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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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Loans Held-for-Investment, Measurement Input

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Value of input used to measure derivative asset.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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