FAIR VALUE DISCLOSURES OF FINANCIAL ASSETS AND LIABILITIES - Fair Value Measurement Inputs and Valuation Techniques (Details) - Significant Unobservable Inputs (Level 3) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)
Observed market comparable transactions
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other investments	$ 10,436
Fair market value of collateral
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other real estate owned	$ 3,000
Fair market value of collateral | Costs to sell | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other real estate owned	0.050
Fair market value of collateral | Costs to sell | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other real estate owned	0.100
Fair market value of collateral | Costs to sell | Weighted Average
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	$ 25,205
Discounted cash flow | Timing of the resolution of the Visa litigation | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other liabilities	3 years
Discounted cash flow | Timing of the resolution of the Visa litigation | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other liabilities	8 years
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 9 months