Long-Term Debt (Narrative) (Details) (USD $)	9 Months Ended
	Sep. 30, 2014 F&M Bank [Member]	Sep. 30, 2014 Prosperity Bank [Member]	Dec. 31, 2013 Prosperity Bank [Member]
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	$ 40,000,000
Credit facility current borrowing capacity	14,300,000
Interest rate per annum	3.75%
Rate above prime	0.50%
Credit facility maturity date	Jan. 27, 2016
Loans and letters of credit amount outstanding		$ 780,000	$ 3,300,000