Borrowed Funds - FHLB Advances, Trust Preferred Securities (Narrative) (Details) (USD $)	0 Months Ended	12 Months Ended
	Nov. 01, 2007	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 American Community	Dec. 31, 2011 American Community	Apr. 16, 2009 American Community	Dec. 31, 2012 3-Month LIBOR	Apr. 16, 2009 3-Month LIBOR American Community
Debt Disclosure [Abstract]
Lendable collateral value, collateralizing Federal Home Loan Bank advances		$ 57,900,000
Lendable collateral value, collateralizing Federal Home Loan Bank advances, remaining available		31,900,000.0
Federal Home Loan Bank, advances, Maximum available, as a percent of bank assets		20.00%
Federal Home Loan Bank, advances, activity for year, average interest rate for year		2.61%	2.27%
Federal Home Loan Bank, advances, weighted average interest rate		2.57%	2.62%
Federal Home Loan Bank, advances, maximum outstanding at any month end		26,977,842	39,010,883
Debt instrument, interest rate, effective percentage		1.63%	1.87%
Proceeds from issuance of trust preferred securities	25,000,000
Trust preferred securities, maturity	30 years
Trust preferred securities, called by the Trust without penalty, term	5 years
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate							1.32%
Liabilities assumed, noncurrent liabilities, long-term debt						$ 10,000,000
Preferred securities cumulative cash distributions quarterly, spread on variable rate								2.80%
Interest rate at period end				3.11%	3.38%