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LOANS HELD FOR INVESTMENT, NET - Collateral Dependent Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 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 | $ 10,764,583 | $ 10,773,428 |  |
Allowance for credit losses | 76,068 | 71,743 |  |
Real Estate Collateral Dependent |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, net of fair value hedge basis point adjustments | 17,876 | 11,004 |  |
Allowance for credit losses | 1,497 | 926 |  |
Business loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for credit losses | 35,981 | 35,962 | $ 43,879 | $ 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 | 4,966 | 3,742 |  |
Allowance for credit losses | 1,210 |  |  |
One-to-four family residential and cooperative/condominium apartment |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for credit losses | 6,973 | 6,813 | 6,012 | 5,969
Multifamily residential and residential mixed-use |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for credit losses | 11,171 | 7,237 | 7,613 | 8,360
Non-owner-occupied commercial real estate |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for credit losses | 19,445 | 19,623 | 18,076 | 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 |  | 6,605 |  |
Allowance for credit losses |  | 621 |  |
Acquisition, development, and construction ("ADC") |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for credit losses | 2,322 | 1,989 | 2,515 | 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 | 12,910 | 657 |  |
Allowance for credit losses | 287 | 305 |  |
Other Loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for credit losses | $ 176 | $ 119 | $ 240 | $ 273

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