Advances from the Federal Home Loan Bank (Details) (USD $)	3 Months Ended		12 Months Ended
	Dec. 31, 2012 item	Sep. 30, 2012 item	Dec. 31, 2012 item	Dec. 31, 2011
Advances from the Federal Home Loan Bank
Federal Home Loan Bank advances	$ 31,882,000		$ 31,882,000	$ 60,431,000
Separate advances			5
Number of separate advances with principal amount due at maturity			2
Amount of separate advances with principal amount due at maturity	30,000,000		30,000,000
Amount of separate advances with principal paid monthly	420,000		420,000
Amortization schedule			15 years
Number of final advances with principal paid monthly			2
Amount of final advances with principal paid monthly	1,462,000		1,462,000
Amortization schedule of final advances			30 years
Number of advances whose terms were restructured and extended	3	3
Amount of prepayment penalties incurred in association with the modification of FHLB advances	265,000	872,000
Amount of prepayment penalties and the remaining unamortized prepayment penalties	790,000
Advance
2013	10,000,000		10,000,000	20,000,000
2014				20,000,000
2015	20,000,000		20,000,000	20,000,000
2024	420,000		420,000	431,000
2028	1,462,000		1,462,000
Total	31,882,000		31,882,000	60,431,000
Rate (as a percent)
2013	1.90%		1.90%	1.55%
2014				2.43%
2015	3.34%		3.34%	3.34%
2024	2.40%		2.40%	2.40%
2028	1.46%		1.46%
Total	2.79%		2.79%	2.44%
Amount of available credit from the FHLB	$ 132,200,000		$ 132,200,000