Loans (Narrative) (Details) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2011	Jun. 30, 2010	Mar. 31, 2011	Dec. 31, 2010	Mar. 31, 2010	Dec. 31, 2009
Loans held for sale	$ 1,637,000	$ 1,637,000			$ 2,873,000
Sale of Loans Held-for-sale	2,400,000
Net gains on sale of loans held-for-sale	109,000	(1,259,000)	(149,000)
Impaired Loans, Recorded Investment	374,383,000	374,383,000			381,992,000
Percentage of charge-off to contractual balances for impaired loans					23.30%
Percentage of loan and lease losses write offs	21.70%	21.70%
Allowance for credit losses associated with TDRs	229,900,000	229,900,000	255,650,000	241,030,000	245,231,000	233,120,000	211,889,000
Accruing Troubled Debt Restructuring [Member]
Allowance for credit losses associated with TDRs	1,700,000	1,700,000
Non-Accrual Troubled Debt Restructuring [Member]
Allowance for credit losses associated with TDRs	$ 1,200,000	$ 1,200,000