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Loans Receivable - Nonaccrual Loans (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Reserve For Uncollected Loan Interest $ 50 $ 103
Unpaid Principal Balance 3,164 4,097
Recorded Investment 1,636 2,390
Loans Past Due Over 90 Days, still accruing 0 0
Consumer Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Unpaid Principal Balance 6  
One-to-four family residential real estate loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Unpaid Principal Balance 2,800 3,413
Recorded Investment 1,491 1,918
Loans Past Due Over 90 Days, still accruing 0 0
One-to-four family residential real estate loans - non-owner occupied loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Unpaid Principal Balance 262 308
Recorded Investment 47 109
Loans Past Due Over 90 Days, still accruing 0 0
Multi-family mortgage loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Unpaid Principal Balance 96 376
Recorded Investment 92 363
Loans Past Due Over 90 Days, still accruing 0 $ 0
Consumer loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Recorded Investment 6  
Loans Past Due Over 90 Days, still accruing $ 0