Loans (Summary of TDRs) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Schedule of corporation's TDRs
Total nonperforming TDRs	$ 103,671	$ 94,943	$ 96,651
Commercial Loan Portfolio [Member]
Schedule of corporation's TDRs
Total nonperforming TDRs	79,852	72,214	74,439
Consumer Loan Portfolio [Member]
Schedule of corporation's TDRs
Total nonperforming TDRs	23,819	22,729	22,212
Performing [Member]
Schedule of corporation's TDRs
Total nonperforming TDRs	41,823	39,571	30,723
Performing [Member] | Commercial Loan Portfolio [Member]
Schedule of corporation's TDRs
Total nonperforming TDRs	28,123	26,839	17,755
Performing [Member] | Consumer Loan Portfolio [Member]
Schedule of corporation's TDRs
Total nonperforming TDRs	13,700	12,732	12,968
Nonperforming [Member]
Schedule of corporation's TDRs
Total nonperforming TDRs	17,462	18,090	18,915
Nonperforming [Member] | Commercial Loan Portfolio [Member]
Schedule of corporation's TDRs
Total nonperforming TDRs	11,218	13,414	14,587
Nonperforming [Member] | Consumer Loan Portfolio [Member]
Schedule of corporation's TDRs
Total nonperforming TDRs	6,244	4,676	4,328
Substandard Nonaccrual [Member]
Schedule of corporation's TDRs
Total nonperforming TDRs	44,386	37,282	47,013
Substandard Nonaccrual [Member] | Commercial Loan Portfolio [Member]
Schedule of corporation's TDRs
Total nonperforming TDRs	40,511	31,961	42,097
Substandard Nonaccrual [Member] | Consumer Loan Portfolio [Member]
Schedule of corporation's TDRs
Total nonperforming TDRs	$ 3,875	$ 5,321	$ 4,916