Loans and Allowance for Loan Losses (Average Impaired Loans) (Details) (USD $) In Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Jun. 30, 2011	Dec. 31, 2010
Non-accrual loans	$ 76,167	$ 79,231
Restructured loans	67,716	65,602
Total	143,883	144,833	173,000
Commercial [Member]
Non-accrual loans	69,104	72,186
Restructured loans	46,037	44,495
Total	115,141	116,681
Personal Banking [Member]
Non-accrual loans	7,063	7,045
Restructured loans	21,679	21,107
Total	$ 28,742	$ 28,152