  |  |  |

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