Loans and Servicing (Details) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
Loans
Total loans	$ 207,502,000	$ 181,809,000
Other items:
Net deferred loan costs	494,000	570,000
Allowance for loan losses	(2,096,000)	(1,780,000)	(1,751,000)	(1,824,000)
Total loans, net	205,900,000	180,599,000
Total loans (as a percent)	100.00%	100.00%
Residential loans:
Loans
Total loans	108,976,000	111,106,000
Other items:
Total loans (as a percent)	52.51%	61.10%
One- to four- family, residential loans
Loans
Total loans	93,736,000	95,546,000
Other items:
Allowance for loan losses	(287,000)	(378,000)	(360,000)	(346,000)
Total loans (as a percent)	45.17%	52.54%
Home equity loans and lines of credit
Loans
Total loans	15,240,000	15,560,000
Other items:
Allowance for loan losses	(236,000)	(254,000)	(259,000)	(341,000)
Total loans (as a percent)	7.34%	8.56%
Commercial loans:
Loans
Total loans	78,143,000	58,084,000
Other items:
Total loans (as a percent)	37.66%	31.95%
One-to-four family investment property
Loans
Total loans	13,017,000	11,355,000
Other items:
Allowance for loan losses	(72,000)	(62,000)	(51,000)	(59,000)
Total loans (as a percent)	6.27%	6.25%
Multi-family real estate
Loans
Total loans	5,731,000	5,346,000
Other items:
Allowance for loan losses	(43,000)	(40,000)	(71,000)	(98,000)
Total loans (as a percent)	2.76%	2.94%
Commercial real estate
Loans
Total loans	47,987,000	32,730,000
Other items:
Allowance for loan losses	(884,000)	(668,000)	(648,000)	(400,000)
Total loans (as a percent)	23.13%	18.00%
Commercial business
Loans
Total loans	11,408,000	8,653,000
Other items:
Allowance for loan losses	(208,000)	(159,000)	(124,000)	(234,000)
Total loans (as a percent)	5.50%	4.76%
Construction loans:
Loans
Total loans	19,964,000	12,205,000
Other items:
Total loans (as a percent)	9.63%	6.72%
One-to-four family, construction loans
Loans
Total loans	7,897,000	7,379,000
Other items:
Allowance for loan losses	(187,000)	(149,000)	(150,000)	(228,000)
Total loans (as a percent)	3.81%	4.06%
Multi-family
Loans
Total loans	6,947,000	3,665,000
Other items:
Allowance for loan losses	(64,000)	(34,000)	(66,000)	(98,000)
Total loans (as a percent)	3.35%	2.02%
Non-residential
Loans
Total loans	5,120,000	1,161,000
Other items:
Allowance for loan losses	(103,000)	(25,000)	(12,000)	(11,000)
Total loans (as a percent)	2.47%	0.64%
Consumer
Loans
Total loans	419,000	414,000
Other items:
Allowance for loan losses	$ (12,000)	$ (11,000)	$ (10,000)	$ (9,000)
Total loans (as a percent)	0.20%	0.23%