v3.26.3
Summary of Significant Accounting Policies - Reconciliation of Gross to Net Balances Expressed (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Gross Amounts of Recognized Assets/(Liabilities) $ (414) $ 167
Net Amount of Asset/(Liabilities) Presented on the Consolidated Statement of Financial Condition (414) 167
Net Amount (414) 167
Bank of Nova Scotia    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Gross Amounts of Recognized Assets/(Liabilities) 1,467 385
Gross Amounts offset in the Consolidated Statement of Financial Condition (1,467) (218)
Net Amount of Asset/(Liabilities) Presented on the Consolidated Statement of Financial Condition   167
Net Amount   167
Bank of Nova Scotia Twenty One    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Gross Amounts of Recognized Assets/(Liabilities) (1,881) (218)
Gross Amounts offset in the Consolidated Statement of Financial Condition 1,467 $ 218
Net Amount of Asset/(Liabilities) Presented on the Consolidated Statement of Financial Condition (414)  
Net Amount $ (414)