FAIR VALUE MEASUREMENTS - Unobservable Inputs Used and Valuation Techniques (Details) - Level 3	Sep. 30, 2025	Dec. 31, 2024
Minimum | Discounted Cash Flow | Constant prepayment rate | Mortgage servicing rights
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights, measurement input	0.0586	0.0508
Minimum | Discounted Cash Flow | Option adjusted spread | Mortgage servicing rights
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights, measurement input	3.98	3.98
Minimum | Internal Model | Pull through rate | Other derivative contracts
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other derivative contracts, measurement input	0.0815	0.0509
Minimum | Internal Model | MSR value | Other derivative contracts
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other derivative contracts, measurement input	0.4230	0.2391
Maximum | Discounted Cash Flow | Constant prepayment rate | Mortgage servicing rights
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights, measurement input	0.1480	0.1632
Maximum | Discounted Cash Flow | Option adjusted spread | Mortgage servicing rights
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights, measurement input	10.58	10.58
Maximum | Internal Model | Pull through rate | Other derivative contracts
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other derivative contracts, measurement input	0.9989	0.9990
Maximum | Internal Model | MSR value | Other derivative contracts
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other derivative contracts, measurement input	1.7100	1.7164
Weighted Average | Discounted Cash Flow | Constant prepayment rate | Mortgage servicing rights
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights, measurement input	0.0710	0.0670
Weighted Average | Discounted Cash Flow | Option adjusted spread | Mortgage servicing rights
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights, measurement input	6.08	6.32
Weighted Average | Internal Model | Pull through rate | Other derivative contracts
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other derivative contracts, measurement input	0.8307	0.8306
Weighted Average | Internal Model | MSR value | Other derivative contracts
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other derivative contracts, measurement input	1.2476	1.2123