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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%