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NON-CONSOLIDATED VARIABLE INTEREST ENTITIES (VIEs) AND SERVICING ASSETS - Additional Information (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |
Servicing Asset at Amortized Cost | $ 23,659 | $ 25,019 | $ 24,130 | $ 25,403 | $ 25,952 | $ 26,941
Servicing Asset At Fair Value Amount | $ 41,710 | 43,046 |  |  |  |
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 | $ 658 | 521 | 513 | 526 | 549 | 511
Junior subordinated debentures (amortized cost) | 0 | 61,700 |  |  |  |
Parent Company [Member] |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |
Junior subordinated debentures (amortized cost) | $ 0 | 61,700 |  |  |  |
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] | Parent Company [Member] | Trust Preferred Securities [Member] |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |
Trust preferred securities redemption call price percent | 100.00% |  |  |  |  |
Repurchased face amount | $ 61,700 |  |  |  |  |
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 |  |  |  |
Residential MBS [Member] |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 330 | 176 |  |  |  |
Residential MBS [Member] | Private label [Member] |  |  |  |  |  |
Servicing Liabilities At Fair Value [Line Items] |  |  |  |  |  |
Servicing Asset at Amortized Cost | 5,300 | 6,100 |  |  |  |
Servicing Asset At Fair Value Amount | 3,300 | 4,200 |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 330 | $ 176 | $ 176 | $ 176 | $ 163 | $ 116
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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