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LOANS HELD FOR INVESTMENT, NET - Impaired Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2020
Unpaid Principal Balance |  |  |
With no related allowance recorded |  |  | $ 4,567
With related allowance recorded |  |  | 12,502
Total |  |  | 17,069
Recorded Investment |  |  |
With no related allowance recorded |  |  | 4,567
With related allowance recorded |  |  | 12,502
Total |  |  | 17,069
Related Allowance |  |  |
Impaired Financing Receivable, Related Allowance |  |  | 6,474
Average Recorded Investment |  |  |
With no related allowance recorded | $ 5,832 | $ 7,408 |
With related allowance recorded | 15,961 |  |
Total |  | 7,524 |
Interest Income Recognized |  |  |
With no related allowance recorded |  | 100 |
Total |  | 100 |
Real estate |  |  |
Related Allowance |  |  |
Impaired Financing Receivable, Related Allowance |  |  | 0
Real estate | One- to-Four Family Residential, Including Condominium and Cooperative Apartment [Member] |  |  |
Average Recorded Investment |  |  |
With no related allowance recorded | 2,948 | 11 |
Real estate | Multifamily Residential and Residential Mixed-Use [Member] |  |  |
Unpaid Principal Balance |  |  |
With no related allowance recorded |  |  | 1,863
Recorded Investment |  |  |
With no related allowance recorded |  |  | 1,863
Related Allowance |  |  |
Impaired Financing Receivable, Related Allowance |  |  | 0
Average Recorded Investment |  |  |
With no related allowance recorded | 1,355 | 608 |
Interest Income Recognized |  |  |
With no related allowance recorded |  | 9 |
Real estate | Commercial Real Estate and Commercial Mixed-Use [Member] |  |  |
Unpaid Principal Balance |  |  |
With no related allowance recorded |  |  | 2,704
Recorded Investment |  |  |
With no related allowance recorded |  |  | 2,704
Related Allowance |  |  |
Impaired Financing Receivable, Related Allowance |  |  | 0
Average Recorded Investment |  |  |
With no related allowance recorded | 1,529 | 6,789 |
Interest Income Recognized |  |  |
With no related allowance recorded |  | 91 |
Commercial and industrial ("C&I") loans |  |  |
Unpaid Principal Balance |  |  |
With related allowance recorded |  |  | 12,502
Recorded Investment |  |  |
With related allowance recorded |  |  | 12,502
Related Allowance |  |  |
Impaired Financing Receivable, Related Allowance |  |  | $ 6,474
Average Recorded Investment |  |  |
With related allowance recorded | $ 10,129 | $ 116 |

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