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LOANS HELD FOR INVESTMENT, NET - Modified as TDRs (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) contract | Dec. 31, 2021 USD ($) loan | Dec. 31, 2020 USD ($) loan | Dec. 31, 2019 USD ($) loan
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Provision for credit losses | $ 6,212 |  |  | $ 26,165 | $ 17,340
Number of Loans |  | 1 | 4 |  |
Pre-Modification Outstanding Recorded Investment | 10,923 |  |  |  |
Post-Modification Outstanding Recorded Investment | 923 |  |  |  |
TDRs |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Modifications recorded investment | 942 | $ 942 | $ 942 | 0 |
Provision for credit losses | 483 |  |  |  |
Commitments to lend additional amounts | 0 |  |  | $ 0 | $ 0
Charge offs relating to TDRs | 0 |  |  |  |
Number of Loans | loan |  |  | 0 | 0 | 0
One-to-four family residential and cooperative/condominium apartment |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Number of Loans | loan |  |  | 2 |  |
Pre-Modification Outstanding Recorded Investment | 467 |  |  |  |
Post-Modification Outstanding Recorded Investment | 467 |  |  |  |
Commercial real estate ("CRE") |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Number of Loans | loan |  |  | 1 |  |
Pre-Modification Outstanding Recorded Investment | 10,000 |  |  |  |
Commercial and Industrial ("C&I") Loans |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Number of Loans | loan |  |  | 1 |  |
Pre-Modification Outstanding Recorded Investment | 456 |  |  |  |
Post-Modification Outstanding Recorded Investment | $ 456 |  |  |  |

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