FAIR VALUE DISCLOSURES OF FINANCIAL ASSETS AND LIABILITIES - Fair Value Measurement Inputs and Valuation Techniques (Details) - Significant Unobservable Inputs (Level 3) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($)
Observed market comparable transactions
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other investments	$ 10,227
Fair market value of collateral
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other real estate owned	$ 2,068
Fair market value of collateral | Costs to sell
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other real estate owned	0.100
Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other liabilities	$ 22,871
Discounted cash flow | Timing of the resolution of the Visa litigation | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other liabilities	2 years 6 months
Discounted cash flow | Timing of the resolution of the Visa litigation | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other liabilities	7 years 6 months
Discounted cash flow | Timing of the resolution of the Visa litigation | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other liabilities	5 years 3 months