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Loans Receivable and Allowance for Loan Losses - Loans Individually Evaluated for Impairment (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
With no allowance recorded: Recorded investment $ 11,951 $ 14,611
With no allowance recorded: Unpaid principal balance 13,327 17,253
With a specific allowance recorded: Recorded investment 7,940 7,580
With a specific allowance recorded: Unpaid principal balance 8,744 8,167
Recorded investment 19,891 22,191
Unpaid principal balance 22,071 25,420
Specific allowance 884 546
Real estate loans | One-to-four family    
Financing Receivable, Impaired [Line Items]    
With no allowance recorded: Recorded investment 6,629 8,870
With no allowance recorded: Unpaid principal balance 7,417 9,704
With a specific allowance recorded: Recorded investment 3,787 2,774
With a specific allowance recorded: Unpaid principal balance 4,216 2,788
Recorded investment 10,416 11,644
Unpaid principal balance 11,633 12,492
Specific allowance 473 423
Real estate loans | Multifamily and commercial    
Financing Receivable, Impaired [Line Items]    
With no allowance recorded: Recorded investment 2,717 2,058
With no allowance recorded: Unpaid principal balance 2,727 2,933
With a specific allowance recorded: Recorded investment   1,635
With a specific allowance recorded: Unpaid principal balance   2,208
Recorded investment 2,717 3,693
Unpaid principal balance 2,727 5,141
Specific allowance 0 28
Commercial business loans    
Financing Receivable, Impaired [Line Items]    
With no allowance recorded: Recorded investment 0 1,522
With no allowance recorded: Unpaid principal balance 0 2,015
With a specific allowance recorded: Recorded investment 2,936 2,741
With a specific allowance recorded: Unpaid principal balance 2,895 2,741
Recorded investment 2,936 4,263
Unpaid principal balance 2,895 4,756
Specific allowance 377 80
Consumer loans | Home equity loans and advances    
Financing Receivable, Impaired [Line Items]    
With no allowance recorded: Recorded investment 2,605 2,161
With no allowance recorded: Unpaid principal balance 3,183 2,601
With a specific allowance recorded: Recorded investment 1,217 430
With a specific allowance recorded: Unpaid principal balance 1,633 430
Recorded investment 3,822 2,591
Unpaid principal balance 4,816 3,031
Specific allowance $ 34 $ 15