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LOANS HELD FOR INVESTMENT, NET - Impaired Real Estate Loans (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2020
Unpaid Principal Balance [Abstract] |  |
With no related allowance recorded |  | $ 4,567
With related allowance recorded |  | 12,502
Total |  | 17,069
Recorded Investment [Abstract] |  |
With no related allowance recorded |  | 4,567
With related allowance recorded |  | 12,502
Total |  | 17,069
Related Allowance [Abstract] |  |
Related allowance |  | 6,474
Average Recorded Investment [Abstract] |  |
With no related allowance recorded | $ 3,749 |
Total | 13,831 |
Interest Income Recognized [Abstract] |  |
With no related allowance recorded | 7 |
Total | 7 |
Real estate |  |
Related Allowance [Abstract] |  |
Related allowance |  | 0
Real estate | One-to-four family residential and cooperative/condominium apartment |  |
Average Recorded Investment [Abstract] |  |
With no related allowance recorded | 2,948 |
Real estate | Multifamily residential and residential mixed-use |  |
Unpaid Principal Balance [Abstract] |  |
With no related allowance recorded |  | 1,863
Recorded Investment [Abstract] |  |
With no related allowance recorded |  | 1,863
Related Allowance [Abstract] |  |
Related allowance |  | 0
Average Recorded Investment [Abstract] |  |
With no related allowance recorded | 743 |
Interest Income Recognized [Abstract] |  |
With no related allowance recorded | 6 |
Real estate | Commercial real estate ("CRE") |  |
Unpaid Principal Balance [Abstract] |  |
With no related allowance recorded |  | 2,704
Recorded Investment [Abstract] |  |
With no related allowance recorded |  | 2,704
Related Allowance [Abstract] |  |
Related allowance |  | 0
Average Recorded Investment [Abstract] |  |
With no related allowance recorded | 58 |
Interest Income Recognized [Abstract] |  |
With no related allowance recorded | 1 |
Commercial and industrial ("C&I") |  |
Unpaid Principal Balance [Abstract] |  |
With related allowance recorded |  | 12,502
Recorded Investment [Abstract] |  |
With related allowance recorded |  | 12,502
Related Allowance [Abstract] |  |
Related allowance |  | $ 6,474
Average Recorded Investment [Abstract] |  |
With related allowance recorded | $ 10,082 |

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