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LOANS HELD FOR INVESTMENT, NET - Collateral Dependent Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
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Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total loans, net of fair value hedge basis point adjustments | $ 10,892,044 |  | $ 10,773,428 |  |  |
Allowance for credit losses | 85,221 |  | 71,743 |  |  |
Real Estate Collateral Dependent |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total loans, net of fair value hedge basis point adjustments | 26,475 |  | 11,004 |  |  |
Allowance for credit losses | 1,395 |  | 926 |  |  |
Business Loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Allowance for credit losses | 45,026 | $ 37,115 | 35,962 | $ 36,680 | $ 39,700 | $ 47,029
Business Loans | Real Estate Collateral Dependent |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total loans, net of fair value hedge basis point adjustments | 6,324 |  | 3,742 |  |  |
Allowance for credit losses | 1,108 |  |  |  |  |
One-to-Four Family Residential and Cooperative/Condominium Apartment |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Allowance for credit losses | 8,646 | 7,305 | 6,813 | 7,206 | 6,419 | 5,969
Multifamily Residential and Residential Mixed-Use |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Allowance for credit losses | 12,503 | 12,357 | 7,237 | 7,567 | 8,190 | 8,360
Non-Owner-Occupied Commercial Real Estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Allowance for credit losses | 16,302 | 18,340 | 19,623 | 18,430 | 18,440 | 20,153
Non-Owner-Occupied Commercial Real Estate | Real Estate Collateral Dependent |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total loans, net of fair value hedge basis point adjustments | 19,494 |  | 6,605 |  |  |
Allowance for credit losses |  |  | 621 |  |  |
Acquisition, development, and construction ("ADC") |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Allowance for credit losses | 2,521 | 2,455 | 1,989 | 2,338 | 2,558 | 1,723
Acquisition, development, and construction ("ADC") | Real Estate Collateral Dependent |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total loans, net of fair value hedge basis point adjustments | 657 |  | 657 |  |  |
Allowance for credit losses | 287 |  | 305 |  |  |
Other Loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Allowance for credit losses | $ 223 | $ 240 | $ 119 | $ 342 | $ 339 | $ 273

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