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FAIR VALUE MEASUREMENT - Schedule of Level 3 Unobservable Inputs (Details) $ in Thousands	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Interest rate lock commitments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate lock, net, fair value	$ 4,609	$ 5,893	$ 17,392	$ 20,960	$ 17,967	$ 2,223
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of loans held for investment	4,507		7,108
Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	2,514		2,710
Fair value of loans held for investment	4,507		7,108
Recurring | Level 3 | Interest rate lock commitments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate lock, net, fair value	$ 4,609		$ 17,392
Implied spread to benchmark interest rate curve | Minimum | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale, fair value inputs	0.0200		0.0200
Loans held for investment, fair vale inputs	0.0314		0.0396
Implied spread to benchmark interest rate curve | Maximum | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale, fair value inputs	0.0200		0.0200
Loans held for investment, fair vale inputs	0.0859		0.1064
Implied spread to benchmark interest rate curve | Weighted average | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale, fair value inputs	0.0200		0.0200
Loans held for investment, fair vale inputs	0.0473		0.0623
Fall-out factor | Minimum | Recurring | Level 3 | Interest rate lock commitments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate lock, net, fair value inputs	0.0087		0.0197
Fall-out factor | Maximum | Recurring | Level 3 | Interest rate lock commitments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate lock, net, fair value inputs	0.2405		0.3838
Fall-out factor | Weighted average | Recurring | Level 3 | Interest rate lock commitments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate lock, net, fair value inputs	0.1218		0.1553
Value of servicing | Minimum | Recurring | Level 3 | Interest rate lock commitments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate lock, net, fair value inputs	0.0039		0.0041
Value of servicing | Maximum | Recurring | Level 3 | Interest rate lock commitments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate lock, net, fair value inputs	0.0152		0.0144
Value of servicing | Weighted average | Recurring | Level 3 | Interest rate lock commitments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate lock, net, fair value inputs	0.0119		0.0097

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