FAIR VALUE MEASUREMENTS - Unobservable Inputs Used and Valuation Techniques (Details) - Level 3	Mar. 31, 2023
Minimum | Discounted Cash Flow | Constant prepayment rate | Mortgage servicing rights
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights, measurement input	0.0620
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
Minimum | Internal Model | Pull through rate | Other derivative contracts
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other derivative contracts, measurement input	0.0867
Minimum | Internal Model | MSR value | Other derivative contracts
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other derivative contracts, measurement input	(0.1411)
Maximum | Discounted Cash Flow | Constant prepayment rate | Mortgage servicing rights
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights, measurement input	0.1780
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
Maximum | Internal Model | Pull through rate | Other derivative contracts
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other derivative contracts, measurement input	0.9970
Maximum | Internal Model | MSR value | Other derivative contracts
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other derivative contracts, measurement input	1.4145
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	0.0730
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	6.28
Weighted Average | Internal Model | Pull through rate | Other derivative contracts
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other derivative contracts, measurement input	0.7785
Weighted Average | Internal Model | MSR value | Other derivative contracts
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other derivative contracts, measurement input	0.7573