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FAIR VALUE MEASUREMENT - Schedule of Level 3 Unobservable Inputs (Details) $ in Thousands | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
--- | --- | --- | --- | ---
Interest rate lock commitments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Interest rate lock, net, fair value | $ 78 | $ 2,484 | $ 6,488 | $ 17,392
Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Single family LHFI | 6,981 | 7,287 |  |
Recurring | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available for sale | 2,307 | 2,482 |  |
Single family LHFI | 6,981 | 7,287 |  |
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 | $ 78 | $ 2,484 |  |
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 | 0.0249 | 0.0239 |  |
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 | 0.0476 | 0.0796 |  |
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 | 0.0314 | 0.0356 |  |
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 | 0.0020 | 0.0015 |  |
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 | 0.2960 | 0.2193 |  |
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 | 0.1171 | 0.0844 |  |
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 | 0.0045 | 0.0035 |  |
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 | 0.0139 | 0.0146 |  |
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 | 0.0106 | 0.0115 |  |

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