Loans (Schedule Of Nonaccrual Loans) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Impaired loans $ 59,499 $ 73,299
Consumer [Member]
   
Impaired loans 4 6
Nonperforming Financing Receivable [Member]
   
Impaired loans 46,670 44,723
Nonperforming Financing Receivable [Member] | Closed End [Member]
   
Impaired loans 1,974 95
Nonperforming Financing Receivable [Member] | Line of Credit [Member]
   
Impaired loans 1,216 1,222
Nonperforming Financing Receivable [Member] | Agriculture & AGRE [Member]
   
Impaired loans 126 65
Nonperforming Financing Receivable [Member] | Construction, Land & Development [Member]
   
Impaired loans 15,083 23,738
Nonperforming Financing Receivable [Member] | Owner Occupied [Member]
   
Impaired loans 13,661 8,633
Nonperforming Financing Receivable [Member] | Non-owner Occupied [Member]
   
Impaired loans 6,232 6,572
Nonperforming Financing Receivable [Member] | Senior Lien [Member]
   
Impaired loans 7,820 3,588
Nonperforming Financing Receivable [Member] | Junior Liens & Lines Of Credit [Member]
   
Impaired loans 558 806
Nonperforming Financing Receivable [Member] | Consumer [Member]
   
Impaired loans    $ 4