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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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