Loans (Summary Of Impaired Financial Receivables (Summary Of Non-Covered Impaired Loans)) (Detail) (USD $)	6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Nonaccrual loans	$ 200,000
Troubled debt restructurings not included above	28,200,000		26,100,000
Non-Covered Loans
Nonaccrual loans	44,421,000	60,545,000	70,823,000
Troubled debt restructurings not included above	22,970,000	21,756,000	17,951,000
Total impaired loans	67,391,000	66,973,000	88,774,000
Impaired loans not requiring a related allowance
Impaired loans requiring a related allowance	67,391,000	66,973,000	88,774,000
Allowance related to impaired loans	7,136,000	15,328,000	18,478,000
Average investment in impaired loans	78,432,000	76,136,000	88,320,000
Interest income recognized on impaired loans	153,000	150,000	637,000
Foregone interest income on impaired loans	$ 332,000	$ 249,000	$ 613,000