Transactions Involving Directors and Shareholders (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Analysis of activity of all such loans:
Outstanding balance, beginning of year	$ 9,588	$ 8,260
Credit granted and additional advances	3,008	2,786
Repayments	(3,199)	1,458
Outstanding balance, end of year	$ 9,397	$ 9,588