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Loans Receivable - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual interest income recognized $ 2,551    
Impaired, interest lost on nonaccrual loans $ 489    
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.43%   0.40%
Percent of TDRs classified as performing 97.60%    
Troubled debt restructuring, amount $ 9,268 $ 2,566  
Basis point reduction, minimum 1.00%    
Basis point reduction, maximum 2.00%    
Single family residential loans as percentage of restructured loans 85.70%    
Covered assets $ 58,699   $ 67,914
Loans receivable, gross 12,456,216   12,201,387
FDIC indemnification asset 0   8,967
FDIC clawback liability 39,906   37,143
FDIC loss share valuation adjustments (8,550) $ 0  
Covered loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross $ 54,865   $ 61,810
Minimum      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term for payment and rate reduction 6 months    
Maximum      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term for payment and rate reduction 24 months    
Performing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Troubled debt restructuring, amount $ 199,175