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Allowance for Loan Losses - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Recoveries, net of charge-offs $ 113 $ 489  
Gross loans $ 17,763,942   $ 17,653,757
Percent past due 0.33%   0.36%
Financial Asset Originated      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-accrual loans $ 45,258   $ 50,422
Non-Performing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 55,388   $ 57,924
Ratio of non-performing assets to total assets 0.24%   0.26%
Commercial loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 10,563,949   $ 10,507,610
Percent past due 0.31%   0.31%
Commercial loans | Financial Asset Originated      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-accrual loans $ 28,852   $ 34,644
Commercial loans | Commercial & industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 2,364,982   $ 2,315,318
Percent past due 0.30%   0.36%
Commercial loans | Commercial & industrial | Financial Asset Originated      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-accrual loans $ 4,437   $ 6,082