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FAIR VALUES OF ASSETS AND LIABILITIES - Significant Unobservable Level 3 Inputs (Details) - Discounted cash flow - Level 3 - Fair Value, Recurring | Sep. 30, 2025 | Dec. 31, 2024
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Residential MBS | Minimum | Constant prepayment rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Servicing asset, measurement input | 0.07 | 0.06
Residential MBS | Minimum | Spread over forward interest rate swap rates |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Servicing asset, measurement input | 0.05 | 0.05
Residential MBS | Maximum | Constant prepayment rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Servicing asset, measurement input | 0.59 | 0.43
Residential MBS | Maximum | Spread over forward interest rate swap rates |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Servicing asset, measurement input | 0.10 | 0.10
Residential MBS | Weighted average | Constant prepayment rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Servicing asset, measurement input | 0.09 | 0.08
Residential MBS | Weighted average | Spread over forward interest rate swap rates |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Servicing asset, measurement input | 0.06 | 0.06
Corporate debt | Minimum | Discount rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.04 | 0.04
Corporate debt | Minimum | Cumulative default |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0 | 0
Corporate debt | Maximum | Discount rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.04 | 0.05
Corporate debt | Maximum | Cumulative default |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.64 | 0.39
Corporate debt | Weighted average | Discount rate |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.04 | 0.05
Corporate debt | Weighted average | Cumulative default |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.04 | 0.04
Corporate debt | Weighted average | Loss given default |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.20 | 0.20

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