Fair Value (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended			12 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Fair Value, Measurements, Nonrecurring [Member] Foreclosed Properties [Member]	Dec. 31, 2011 Fair Value, Measurements, Nonrecurring [Member] Foreclosed Properties [Member]	Sep. 30, 2012 Fair Value, Measurements, Nonrecurring [Member] Impaired Loans [Member]	Dec. 31, 2011 Fair Value, Measurements, Nonrecurring [Member] Impaired Loans [Member]
Balance at December 31, 2011					$ 1,885	$ 3,024	$ 8,933	$ 9,433
Total net gain (losses) for the year included in:
Gain (loss) on sale of foreclosed properties					(131)	459	0	0
Other comprehensive gain (loss)	397	315	1,184	1,030	0	0	0	0
Purchase and sales, net					(422)	(2,625)	0	0
Net transfers in (out)			1,598	1,804	1,598	1,804	(2,906)	218
Valuation allowance					(27)	(777)	0	(718)
Balance at September 30, 2012 - Unaudited					$ 2,903	$ 1,885	$ 6,027	$ 8,933