Allowance for Loan and Lease Losses and Unfunded Loan Commitments and Letters of Credit (Changes in the Allowance for Unfunded Commitments and Letters of Credit) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Allowance for Loan and Lease Losses and Unfunded Loan Commitments and Letters of Credit
Beginning Balance	$ 55,315	$ 56,981	$ 60,993	$ 53,478
Provision charged to expense	2,150	13,500	2,150	28,500
Loans charged off	(4,758)	(11,073)	(11,781)	(23,926)
Recoveries	1,350	340	2,695	1,696
Ending balance	54,057	59,748	54,057	59,748
Beginning balance	1,660	815	1,165	775
Net changes in the allowance for unfunded commitments and letters of credit	(200)	0	295	40
Ending balance	$ 1,460	$ 815	$ 1,460	$ 815