Commitments (Summary Of Commitments To Extend Credit And Standby Letters Of Credit) (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Commitments to extend credit	$ 145,936	$ 130,646	$ 132,700
Standby letters of credit	$ 9,367	$ 6,889	$ 8,074