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Loans Receivable and Allowance for Loan Losses - Loans Individually Evaluated for Impairment (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
With no allowance recorded: Recorded investment $ 9,786 $ 11,647
With no allowance recorded: Unpaid principal balance 11,957 14,029
With a specific allowance recorded: Recorded investment 11,774 6,140
With a specific allowance recorded: Unpaid principal balance 11,824 6,296
Recorded Investment 21,560 17,787
Unpaid Principal Balance 23,781 20,325
Specific Allowance 1,130 915
Real estate loans | One-to-four family    
Financing Receivable, Impaired [Line Items]    
With no allowance recorded: Recorded investment 4,420 4,156
With no allowance recorded: Unpaid principal balance 5,565 5,307
With a specific allowance recorded: Recorded investment 4,711 4,892
With a specific allowance recorded: Unpaid principal balance 4,761 4,939
Recorded Investment 9,131 9,048
Unpaid Principal Balance 10,326 10,246
Specific Allowance 507 537
Real estate loans | Multifamily and commercial    
Financing Receivable, Impaired [Line Items]    
With no allowance recorded: Recorded investment 1,511 2,695
With no allowance recorded: Unpaid principal balance 2,212 3,482
With a specific allowance recorded: Recorded investment 1,113  
With a specific allowance recorded: Unpaid principal balance 1,113  
Recorded Investment 2,624 2,695
Unpaid Principal Balance 3,325 3,482
Specific Allowance 2 0
Commercial business loans    
Financing Receivable, Impaired [Line Items]    
With no allowance recorded: Recorded investment 2,223 2,285
With no allowance recorded: Unpaid principal balance 2,411 2,374
With a specific allowance recorded: Recorded investment 4,876 659
With a specific allowance recorded: Unpaid principal balance 4,876 768
Recorded Investment 7,099 2,944
Unpaid Principal Balance 7,287 3,142
Specific Allowance 607 366
Consumer loans | Home equity loans and advances    
Financing Receivable, Impaired [Line Items]    
With no allowance recorded: Recorded investment 1,632 2,511
With no allowance recorded: Unpaid principal balance 1,769 2,866
With a specific allowance recorded: Recorded investment 1,074 589
With a specific allowance recorded: Unpaid principal balance 1,074 589
Recorded Investment 2,706 3,100
Unpaid Principal Balance 2,843 3,455
Specific Allowance $ 14 $ 12