LOANS HELD FOR INVESTMENT, NET - Performance of Modified Loans, After 12 Months (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Mar. 31, 2024
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans that defaulted during the quarter and were modified in the 12 months before default to borrowers experiencing financial difficulty	$ 90,596	$ 149,376
Current
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans that defaulted during the quarter and were modified in the 12 months before default to borrowers experiencing financial difficulty	46,651	100,451
30 to 59 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans that defaulted during the quarter and were modified in the 12 months before default to borrowers experiencing financial difficulty	27,603	12,651
60 to 89 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans that defaulted during the quarter and were modified in the 12 months before default to borrowers experiencing financial difficulty		21,790
Non-Accrual
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans that defaulted during the quarter and were modified in the 12 months before default to borrowers experiencing financial difficulty	16,342	14,484
Business Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans that defaulted during the quarter and were modified in the 12 months before default to borrowers experiencing financial difficulty	19,144	16,074
Business Loans | Current
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans that defaulted during the quarter and were modified in the 12 months before default to borrowers experiencing financial difficulty	18,899	13,694
Business Loans | 60 to 89 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans that defaulted during the quarter and were modified in the 12 months before default to borrowers experiencing financial difficulty		240
Business Loans | Non-Accrual
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans that defaulted during the quarter and were modified in the 12 months before default to borrowers experiencing financial difficulty	245	2,140
One-to-Four Family Residential and Cooperative/Condominium Apartment
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans that defaulted during the quarter and were modified in the 12 months before default to borrowers experiencing financial difficulty	892	3,353
One-to-Four Family Residential and Cooperative/Condominium Apartment | Current
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans that defaulted during the quarter and were modified in the 12 months before default to borrowers experiencing financial difficulty		3,262
One-to-Four Family Residential and Cooperative/Condominium Apartment | Non-Accrual
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans that defaulted during the quarter and were modified in the 12 months before default to borrowers experiencing financial difficulty	892	91
Multifamily Residential and Residential Mixed-Use
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans that defaulted during the quarter and were modified in the 12 months before default to borrowers experiencing financial difficulty	27,603	61,832
Multifamily Residential and Residential Mixed-Use | Current
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans that defaulted during the quarter and were modified in the 12 months before default to borrowers experiencing financial difficulty		27,631
Multifamily Residential and Residential Mixed-Use | 30 to 59 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans that defaulted during the quarter and were modified in the 12 months before default to borrowers experiencing financial difficulty	27,603	12,651
Multifamily Residential and Residential Mixed-Use | 60 to 89 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans that defaulted during the quarter and were modified in the 12 months before default to borrowers experiencing financial difficulty		21,550
Non-Owner-Occupied Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans that defaulted during the quarter and were modified in the 12 months before default to borrowers experiencing financial difficulty	42,957	55,864
Non-Owner-Occupied Commercial Real Estate | Current
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans that defaulted during the quarter and were modified in the 12 months before default to borrowers experiencing financial difficulty	27,752	55,864
Non-Owner-Occupied Commercial Real Estate | Non-Accrual
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans that defaulted during the quarter and were modified in the 12 months before default to borrowers experiencing financial difficulty	$ 15,205
Acquisition, development, and construction ("ADC")
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans that defaulted during the quarter and were modified in the 12 months before default to borrowers experiencing financial difficulty		12,253
Acquisition, development, and construction ("ADC") | Non-Accrual
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans that defaulted during the quarter and were modified in the 12 months before default to borrowers experiencing financial difficulty		$ 12,253