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Loans Receivable and Allowance for Loan Losses - Loans Individually Evaluated for Impairment (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
With no allowance recorded: Recorded investment $ 9,179 $ 11,647
With no allowance recorded: Unpaid principal balance 11,679 14,029
With a specific allowance recorded: Recorded investment 14,225 6,140
With a specific allowance recorded: Unpaid principal balance 14,275 6,296
Recorded Investment 23,404 17,787
Unpaid Principal Balance 25,954 20,325
Specific Allowance 1,342 915
Real estate loans | One-to-four family    
Financing Receivable, Impaired [Line Items]    
With no allowance recorded: Recorded investment 3,765 4,156
With no allowance recorded: Unpaid principal balance 4,911 5,307
With a specific allowance recorded: Recorded investment 4,801 4,892
With a specific allowance recorded: Unpaid principal balance 4,851 4,939
Recorded Investment 8,566 9,048
Unpaid Principal Balance 9,762 10,246
Specific Allowance 534 537
Real estate loans | Multifamily and commercial    
Financing Receivable, Impaired [Line Items]    
With no allowance recorded: Recorded investment 1,544 2,695
With no allowance recorded: Unpaid principal balance 2,331 3,482
With a specific allowance recorded: Recorded investment 1,127  
With a specific allowance recorded: Unpaid principal balance 1,127  
Recorded Investment 2,671 2,695
Unpaid Principal Balance 3,458 3,482
Specific Allowance 1 0
Real estate loans | Construction    
Financing Receivable, Impaired [Line Items]    
With a specific allowance recorded: Recorded investment 1,700  
With a specific allowance recorded: Unpaid principal balance 1,700  
Recorded Investment 1,700  
Unpaid Principal Balance 1,700  
Specific Allowance 381  
Commercial business loans    
Financing Receivable, Impaired [Line Items]    
With no allowance recorded: Recorded investment 2,648 2,285
With no allowance recorded: Unpaid principal balance 2,860 2,374
With a specific allowance recorded: Recorded investment 5,226 659
With a specific allowance recorded: Unpaid principal balance 5,226 768
Recorded Investment 7,874 2,944
Unpaid Principal Balance 8,086 3,142
Specific Allowance 410 366
Consumer loans | Home equity loans and advances    
Financing Receivable, Impaired [Line Items]    
With no allowance recorded: Recorded investment 1,222 2,511
With no allowance recorded: Unpaid principal balance 1,577 2,866
With a specific allowance recorded: Recorded investment 1,371 589
With a specific allowance recorded: Unpaid principal balance 1,371 589
Recorded Investment 2,593 3,100
Unpaid Principal Balance 2,948 3,455
Specific Allowance $ 16 $ 12