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Allowance for Losses on Loans - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Release of loan loss allowance $ (1,000) $ (500)    
Charge-offs, net of (recoveries) (2,579) (1,408)    
Loans receivable, gross $ 13,404,413   $ 13,312,388  
% based on $ 0.30%   0.29%  
Allowance for loan losses $ 132,513 $ 131,165 $ 131,534 $ 129,257
Non-accrual loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-accrual loans 30,089   33,731  
Loans Collectively Evaluated for Impairment        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, gross 12,059,764   12,076,622  
Allowance for loan losses 132,253   131,095  
Loans Individually Evaluated for Impairment        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, gross 32,367   34,425  
Allowance for loan losses 260   439  
Non-Performing Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, gross $ 39,742   $ 43,826  
Ratio of non-performing assets to total assets 0.24%   0.27%  
Non-accrual loans $ 30,089   $ 33,731