FAIR VALUES OF ASSETS AND LIABILITIES - Significant Unobservable Level 3 Inputs (Details) - Discounted cash flow - Level 3	Jun. 30, 2026	Dec. 31, 2025
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	0.64	0.61
Residential MBS \| Maximum \| Spread over forward interest rate swap rates
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Servicing asset, measurement input	0.11	0.11
Residential MBS \| Weighted average \| Constant prepayment rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Servicing asset, measurement input	0.08	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	0.05	0.05
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	0.05	0.04
Corporate debt \| Maximum \| Cumulative default
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt securities, available-for-sale, measurement input	0.64	0.64
Corporate debt \| Weighted average \| Discount rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt securities, available-for-sale, measurement input	0.04	0.04
Corporate debt \| Weighted average \| Cumulative default
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt securities, available-for-sale, measurement input	0.03	0.03
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