Loans and Allowance for Loan Losses (Schedule of Impaired Loans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Specific Allowance	$ 658	$ 552
Recorded Balance	3,141	3,883
Unpaid Principal Balance	3,209	4,207
Average Investment in Impaired Loans	2,982	4,038
Interest Income Recognized	106	172
One-to-four family residential [Member]
Loans without a specific valuation allowance, Recorded Balance	1,121	1,224
Loans without a specific valuation allowance, Unpaid Principal Balance	1,189	1,238
Loans without a specific valuation allowance, Average Investment in Impaired Loans	1,019	1,493
Loans without a specific valuation allowance, Interest Income Recognized	37	44
Loans with a specific valuation allowance, Recorded Balance	406	1,565
Loans with a specific valuation allowance, Unpaid Principal Balance	406	1,875
Specific Allowance	323	506
Loans with a specific valuation allowance, Average Investment in Impaired Loans	622	1,347
Loans with a specific valuation allowance, Interest Income Recognized		56
Recorded Balance	1,527	2,789
Unpaid Principal Balance	1,595	3,113
Average Investment in Impaired Loans	1,641	2,840
Interest Income Recognized	37	100
All other mortgage loans [Member]
Loans without a specific valuation allowance, Recorded Balance	226
Loans without a specific valuation allowance, Unpaid Principal Balance	226
Loans without a specific valuation allowance, Average Investment in Impaired Loans	838	532
Loans without a specific valuation allowance, Interest Income Recognized	19
Loans with a specific valuation allowance, Recorded Balance	841	1,061
Loans with a specific valuation allowance, Unpaid Principal Balance	841	1,061
Specific Allowance	151	13
Loans with a specific valuation allowance, Average Investment in Impaired Loans	335	575
Loans with a specific valuation allowance, Interest Income Recognized	49	71
Recorded Balance	1,067	1,061
Unpaid Principal Balance	1,067	1,061
Average Investment in Impaired Loans	1,173	1,107
Interest Income Recognized	68	71
Commercial business loans [Member]
Loans without a specific valuation allowance, Recorded Balance
Loans without a specific valuation allowance, Unpaid Principal Balance
Loans without a specific valuation allowance, Average Investment in Impaired Loans		9
Loans without a specific valuation allowance, Interest Income Recognized
Loans with a specific valuation allowance, Recorded Balance	547	33
Loans with a specific valuation allowance, Unpaid Principal Balance	547	33
Specific Allowance	184	33
Loans with a specific valuation allowance, Average Investment in Impaired Loans	168	82
Loans with a specific valuation allowance, Interest Income Recognized	1	1
Recorded Balance	547	33
Unpaid Principal Balance	547	33
Average Investment in Impaired Loans	168	91
Interest Income Recognized	$ 1	$ 1