Credit Quality of Loans and Allowance for Loan Losses (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Specific Allowance	$ 1,269	$ 1,422
Recorded Balance	12,410	12,900
Unpaid Principal Balance	13,185	13,496
Average Investment in Impaired Loans	12,655	11,295
Interest Income Recognized	131	111
One To Four Family Residential
Loans without a specific valuation allowance, Recorded Balance	5,653	5,587
Loans without a specific valuation allowance, Unpaid Principal Balance	5,653	5,587
Loans without a specific valuation allowance, Average Investment in Impaired Loans	5,620	3,232
Loans without a specific valuation allowance, Interest Income Recognized	78	39
Loans with a specific valuation allowance, Recorded Balance	1,356	1,291
Loans with a specific valuation allowance, Unpaid Principal Balance	1,356	1,291
Specific Allowance	232	248
Loans with a specific valuation allowance, Average Investment in Impaired Loans	1,324	821
Loans with a specific valuation allowance, Interest Income Recognized	13	25
Recorded Balance	7,009	6,878
Unpaid Principal Balance	7,009	6,878
Average Investment in Impaired Loans	6,944	4,053
Interest Income Recognized	91	64
All other mortgage loans
Loans without a specific valuation allowance, Recorded Balance	2,375	2,781
Loans without a specific valuation allowance, Unpaid Principal Balance	2,375	2,781
Loans without a specific valuation allowance, Average Investment in Impaired Loans	2,578	1,923
Loans without a specific valuation allowance, Interest Income Recognized	29	27
Loans with a specific valuation allowance, Recorded Balance	2,855	3,056
Loans with a specific valuation allowance, Unpaid Principal Balance	3,627	3,652
Specific Allowance	950	1,074
Loans with a specific valuation allowance, Average Investment in Impaired Loans	2,956	5,248
Loans with a specific valuation allowance, Interest Income Recognized	9	20
Recorded Balance	5,230	5,837
Unpaid Principal Balance	6,002	6,433
Average Investment in Impaired Loans	5,534	7,171
Interest Income Recognized	38	47
Commercial business loans
Loans without a specific valuation allowance, Recorded Balance	84	85
Loans without a specific valuation allowance, Unpaid Principal Balance	87	85
Loans without a specific valuation allowance, Average Investment in Impaired Loans	85
Loans without a specific valuation allowance, Interest Income Recognized	1
Loans with a specific valuation allowance, Recorded Balance	87	100
Loans with a specific valuation allowance, Unpaid Principal Balance	87	100
Specific Allowance	87	100
Loans with a specific valuation allowance, Average Investment in Impaired Loans	94	71
Loans with a specific valuation allowance, Interest Income Recognized	1
Recorded Balance	171	185
Unpaid Principal Balance	174	185
Average Investment in Impaired Loans	178	71
Interest Income Recognized	$ 2