Loans And Allowance For Loan Losses (Total Average Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	$ 58,958	$ 76,287	$ 66,558	$ 78,239
Restructured loans (accruing)	61,635	64,515	65,267	65,236
Total	120,593	140,802	131,825	143,475
Commercial [Member]
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	51,337	68,554	59,159	70,962
Restructured loans (accruing)	41,885	41,993	44,063	43,652
Total	93,222	110,547	103,222	114,614
Personal Banking [Member]
Loans And Allowance For Loan Losses [Line Items]
Non-accrual loans	7,621	7,733	7,399	7,277
Restructured loans (accruing)	19,750	22,522	21,204	21,584
Total	$ 27,371	$ 30,255	$ 28,603	$ 28,861