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NON-CONSOLIDATED VARIABLE INTEREST ENTITIES AND SERVICING ASSETS - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 16, 2011 | Apr. 30, 2004 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |
Servicing Asset at Amortized Cost |  |  | $ 29,690 | $ 30,277 | $ 30,986 | $ 31,685 | $ 32,335 | $ 33,071
Servicing Asset At Fair Value Amount |  |  | $ 44,621 |  | $ 42,132 |  |  |
Weighted-average yield |  |  | 1.21% |  | 1.03% |  |  |
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 MSR 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. |  |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss |  |  | $ 664 |  | $ 1,105 |  |  |
Junior subordinated debentures |  |  | $ 183,762 |  | $ 183,762 |  |  |
Prlp [Member] |  |  |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |
Payment To Be Made On Pro Rata Basis |  |  | 65.00% |  |  |  |  |
Prlp [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |
Percentage Of Priority Interest To Be Received On Invested Capital |  |  | 12.00% |  |  |  |  |
CPG/GS [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |
Loans held for sale sold | $ 269,300 |  |  |  |  |  |  |
Loans and Leases Receivable, Gross | 136,100 |  |  |  |  |  |  |
CPG/GS [Member] | Commercial Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] |  |  |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |
Cash realized on sale of loan | $ 88,500 |  |  |  |  |  |  |
Acquired equity interest | 35.00% |  |  |  |  |  |  |
CPG/GS [Member] | Prlp [Member] |  |  |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |
Payment To Be Made On Pro Rata Basis |  |  | 35.00% |  |  |  |  |
Variable Rate Demand Obligation [Member] | Junior Subordinated Debt [Member] |  |  |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  |  | The Junior Subordinated Deferrable Debentures 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). As of each of September 30, 2022 and December 31, 2021, these Junior Subordinated Deferrable Debentures amounted to $183.8 million. |  |  |  |  |
Variable Rate Demand Obligation [Member] | Statutory Trust One [Member] |  |  |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |
Proceeds from Issuance of 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 |  |  |  |  |  |
Variable Rate Demand Obligation [Member] | Statutory Trust Two [Member] |  |  |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |
Proceeds from Issuance of 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 |  |  |  |  |  |
MBS [Member] |  |  |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |
Weighted-average yield |  |  | 1.49% |  | 1.26% |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss |  |  | $ 290 |  | $ 797 |  |  |
MBS [Member] | Private label [Member] |  |  |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |
Servicing Asset at Amortized Cost |  |  | 8,600 |  |  |  |  |
Servicing Asset At Fair Value Amount |  |  | $ 6,200 |  |  |  |  |
Weighted-average yield |  |  | 5.93% |  |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss |  |  | $ 300 |  | $ 800 |  |  |
MBS [Member] | Private label [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |
Debt Instrument Description Of Variable Rate Basis |  |  | 3-month LIBOR |  |  |  |  |
GNMA [Member] |  |  |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |
Principal amount of corporation serviced loans securitized through GNMA |  |  | $ 2,100,000 |  |  |  |  |

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