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LOANS HELD FOR INVESTMENT, NET - Loan Categories (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
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Loans held for investment, net: |  |  |  |  |  |
Total Loans | $ 10,850,611 |  | $ 10,566,831 |  |  |
Allowance for loan losses | (72,563) |  | (83,507) |  |  |
Total loans held for investment, net | 10,778,048 |  | 10,483,324 |  |  |
Business loans |  |  |  |  |  |
Loans held for investment, net: |  |  |  |  |  |
Total Loans | 2,271,768 |  | 2,211,857 |  |  |
Allowance for loan losses | (36,680) | $ (39,700) | (47,029) | $ (44,492) | $ (45,128) | $ (62,366)
One-to-four family residential and cooperative/condominium apartment |  |  |  |  |  |
Loans held for investment, net: |  |  |  |  |  |
Total Loans | 892,869 |  | 773,321 |  |  |
Allowance for loan losses | (7,206) | (6,419) | (5,969) | (5,058) | (4,514) | (5,932)
Multifamily residential and residential mixed-use |  |  |  |  |  |
Loans held for investment, net: |  |  |  |  |  |
Total Loans | 4,102,024 |  | 4,026,826 |  |  |
Allowance for loan losses | (7,567) | (8,190) | (8,360) | (8,054) | (7,003) | (7,816)
Non-owner-occupied commercial real estate |  |  |  |  |  |
Loans held for investment, net: |  |  |  |  |  |
Total Loans | 3,374,281 |  | 3,317,485 |  |  |
Allowance for loan losses | (18,430) | (18,440) | (20,153) | (20,507) | (18,707) | (2,131)
Non-owner-occupied commercial real estate | Total real estate loans |  |  |  |  |  |
Loans held for investment, net: |  |  |  |  |  |
Total Loans | 3,374,281 |  | 3,317,485 |  |  |
Acquisition, development, and construction ("ADC") |  |  |  |  |  |
Loans held for investment, net: |  |  |  |  |  |
Total Loans | 203,402 |  | 229,663 |  |  |
Allowance for loan losses | (2,338) | (2,558) |  | (3,619) | (3,788) |
Acquisition, development, and construction ("ADC") | Total real estate loans |  |  |  |  |  |
Loans held for investment, net: |  |  |  |  |  |
Allowance for loan losses | (2,338) |  | (1,723) | (3,619) |  | (4,857)
Other Loans |  |  |  |  |  |
Loans held for investment, net: |  |  |  |  |  |
Total Loans | 6,267 |  | 7,679 |  |  |
Allowance for loan losses | $ (342) | $ (339) | $ (273) | $ (205) | $ (286) | $ (751)

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