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LOANS HELD FOR INVESTMENT, NET - Collateral Dependent Loans (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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Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total Loans | $ 10,850,611 |  | $ 10,566,831 |  |  |
Allowance for credit losses | 72,563 |  | 83,507 |  |  |
Real Estate Collateral Dependent | Total real estate loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total Loans | 4,428 |  | 8,997 |  |  |
Allowance for credit losses | 305 |  | 1,297 |  |  |
Business loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total Loans | 2,271,768 |  | 2,211,857 |  |  |
Allowance for credit losses | 36,680 | $ 39,700 | 47,029 | $ 44,492 | $ 45,128 | $ 62,366
Business loans | Real Estate Collateral Dependent |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total Loans | 3,771 |  | 5,849 |  |  |
One-to-four family residential and cooperative/condominium apartment |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total Loans | 892,869 |  | 773,321 |  |  |
Allowance for credit losses | 7,206 | 6,419 | 5,969 | 5,058 | 4,514 | 5,932
Multifamily residential and residential mixed-use |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total Loans | 4,102,024 |  | 4,026,826 |  |  |
Allowance for credit losses | 7,567 | 8,190 | 8,360 | 8,054 | 7,003 | 7,816
Non-owner-occupied commercial real estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total Loans | 3,374,281 |  | 3,317,485 |  |  |
Allowance for credit losses | 18,430 | 18,440 | 20,153 | 20,507 | 18,707 | 2,131
Non-owner-occupied commercial real estate | Total real estate loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total Loans | 3,374,281 |  | 3,317,485 |  |  |
Non-owner-occupied commercial real estate | Real Estate Collateral Dependent |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total Loans |  |  | 2,491 |  |  |
Allowance for credit losses |  |  | 1,297 |  |  |
Acquisition, development, and construction ("ADC") |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total Loans | 203,402 |  | 229,663 |  |  |
Allowance for credit losses | 2,338 | 2,558 |  | 3,619 | 3,788 |
Acquisition, development, and construction ("ADC") | Total real estate loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Allowance for credit losses | 2,338 |  | 1,723 | 3,619 |  | 4,857
Acquisition, development, and construction ("ADC") | Real Estate Collateral Dependent |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total Loans | 657 |  | 657 |  |  |
Allowance for credit losses | 305 |  |  |  |  |
Other Loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total Loans | 6,267 |  | 7,679 |  |  |
Allowance for credit losses | $ 342 | $ 339 | $ 273 | $ 205 | $ 286 | $ 751

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