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Loans Receivable and Allowance for Loan Losses - Loans Receivable (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans $ 4,448,109 $ 4,353,121    
Net deferred loan costs 10,539 9,135    
Allowance for loan losses (58,178) (54,633) $ (51,849) $ (51,867)
Loans receivable, net 4,400,470 4,307,623    
Real estate loans | One to four family        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 1,616,259 1,578,835    
Allowance for loan losses (19,991) (18,533) (18,599) (18,638)
Real estate loans | Multifamily and commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 1,871,210 1,821,982    
Allowance for loan losses (19,933) (18,029) (17,616) (17,390)
Real estate loans | Construction        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 233,652 218,408    
Allowance for loan losses (5,217) (5,299) (4,598) (5,960)
Commercial business loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 277,970 267,664    
Allowance for loan losses (8,275) (8,480) (6,358) (5,721)
Consumer loans | Home equity loans and advances        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 448,020 464,962    
Allowance for loan losses (4,576) (4,190) (4,231) (4,052)
Consumer loans | Other consumer loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 998 1,270    
Allowance for loan losses $ (8) $ (8) $ (11) $ (11)