Loans And Allowance For Loan Losses (Total Average Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	$ 65,827	$ 76,167	$ 70,400	$ 79,231
Restructured loans (accruing)	70,426	67,716	67,103	65,602
Total	136,253	143,883	137,503	144,833
Commercial [Member]
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	58,662	69,104	63,113	72,186
Restructured loans (accruing)	50,102	46,037	45,164	44,495
Total	108,764	115,141	108,277	116,681
Personal Banking [Member]
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	7,165	7,063	7,287	7,045
Restructured loans (accruing)	20,324	21,679	21,939	21,107
Total	$ 27,489	$ 28,742	$ 29,226	$ 28,152