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LOANS HELD FOR INVESTMENT, NET - Collateral Dependent Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, net of fair value hedge basis point adjustments | $ 10,773,428 | $ 10,566,831 |  |
Allowance for credit losses | 71,743 | 83,507 |  |
Total real estate loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, net of fair value hedge basis point adjustments | 9,694,144 | 9,487,440 |  |
Allowance for credit losses | 42,647 | 43,381 | $ 47,771 | $ 28,712
Real Estate Collateral Dependent | Total real estate loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, net of fair value hedge basis point adjustments | 11,004 | 8,997 |  |
Allowance for credit losses | 926 | 1,297 |  |
One-to-four family residential and cooperative/condominium apartment |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, net of fair value hedge basis point adjustments | 887,555 | 773,321 |  |
Allowance for credit losses | 6,813 | 5,969 | 5,932 | 644
Multifamily residential and residential mixed-use |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, net of fair value hedge basis point adjustments | 4,017,176 | 4,026,826 |  |
Allowance for credit losses | 7,237 | 8,360 | 7,816 | 17,016
Commercial real estate ("CRE") |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, net of fair value hedge basis point adjustments | 4,620,900 | 4,457,630 |  |
Allowance for credit losses | 26,608 | 27,329 | 29,166 | 9,059
Commercial real estate ("CRE") | Real Estate Collateral Dependent |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, net of fair value hedge basis point adjustments | 8,903 | 7,391 |  |
Allowance for credit losses | 621 | 1,297 |  |
Acquisition, development, and construction ("ADC") |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, net of fair value hedge basis point adjustments | 168,513 | 229,663 |  |
Allowance for credit losses | 1,989 | 1,723 | 4,857 | 1,993
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 | 305 |  |  |
Commercial and Industrial ("C&I") Loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, net of fair value hedge basis point adjustments | 1,066,938 | 1,071,712 |  |
Allowance for credit losses | 28,977 | 39,853 | 35,331 | 12,737
Commercial and Industrial ("C&I") Loans | Real Estate Collateral Dependent |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, net of fair value hedge basis point adjustments | 1,444 | 949 |  |
Other Loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, net of fair value hedge basis point adjustments | 5,755 | 7,679 |  |
Allowance for credit losses | $ 119 | $ 273 | $ 751 | $ 12

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