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FAIR VALUE MEASUREMENT - Schedule of Level 3 Unobservable Inputs (Details) $ in Thousands	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jun. 30, 2021 USD ($)	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	$ 322	$ 78	$ 2,484	$ 5,893	$ 6,488	$ 17,392
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Single family LHFI	6,508		7,287
Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	2,160		2,482
Single family LHFI	6,508		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	$ 322		$ 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	0.0280		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	0.0504		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	0.0340		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	0.0010		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	0.2056		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	0.0767		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	0.0052		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	0.0125		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	0.0096		0.0115

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