Credit Quality of Loans and Allowance for Loan Losses (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Specific Allowance	$ 1,293		$ 1,293		$ 1,422
Recorded Balance	11,789		11,789		12,900
Unpaid Principal Balance	12,384		12,384		13,496
Average Investment in Impaired Loans	11,927	11,324	12,291	11,276
Interest Income Recognized	135	52	376	248
One-to-four family residential
Loans without a specific valuation allowance, Recorded Balance	5,602		5,602		5,587
Loans without a specific valuation allowance, Unpaid Principal Balance	5,602		5,602		5,587
Loans without a specific valuation allowance, Average Investment in Impaired Loans	5,785	3,024	5,702	3,144
Loans without a specific valuation allowance, Interest Income Recognized	84	21	222	90
Loans with a specific valuation allowance, Recorded Balance	1,311		1,311		1,291
Loans with a specific valuation allowance, Unpaid Principal Balance	1,311		1,311		1,291
Specific Allowance	355		355		248
Loans with a specific valuation allowance, Average Investment in Impaired Loans	1,208	1,210	1,266	889
Loans with a specific valuation allowance, Interest Income Recognized	7	2	22	35
Recorded Balance	6,913		6,913		6,878
Unpaid Principal Balance	6,913		6,913		6,878
Average Investment in Impaired Loans	6,993	4,234	6,968	4,033
Interest Income Recognized	91	23	244	125
All other mortgage loans
Loans without a specific valuation allowance, Recorded Balance	2,225		2,225		2,781
Loans without a specific valuation allowance, Unpaid Principal Balance	2,225		2,225		2,781
Loans without a specific valuation allowance, Average Investment in Impaired Loans	2,276	2,324	2,427	2,179
Loans without a specific valuation allowance, Interest Income Recognized	23	3	72	58
Loans with a specific valuation allowance, Recorded Balance	2,502		2,502		3,056
Loans with a specific valuation allowance, Unpaid Principal Balance	3,097		3,097		3,652
Specific Allowance	869		869		1,074
Loans with a specific valuation allowance, Average Investment in Impaired Loans	2,504	4,723	2,730	4,998
Loans with a specific valuation allowance, Interest Income Recognized	20	25	56	64
Recorded Balance	4,727		4,727		5,837
Unpaid Principal Balance	5,322		5,322		6,433
Average Investment in Impaired Loans	4,780	7,047	5,157	7,177
Interest Income Recognized	43	28	128	122
Commercial business loans
Loans without a specific valuation allowance, Recorded Balance	80		80		85
Loans without a specific valuation allowance, Unpaid Principal Balance	80		80		85
Loans without a specific valuation allowance, Average Investment in Impaired Loans	81		83
Loans without a specific valuation allowance, Interest Income Recognized	1		2
Loans with a specific valuation allowance, Recorded Balance	69		69		100
Loans with a specific valuation allowance, Unpaid Principal Balance	69		69		100
Specific Allowance	69		69		100
Loans with a specific valuation allowance, Average Investment in Impaired Loans	73	43	83	66
Loans with a specific valuation allowance, Interest Income Recognized		1	2	1
Recorded Balance	149		149		185
Unpaid Principal Balance	149		149		185
Average Investment in Impaired Loans	154	43	166	66
Interest Income Recognized	$ 1	$ 1	$ 4	$ 1