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Allowance for Losses on Loans - Additional Information (Details) - USD ($)
 3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Provision (release) for credit losses $ 500,000 $ 3,000,000    
Net (charge-offs) recoveries 2,111,000 1,734,000    
Allowance for credit losses on loans 171,411,000 170,189,000 $ 171,300,000 $ 166,955,000
Gross loans $ 14,763,613,000   $ 14,004,870,000  
% based on $, past due 0.31%   0.19%  
Financial Asset Originated        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-accrual loans $ 44,959,000   $ 31,749,000  
Non-Performing Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans $ 54,790,000   $ 43,625,000  
Ratio of non-performing assets to total assets 0.27%   0.22%  
Commercial loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for credit losses on loans $ 127,837,000 119,207,000 $ 125,375,000 109,923,000
Gross loans $ 8,748,073,000   $ 8,316,591,000  
% based on $, past due 0.27%   0.05%  
Commercial loans | Financial Asset Originated        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-accrual loans $ 25,865,000   $ 11,723,000  
Commercial loans | Commercial & industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for credit losses on loans 47,231,000 $ 44,317,000 45,957,000 $ 38,665,000
Gross loans $ 2,365,487,000   $ 2,303,927,000  
% based on $, past due 0.74%   0.01%  
Commercial loans | Commercial & industrial | Financial Asset Originated        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-accrual loans $ 15,349,000   $ 365,000  
Commercial loans | Commercial & industrial | SBA Payroll Protection Program, CARES Act        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for credit losses on loans 0   0  
Loans receivable, net of allowance for loan losses $ 198,947,000   $ 305,162,000