Borrowings (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Pledged financial instruments for Federal Home Loan Bank	$ 179,000,000	$ 142,000,000
Short-term Debt [Line Items]
Amount	11,609,000	13,756,000
Rate (in hundredths)	0.10%	0.23%
Line of Credit [Member]
Short-term Debt [Line Items]
Amount	0	2,661,000
Rate (in hundredths)	0.00%	0.75%
Repurchase Agreements [Member]
Short-term Debt [Line Items]
Amount	11,609,000	11,095,000
Rate (in hundredths)	0.10%	0.10%
Fixed Rate Advances with Monthly Principal and Interest Payments [Member]
Debt Instrument [Line Items]
Long-term debt	13,128,000	13,705,000
Federal Home Loan Bank Fixed Rate Advance Due January 2015 [Member] | Fixed Rate Advances Due at Maturity [Member]
Debt Instrument [Line Items]
Long-term debt	5,000,000	5,000,000
Interest rate, period end (in hundredths)	2.00%
Federal Home Loan Bank Advance Due March 2017 [Member] | Fixed Rate Advances Due at Maturity [Member]
Debt Instrument [Line Items]
Long-term debt	5,000,000	5,000,000
Interest rate, period end (in hundredths)	5.25%
Federal Home Loan Bank Advance Due March 2014 [Member] | Fixed Rate Advances with Monthly Principal and Interest Payments [Member]
Debt Instrument [Line Items]
Long-term debt	1,050,000	1,308,000
Interest rate, period end (in hundredths)	2.45%
Federal Home Loan Bank Advance Due March 2019 [Member] | Fixed Rate Advances with Monthly Principal and Interest Payments [Member]
Debt Instrument [Line Items]
Long-term debt	$ 2,078,000	$ 2,397,000
Interest rate, period end (in hundredths)	2.82%