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Loans Receivable and Allowance for Loan Losses - Loans Receivable (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans $ 4,891,402   $ 4,448,109      
Net deferred loan costs 15,301   10,539      
Allowance for loan losses (63,406) $ (62,524) (58,178) $ (54,633) $ (52,066) $ (51,849)
Loans receivable, net 4,843,297   4,400,470      
Real estate loans | One-to-four family            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 1,823,266   1,616,259      
Allowance for loan losses (17,525) (18,549) (19,991) (18,533) (18,762) (18,599)
Real estate loans | Multifamily and commercial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 2,089,130   1,871,210      
Allowance for loan losses (23,767) (22,802) (19,933) (18,029) (18,085) (17,616)
Real estate loans | Construction            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 269,729   233,652      
Allowance for loan losses (7,148) (6,728) (5,217) (5,299) (4,598) (4,598)
Commercial business loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 304,221   277,970      
Allowance for loan losses (11,865) (10,920) (8,275) (8,480) (6,563) (6,358)
Consumer loans | Home equity loans and advances            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 404,028   448,020      
Allowance for loan losses (2,843) (2,870) (4,577) (4,190) (3,965) (4,231)
Consumer loans | Other consumer loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans 1,028   998      
Allowance for loan losses $ (7) $ (7) $ (8) $ (8) $ (8) $ (11)