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Loans Receivable and Allowance for Loan Losses - Loans Individually Evaluated for Impairment (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
With no allowance recorded: Recorded investment $ 11,647 $ 14,611
With no allowance recorded: Unpaid principal balance 14,029 17,253
With a specific allowance recorded: Recorded investment 6,140 7,580
With a specific allowance recorded: Unpaid principal balance 6,296 8,167
Recorded investment 17,787 22,191
Unpaid principal balance 20,325 25,420
Specific allowance 915 546
Real estate loans | One-to-four family    
Financing Receivable, Impaired [Line Items]    
With no allowance recorded: Recorded investment 4,156 8,870
With no allowance recorded: Unpaid principal balance 5,307 9,704
With a specific allowance recorded: Recorded investment 4,892 2,774
With a specific allowance recorded: Unpaid principal balance 4,939 2,788
Recorded investment 9,048 11,644
Unpaid principal balance 10,246 12,492
Specific allowance 537 423
Real estate loans | Multifamily and commercial    
Financing Receivable, Impaired [Line Items]    
With no allowance recorded: Recorded investment 2,695 2,058
With no allowance recorded: Unpaid principal balance 3,482 2,933
With a specific allowance recorded: Recorded investment   1,635
With a specific allowance recorded: Unpaid principal balance   2,208
Recorded investment 2,695 3,693
Unpaid principal balance 3,482 5,141
Specific allowance 0 28
Commercial business loans    
Financing Receivable, Impaired [Line Items]    
With no allowance recorded: Recorded investment 2,285 1,522
With no allowance recorded: Unpaid principal balance 2,374 2,015
With a specific allowance recorded: Recorded investment 659 2,741
With a specific allowance recorded: Unpaid principal balance 768 2,741
Recorded investment 2,944 4,263
Unpaid principal balance 3,142 4,756
Specific allowance 366 80
Consumer loans | Home equity loans and advances    
Financing Receivable, Impaired [Line Items]    
With no allowance recorded: Recorded investment 2,511 2,161
With no allowance recorded: Unpaid principal balance 2,866 2,601
With a specific allowance recorded: Recorded investment 589 430
With a specific allowance recorded: Unpaid principal balance 589 430
Recorded investment 3,100 2,591
Unpaid principal balance 3,455 3,031
Specific allowance $ 12 $ 15