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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 | Apr. 30, 2004 | Sep. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Jun. 30, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2014 | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2004
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of corporation serviced loans securitized through GNMA |  |  | $ 1,700,000 |  |  |  | $ 1,700,000 |  |  |  |  |  |  |
Gains Losses On Extinguishment Of Debt |  |  | 0 |  | $ 1,391 |  | 2,316 | $ 1,391 |  |  |  |  |  |
Carrying amount of servicing assets |  |  | 27,593 |  | 25,999 |  | 27,593 | 25,999 |  | $ 27,191 | $ 25,255 | $ 26,502 | $ 26,244 |
Grantor Trust Fair Value |  |  | 32,304 |  |  |  | 32,304 |  |  | $ 27,191 | 25,255 | $ 26,502 | $ 26,244 |
Interest Expense Accrued Trust Preferred Securities |  |  |  |  |  | $ 31,200 |  |  |  |  |  |  |  |
Loans And Leases Receivable Gross Carrying Amount |  |  | $ 8,716,953 |  | $ 8,877,214 |  | 8,716,953 | $ 8,877,214 |  |  | $ 8,850,476 |  |  |
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Qualitative Information |  |  | These sensitivities are hypothetical and should be used with caution. As the figures indicate, changes in fair value based on a 10% variation in assumptions generally cannot be extrapolated because the relationship between the change in assumption and the change in fair value may not be linear. Also, in this table, the effect of a variation in a particular assumption on the fair value of the servicing asset is calculated without changing any other assumption; in reality, changes in one factor may result in changes in another (for example, increases in market interest rates may result in lower prepayments), which may magnify or counteract the sensitivities |  |  |  |  |  |  |  |  |  |  |
Prlp [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |  |
Fbp Statutory Trust One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trust Preferred Securities Repurchases |  |  |  | $ 23,800 |  |  |  |  |  |  |  |  |  |
Trust Preferred Securities Winning Bid |  |  |  | 90.00% |  |  |  |  |  |  |  |  |  |
Trust Preferred Securties Discount |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |
Fbp Statutory Trust One [Member] | Trust Preferred Securities Subject to Mandatory Redemption [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gains Losses On Extinguishment Of Debt |  |  |  | $ 2,300 |  |  |  |  |  |  |  |  |  |
Fbp Statutory Trust One [Member] | Junior Subordinated Deferrable Debentures [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trust Preferred Securities Repurchases |  |  |  | $ 23,800 |  |  |  |  |  |  |  |  |  |
Debt Instrument Face Amount |  | $ 103,100 |  |  |  |  |  |  |  |  |  |  |  | $ 128,900
Cpg Gs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans sold to CPG | $ 269,300 |  |  |  |  |  |  |  |  |  |  |  |  |
Loans And Leases Receivable Gross Carrying Amount | 136,100 |  | $ 8,400 |  |  |  | 8,400 |  |  |  |  |  |  |
Cash realized on sale of loan | $ 88,500 |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount of the Bank investment in CPG/GS |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |
Cpg Gs [Member] | FirstBank [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Equity interest on disposal of loans held for sale | 35.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum [Member] | Prlp [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage Of Priority Interest To Be Received On Invested Capital |  |  | 12.00% |  |  |  |  |  |  |  |  |  |  |
Mortgage pass through trust certificates [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Description Of Variable Rate Basis |  |  | 90-day LIBOR |  |  |  |  |  |  |  |  |  |  |
Carrying amount of servicing assets |  |  | $ 20,000 |  |  |  | 20,000 |  |  |  |  |  |  |
Grantor Trust Fair Value |  |  | $ 14,600 |  |  |  | $ 14,600 |  |  |  |  |  |  |
Percentage of weighted average yield with third party |  |  | 4.57% |  |  |  |  |  |  |  |  |  |  |
Variable Rate Demand Obligation [Member] | Junior Subordinated Deferrable Debentures [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  |  | The Junior Subordinated Deferrable Debentures issued by the Corporation in April 2004 and September 2004 mature on June 17, 2034 and September 20, 2034, respectively; however, under certain circumstances, the maturity of Junior Subordinated Deferrable Debentures may be shortened (such shortening would result in a mandatory redemption of the variable-rate trust-preferred securities). |  |  |  |  |  |  |  |  |  |  |
Variable Rate Demand Obligation [Member] | 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 |  |  |  |  |  |  |  |  |  |  |  |
Variable Rate Demand Obligation [Member] | Fbp Statutory Trust One [Member] | Junior Subordinated Deferrable Debentures [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of corporation's junior subordinated deferrable debentures |  | $ 103,100 |  |  |  |  |  |  |  |  |  |  |  |

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