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FAIR VALUE MEASUREMENT - Schedule of Level 3 Unobservable Inputs (Details) $ in Thousands | Sep. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($)
--- | --- | --- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Investment securities AFS | $ 1,117,551 |  | $ 1,251,199 |  |  |
Interest rate lock commitments |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Interest rate lock commitments, net | 596 | $ 483 | 411 | $ (75) | $ 79 | $ 105
Recurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Single family LHFI | 1,329 |  | 1,280 |  |  |
Recurring | Level 3 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Single family LHFI | 1,329 |  | 1,280 |  |  |
Recurring | Level 3 | Investment securities AFS |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Investment securities AFS | 1,804 |  | 1,860 |  |  |
Recurring | Level 3 | Single family LHFI |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Single family LHFI | 1,329 |  | 1,280 |  |  |
Recurring | Level 3 | Interest rate lock commitments |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Interest rate lock commitments, net | $ 596 |  | $ 411 |  |  |
Implied spread to benchmark interest rate curve | Low | Recurring | Level 3 | Investment securities AFS |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Implied spread to benchmark interest rate curve | 0.0225 |  | 0.0225 |  |  |
Implied spread to benchmark interest rate curve | Low | Recurring | Level 3 | Single family LHFI |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Implied spread to benchmark interest rate curve | 0.0285 |  | 0.0330 |  |  |
Implied spread to benchmark interest rate curve | High | Recurring | Level 3 | Investment securities AFS |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Implied spread to benchmark interest rate curve | 0.0225 |  | 0.0225 |  |  |
Implied spread to benchmark interest rate curve | High | Recurring | Level 3 | Single family LHFI |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Implied spread to benchmark interest rate curve | 0.0559 |  | 0.0504 |  |  |
Implied spread to benchmark interest rate curve | Weighted Average | Recurring | Level 3 | Investment securities AFS |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Implied spread to benchmark interest rate curve | 0.0225 |  | 0.0225 |  |  |
Implied spread to benchmark interest rate curve | Weighted Average | Recurring | Level 3 | Single family LHFI |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Implied spread to benchmark interest rate curve | 0.0364 |  | 0.0394 |  |  |
Fall-out factor | Low | Recurring | Level 3 | Interest rate lock commitments |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Fall-out factor, Value of servicing | 0.0060 |  | 0.0081 |  |  |
Fall-out factor | High | Recurring | Level 3 | Interest rate lock commitments |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Fall-out factor, Value of servicing | 0.4179 |  | 0.4164 |  |  |
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] |  |  |  |  |  |
Fall-out factor, Value of servicing | 0.1032 |  | 0.1054 |  |  |
Value of servicing | Low | Recurring | Level 3 | Interest rate lock commitments |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Fall-out factor, Value of servicing | 0.0065 |  | 0.0032 |  |  |
Value of servicing | High | Recurring | Level 3 | Interest rate lock commitments |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Fall-out factor, Value of servicing | 0.0189 |  | 0.0080 |  |  |
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] |  |  |  |  |  |
Fall-out factor, Value of servicing | 0.0116 |  | 0.0057 |  |  |

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