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NON-CONSOLIDATED VARIABLE INTEREST ENTITIES AND SERVICING ASSETS - additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 16, 2011 | Sep. 30, 2004 | Apr. 30, 2004 | Jun. 30, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2016 | Jun. 30, 2019 | Jun. 30, 2018 | Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gains Losses On Extinguishment Of Debt |  |  |  | $ 0 | $ 0 |  |  | $ 0 | $ 2,316 |  |  |
Interest Expense Accrued Trust Preferred Securities |  |  |  |  |  |  | $ 31,200 |  |  |  |  |
Carrying amount of servicing assets |  |  |  | 27,231 | 27,191 | $ 26,135 |  | 27,231 | 27,191 | $ 27,431 | $ 27,428 | $ 25,255
Grantor Trust Fair Value |  |  |  | $ 30,396 |  |  |  | $ 30,396 |  |  |  |
Weighted-average yield |  |  |  | 2.53% |  |  |  | 2.53% |  |  | 2.55% |
Loans sold to CPG |  |  |  |  |  |  |  | $ 0 | 558 |  |  |
Loans and Leases Receivable, Gross |  |  |  | $ 9,113,955 | $ 8,640,291 |  |  | $ 9,113,955 | $ 8,640,291 |  | $ 8,858,123 |
Percentage Of Variation In Assumptions |  |  |  |  |  |  |  | 10.00% |  |  |  |
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 |  |  |  |
Mortgage-backed Securities, Issued by Private Enterprises [Member] |  |  |  |  |  |  |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Description Of Variable Rate Basis |  |  |  |  |  |  |  | 90-day LIBOR |  |  |  |
Carrying amount of servicing assets |  |  |  | 17,900 |  |  |  | $ 17,900 |  |  |  |
Grantor Trust Fair Value |  |  |  | $ 12,500 |  |  |  | $ 12,500 |  |  |  |
Weighted-average yield |  |  |  | 4.39% |  |  |  | 4.39% |  |  |  |
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% |  |  |  |
Cpg Gs [Member] |  |  |  |  |  |  |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  |  |  |  |  |  |  | three-year maturity |  |  |  |
Loans sold to CPG | $ 269,300 |  |  |  |  |  |  |  |  |  |  |
Cash realized on sale of loan | 88,500 |  |  |  |  |  |  |  |  |  |  |
Loans and Leases Receivable, Gross | $ 136,100 |  |  | $ 400 |  |  |  | $ 400 |  |  |  |
Cpg Gs [Member] | FirstBank [Member] |  |  |  |  |  |  |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquired Equity interest on disposal of loans held for sale | 35.00% |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |
Minimum [Member] | Prlp [Member] |  |  |  |  |  |  |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage Of Priority Interest To Be Received On Invested Capital |  |  |  |  |  |  |  | 12.00% |  |  |  |
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 |  |  |  |  |  |
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 TRuPs). |  |  |  |
Variable Rate Demand Obligation [Member] | Fbp Statutory Trust One [Member] |  |  |  |  |  |  |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Trust Preferred Securities |  |  | $ 100,000 |  |  |  |  |  |  |  |  |
Proceeds of the purchase of FBP Statury Trust |  |  | 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 |  |  |  |  |  |  |  |  |
Variable Rate Demand Obligation [Member] | Fbp Statutory Trust Two [Member] |  |  |  |  |  |  |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Trust Preferred Securities |  | $ 125,000 |  |  |  |  |  |  |  |  |  |
Proceeds of the purchase of FBP Statury Trust |  | 3,900 |  |  |  |  |  |  |  |  |  |
Variable Rate Demand Obligation [Member] | Fbp Statutory Trust Two [Member] | Junior Subordinated Deferrable Debentures [Member] |  |  |  |  |  |  |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of corporation's junior subordinated deferrable debentures |  | $ 128,900 |  |  |  |  |  |  |  |  |  |
GNMA [Member] |  |  |  |  |  |  |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of corporation serviced loans securitized through GNMA |  |  |  | $ 1,800,000 |  |  |  | $ 1,800,000 |  |  |  |

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Data Type: | na
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