| LOANS ISSUED - Narrative (Details) - USD ($) $ in Thousands | 6 Months Ended | ||
|---|---|---|---|
| Sep. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | |
| Financing Receivable, Past Due [Line Items] | |||
| Debt, weighted average interest rate, period term | 20 years | ||
| Liability arising from continuing involvement | $ 458,608 | $ 440,805 | |
| Amount Outstanding | 829,050 | ||
| Interest receivable | $ 7,853 | $ 3,548 | |
| Percentage of agreements with significant increase in credit risk exceeding probability of default threshold | 20.00% | ||
| Bank customer loans loan | State mortgage program "7-20-25" | |||
| Financing Receivable, Past Due [Line Items] | |||
| Weighted average interest rate, over 20 year term | 7.00% | ||
| Weighted average interest rate, over 20 year term, transferred to program operator | 4.00% | ||
| Weighted average interest rate, over 20 year term, retained | 3.00% | ||
| Amount Outstanding | $ 469,612 | 463,114 | |
| Right of claims for purchased retail loans | |||
| Financing Receivable, Past Due [Line Items] | |||
| Amount Outstanding | $ 135,132 | $ 121,177 | 
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- Definition Debt, Weighted Average Interest Rate, Over 20 Year Term No definition available. 
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- Definition Debt, Weighted Average Interest Rate, Over 20 Year Term, Transferred to Program Operator No definition available. 
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- Definition Debt, Weighted Average Interest Rate, Over 20 Year Term, Transferred to Program Operator, Retained No definition available. 
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- Definition Debt, Weighted Average Interest Rate, Period Term No definition available. 
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- Definition Loans Issued No definition available. 
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- Definition Other Liabilities, Continuing Involvement No definition available. 
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- Definition Percentage Of Agreements With Significant Increase in Credit Risk Exceeding Probability Of Default Threshold No definition available. 
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
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- Definition Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
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