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Loans Receivable and Allowance for Loan Losses - Loans Receivable (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans $ 4,527,591   $ 4,353,121      
Net deferred loan costs 12,280   9,135      
Allowance for loan losses (59,952) $ (58,178) (54,633) $ (51,908) $ (51,849) $ (51,867)
Loans receivable, net 4,479,919   4,307,623      
Real estate loans | One-to-four family            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 1,689,375   1,578,835      
Allowance for loan losses (18,828) (19,991) (18,533) (18,818) (18,599) (18,638)
Real estate loans | Multifamily and commercial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 1,888,745   1,821,982      
Allowance for loan losses (19,097) (19,933) (18,029) (17,638) (17,616) (17,390)
Real estate loans | Construction            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 241,699   218,408      
Allowance for loan losses (6,574) (5,217) (5,299) (4,253) (4,598) (5,960)
Commercial business loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 273,325   267,664      
Allowance for loan losses (10,800) (8,275) (8,480) (7,014) (6,358) (4,052)
Consumer loans | Home equity loans and advances            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 433,108   464,962      
Allowance for loan losses (3,924) (4,576) (4,190) (4,129) (4,231) (5,721)
Consumer loans | Other consumer loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 1,339   1,270      
Allowance for loan losses $ (7) $ (8) $ (8) $ (10) $ (11) $ (11)