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Loans Receivable - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Sep. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual loans by portfolio segment $ 1,257    
Impaired, interest lost on nonaccrual loans $ 687    
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.98% 1.47% 0.88%
Percent of TDRs classified as performing 96.60%    
Troubled debt restructuring, amount $ 1,694 $ 10,935  
Basis point reduction, minimum 1.00%    
Basis point reduction, maximum 2.00%    
Loans receivable, gross $ 10,110,184   $ 9,823,270
Single family residential loans as percentage of restructured loans 86.10%    
South Valley Bancorp, Inc.      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Fair value of loans acquired $ 1,700    
Covered loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Ratio of past due loans to total loans, net of charge-offs and LIPs 3.94%   6.80%
Loans receivable, gross $ 38,584   $ 75,909
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 12 months    
Performing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Troubled debt restructuring, amount $ 282,723