Credit Quality of Loans and Allowance for Loan Losses (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Specific Allowance	$ 1,337		$ 1,337		$ 1,422
Recorded Balance	12,061		12,061		12,900
Unpaid Principal Balance	12,657		12,657		13,496
Average Investment in Impaired Loans	12,236	11,461	12,457	10,841
Interest Income Recognized	110	85	241	196
One-to-four family residential
Loans without a specific valuation allowance, Recorded Balance	5,967		5,967		5,587
Loans without a specific valuation allowance, Unpaid Principal Balance	5,967		5,967		5,587
Loans without a specific valuation allowance, Average Investment in Impaired Loans	5,810	3,148	5,736	3,118
Loans without a specific valuation allowance, Interest Income Recognized	60	30	138	69
Loans with a specific valuation allowance, Recorded Balance	1,104		1,104		1,291
Loans with a specific valuation allowance, Unpaid Principal Balance	1,104		1,104		1,291
Specific Allowance	339		339		248
Loans with a specific valuation allowance, Average Investment in Impaired Loans	1,230	1,224	1,250	828
Loans with a specific valuation allowance, Interest Income Recognized	2	8	15	33
Recorded Balance	7,071		7,071		6,878
Unpaid Principal Balance	7,071		7,071		6,878
Average Investment in Impaired Loans	7,040	4,372	6,986	3,946
Interest Income Recognized	62	38	153	102
All other mortgage loans
Loans without a specific valuation allowance, Recorded Balance	2,326		2,326		2,781
Loans without a specific valuation allowance, Unpaid Principal Balance	2,326		2,326		2,781
Loans without a specific valuation allowance, Average Investment in Impaired Loans	2,351	2,067	2,494	1,916
Loans without a specific valuation allowance, Interest Income Recognized	20	28	49	55
Loans with a specific valuation allowance, Recorded Balance	2,506		2,506		3,056
Loans with a specific valuation allowance, Unpaid Principal Balance	3,102		3,102		3,652
Specific Allowance	922		922		1,074
Loans with a specific valuation allowance, Average Investment in Impaired Loans	2,681	4,973	2,806	4,909
Loans with a specific valuation allowance, Interest Income Recognized	27	19	36	39
Recorded Balance	4,832		4,832		5,837
Unpaid Principal Balance	5,428		5,428		6,433
Average Investment in Impaired Loans	5,031	7,040	5,300	6,825
Interest Income Recognized	47	7	85	94
Commercial business loans
Loans without a specific valuation allowance, Recorded Balance	82		82		85
Loans without a specific valuation allowance, Unpaid Principal Balance	82		82		85
Loans without a specific valuation allowance, Average Investment in Impaired Loans	83		84
Loans without a specific valuation allowance, Interest Income Recognized			1
Loans with a specific valuation allowance, Recorded Balance	76		76		100
Loans with a specific valuation allowance, Unpaid Principal Balance	76		76		100
Specific Allowance	76		76		100
Loans with a specific valuation allowance, Average Investment in Impaired Loans	82	49	88	70
Loans with a specific valuation allowance, Interest Income Recognized	1		2
Recorded Balance	158		158		185
Unpaid Principal Balance	158		158		185
Average Investment in Impaired Loans	165	49	171	70
Interest Income Recognized	$ 1		$ 3