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OTHER BORROWINGS, Subordinated Notes (Details) - USD ($)
$ in Millions
9 Months Ended
Jun. 30, 2022
Jun. 01, 2022
Subordinated notes due 2030    
Debt Instrument [Line Items]    
Stated interest rate   5.75%
Redemption price percentage 100.00%  
Subordinated notes due 2030 | Debt Redemption, Beginning May 2025    
Debt Instrument [Line Items]    
Amount that may be redeemed $ 60  
Subordinated notes due 2030 | Debt Redemption, Beginning August 2025    
Debt Instrument [Line Items]    
Amount that may be redeemed $ 38  
TriState Capital    
Debt Instrument [Line Items]    
Long-term debt assumed   $ 11,700
TriState Capital | Subordinated notes due 2030    
Debt Instrument [Line Items]    
Long-term debt assumed   $ 98