Federal Home Loan Bank Advances (Details) (USD $)	9 Months Ended
	Sep. 30, 2013 item	Dec. 31, 2012
Federal Home Loan Bank Advances
Federal Home Loan Bank advances	$ 32,422,000	$ 31,882,000
Separate advances	6
Number of separate advances with principal amount due at maturity	2
Amount of separate advances with principal amount due at maturity	30,000,000
Number of final advances with principal paid monthly	4
Amount of final advances with principal paid monthly	2,422,000
Advance
2013	10,000,000	10,000,000
2015	20,000,000	20,000,000
2021	575,000
2024	411,000	420,000
2028	1,436,000	1,462,000
Total	32,422,000	31,882,000
Rate (as a percent)
2013	1.90%	1.90%
2015	3.34%	3.34%
2021	2.12%
2024	2.40%	2.40%
2028	1.46%	1.46%
Total	2.78%	2.79%
Amount of available credit from the FHLB	$ 342,900,000