Commitments (Summary Of Commitments To Extend Credit And Standby Letters Of Credit) (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Commitments to extend credit	$ 143,890	$ 124,528	$ 132,700
Standby letters of credit	$ 9,039	$ 9,117	$ 8,074