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Understanding our Financial Statements and the Impact to the Common Shareholder - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022
Related Party Transaction [Line Items] |  |  |  |
Interest and dividend income | $ 118 | $ 113 | $ 348 | $ 295
Trust services and administration revenues (related party of $8, $8, $23, and $23, respectively) | 158 | 8 | 173 | 23
Consolidating Eliminations |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Interest and dividend income | (11,275) | (12,716) | (36,303) | (37,920)
Trust services and administration revenues (related party of $8, $8, $23, and $23, respectively) | (5,739) | (7,208) | (18,788) | (22,257)
Provision for credit losses | (8,076) | (27,204) | (78,074) | (53,236)
Consolidating Eliminations | Ben Liquidity |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Interest and dividend income | 11,275 | 12,716 | 36,303 | 37,920
Trust services and administration revenues (related party of $8, $8, $23, and $23, respectively) | 0 | 0 | 0 | 0
Provision for credit losses | 8,076 | 27,204 | 78,074 | 53,236
Consolidating Eliminations | Ben Custody |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Interest and dividend income | 0 | 0 | 0 | 0
Trust services and administration revenues (related party of $8, $8, $23, and $23, respectively) | 5,739 | 7,208 | 18,788 | 22,257
Provision for credit losses | $ 0 | $ 0 | $ 0 | $ 0
Customer ExAlt Trusts |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
One time fee, percentage | 7.00% |  | 7.00% |
Recurring fee, percentage | 2.80% |  | 2.80% |
Minimum | Customer ExAlt Trusts |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Interest rate | 5.00% |  | 5.00% |
Maximum | Customer ExAlt Trusts |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Interest rate | 14.00% |  | 14.00% |

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