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Loans Receivable and Allowance for Loan Losses - Loans Individually Evaluated for Impairment (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
With no allowance recorded: Recorded investment $ 13,669 $ 14,611
With no allowance recorded: Unpaid principal balance 16,561 17,253
With a specific allowance recorded: Recorded investment 6,179 7,580
With a specific allowance recorded: Unpaid principal balance 6,018 8,167
Recorded investment 19,848 22,191
Unpaid principal balance 22,579 25,420
Specific allowance 842 546
Real estate loans | One-to-four family    
Financing Receivable, Impaired [Line Items]    
With no allowance recorded: Recorded investment 7,707 8,870
With no allowance recorded: Unpaid principal balance 8,890 9,704
With a specific allowance recorded: Recorded investment 2,898 2,774
With a specific allowance recorded: Unpaid principal balance 2,945 2,788
Recorded investment 10,605 11,644
Unpaid principal balance 11,835 12,492
Specific allowance 476 423
Real estate loans | Multifamily and commercial    
Financing Receivable, Impaired [Line Items]    
With no allowance recorded: Recorded investment 2,856 2,058
With no allowance recorded: Unpaid principal balance 4,204 2,933
With a specific allowance recorded: Recorded investment   1,635
With a specific allowance recorded: Unpaid principal balance   2,208
Recorded investment 2,856 3,693
Unpaid principal balance 4,204 5,141
Specific allowance 0 28
Commercial business loans    
Financing Receivable, Impaired [Line Items]    
With no allowance recorded: Recorded investment 16 1,522
With no allowance recorded: Unpaid principal balance 22 2,015
With a specific allowance recorded: Recorded investment 2,935 2,741
With a specific allowance recorded: Unpaid principal balance 2,727 2,741
Recorded investment 2,951 4,263
Unpaid principal balance 2,749 4,756
Specific allowance 355 80
Consumer loans | Home equity loans and advances    
Financing Receivable, Impaired [Line Items]    
With no allowance recorded: Recorded investment 3,090 2,161
With no allowance recorded: Unpaid principal balance 3,445 2,601
With a specific allowance recorded: Recorded investment 346 430
With a specific allowance recorded: Unpaid principal balance 346 430
Recorded investment 3,436 2,591
Unpaid principal balance 3,791 3,031
Specific allowance $ 11 $ 15