Loans (Summary of TDRs) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Schedule of corporation's TDRs
Total nonperforming TDRs	$ 52,944	$ 48,566	$ 40,861
Commercial Loan Portfolio [Member]
Schedule of corporation's TDRs
Total nonperforming TDRs	35,213	29,665	21,303
Consumer Loan Portfolio [Member]
Schedule of corporation's TDRs
Total nonperforming TDRs	17,731	18,901	19,558
Performing [Member]
Schedule of corporation's TDRs
Total nonperforming TDRs	34,071	31,369	30,406
Performing [Member] | Commercial Loan Portfolio [Member]
Schedule of corporation's TDRs
Total nonperforming TDRs	19,469	15,789	14,750
Performing [Member] | Consumer Loan Portfolio [Member]
Schedule of corporation's TDRs
Total nonperforming TDRs	14,602	15,580	15,656
Nonperforming [Member]
Schedule of corporation's TDRs
Total nonperforming TDRs	18,873	17,197	10,455
Nonperforming [Member] | Commercial Loan Portfolio [Member]
Schedule of corporation's TDRs
Total nonperforming TDRs	15,744	13,876	6,553
Nonperforming [Member] | Consumer Loan Portfolio [Member]
Schedule of corporation's TDRs
Total nonperforming TDRs	$ 3,129	$ 3,321	$ 3,902