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NON-CONSOLIDATED VARIABLE INTEREST ENTITIES (VIEs) AND SERVICING ASSETS - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2004 | Sep. 30, 2023 | Jun. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022 | Jun. 30, 2022 | Dec. 31, 2021
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Gain on early extinguishment of debt |  | $ 0 |  | $ 0 | $ 1,605 | $ 0 |  |  |
Servicing Asset at Amortized Cost |  | 27,601 | $ 28,034 | 29,690 | 27,601 | 29,690 | $ 29,037 | $ 30,277 | $ 30,986
Servicing Asset At Fair Value Amount |  | $ 45,114 |  |  | $ 45,114 |  | $ 44,710 |  |
Weighted-average yield |  | 1.24% |  |  | 1.24% |  | 1.22% |  |
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 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 |  | $ 465 | 433 | 664 | $ 465 | 664 | $ 458 | 676 | 1,105
Junior subordinated debentures |  | $ 161,700 |  |  | $ 161,700 |  | $ 183,762 |  |
Statutory Trust One [Member] |  |  |  |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Trust preferred securities repurchased |  |  | $ 21,400 |  |  |  |  |  |
Trust Preferred Purchase Price Percent |  |  | 92.50% |  |  |  |  |  |
Trust Preferred Securities Discount |  |  | 7.50% |  |  |  |  |  |
Gain on early extinguishment of debt |  |  | $ 1,600 |  |  |  |  |  |
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 Debt [Member] | Secured Overnight Financing Rate Sofr Overnight Index Swap Rate [Member] |  |  |  |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Spread on variable rate |  |  |  |  | 0.26161% |  |  |  |
Debt Instrument Description Of Variable Rate Basis |  |  |  |  | 3-month CME Term SOFR |  |  |  |
Junior Subordinated Debt [Member] | Secured Overnight Financing Rate Sofr Overnight Index Swap Rate [Member] | Statutory Trust One [Member] |  |  |  |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Spread on variable rate |  |  |  |  | 2.75% |  |  |  |
Junior Subordinated Debt [Member] | Secured Overnight Financing Rate Sofr Overnight Index Swap Rate [Member] | Statutory Trust Two [Member] |  |  |  |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Spread on variable rate |  |  |  |  | 2.50% |  |  |  |
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 |  |  |  |  |  |  |  |
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). |  |  |  |
Residential MBS [Member] |  |  |  |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Weighted-average yield |  | 1.54% |  |  | 1.54% |  | 1.52% |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss |  | $ 83 |  |  | $ 83 |  | $ 83 |  |
Residential MBS [Member] | Private label [Member] |  |  |  |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Weighted-average yield |  | 7.73% |  |  | 7.73% |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss |  | $ 100 |  |  | $ 100 |  | 100 |  |
Residential MBS [Member] | Secured Overnight Financing Rate Sofr Overnight Index Swap Rate [Member] | Private label [Member] |  |  |  |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Spread on variable rate |  |  |  |  | 0.26161% |  |  |  |
Debt Instrument Description Of Variable Rate Basis |  |  |  |  | 3-month CME Term SOFR |  |  |  |
Residential MBS [Member] | Private label [Member] |  |  |  |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Servicing Asset at Amortized Cost |  | 7,300 |  |  | $ 7,300 |  |  |  |
Servicing Asset At Fair Value Amount |  | 4,900 |  |  | 4,900 |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss |  | 83 | $ 83 | $ 290 | 83 | $ 290 | $ 83 | $ 290 | $ 797
GNMA [Member] |  |  |  |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Principal amount of corporation serviced loans securitized through GNMA |  | $ 2,100,000 |  |  | $ 2,100,000 |  |  |  |

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