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LOANS HELD FOR INVESTMENT, NET - Loan Categories (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
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Loans held for investment, net: |  |  |  |  |  |
Total Loans | $ 10,116,941 |  | $ 9,244,661 |  |  |
Allowance for loan losses | (81,935) | $ (79,426) | (83,853) | $ (81,255) | $ (92,760) | $ (41,461)
Total loans held for investment, net | $ 10,035,006 |  | 9,160,808 |  |  |
Small Business Administration ("SBA") Paycheck Protection Program ("PPP") [Member] |  |  |  |  |  |
Loans held for investment, net: |  |  |  |  |  |
Loan and leases carry guarantee rate | 100.00% |  |  |  |  |
Total real estate loans |  |  |  |  |  |
Loans held for investment, net: |  |  |  |  |  |
Total Loans | $ 9,195,863 |  | 8,294,204 |  |  |
Allowance for loan losses | (45,282) | (41,552) | (47,771) | (49,033) | (62,166) | (28,712)
One-to-four family residential and cooperative/condominium apartment |  |  |  |  |  |
Loans held for investment, net: |  |  |  |  |  |
Total Loans | 722,081 |  | 669,282 |  |  |
Allowance for loan losses | (5,058) | (4,514) | (5,932) | (6,104) | (5,522) | (644)
Multifamily residential and residential mixed-use |  |  |  |  |  |
Loans held for investment, net: |  |  |  |  |  |
Total Loans | 3,968,244 |  | 3,356,346 |  |  |
Allowance for loan losses | (8,054) | (7,003) | (7,816) | (8,307) | (10,285) | (17,016)
Commercial real estate ("CRE") |  |  |  |  |  |
Loans held for investment, net: |  |  |  |  |  |
Total Loans | 4,264,519 |  | 3,945,948 |  |  |
Allowance for loan losses | (28,551) | (26,247) | (29,166) | (29,603) | (41,201) | (9,059)
Acquisition, development, and construction |  |  |  |  |  |
Loans held for investment, net: |  |  |  |  |  |
Total Loans | 241,019 |  | 322,628 |  |  |
Allowance for loan losses | (3,619) | (3,788) | (4,857) | (5,019) | (5,158) | (1,993)
Commercial and Industrial ("C&I") Loans |  |  |  |  |  |
Loans held for investment, net: |  |  |  |  |  |
Total Loans | 912,151 |  | 933,559 |  |  |
Allowance for loan losses | (36,448) | (37,588) | (35,331) | (31,545) | (30,095) | (12,737)
Commercial and Industrial ("C&I") Loans | Small Business Administration ("SBA") Paycheck Protection Program ("PPP") [Member] |  |  |  |  |  |
Loans held for investment, net: |  |  |  |  |  |
Total Loans | 11,400 |  | 66,000 |  |  |
Other Loans |  |  |  |  |  |
Loans held for investment, net: |  |  |  |  |  |
Total Loans | 8,927 |  | 16,898 |  |  |
Allowance for loan losses | $ (205) | $ (286) | $ (751) | $ (677) | $ (499) | $ (12)

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