Loans (Non-Accrual Loans, Segregated by Class of Loans) (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010
Non-accrual loans	$ 131	$ 137	$ 135
Commercial And Industrial, Energy [Member]
Non-accrual loans			1,430
Commercial And Industrial, Other Commercial [Member]
Non-accrual loans	73,686	60,408	58,072
Commercial Real Estate, Buildings, Land And Other [Member]
Non-accrual loans	49,787	64,213	63,577
Commercial Real Estate, Construction [Member]
Non-accrual loans	2,942	9,299	7,821
Consumer Real Estate [Member]
Non-accrual loans	3,683	2,758	3,005
Consumer And Other [Member]
Non-accrual loans	$ 430	$ 462	$ 619