Loans (Summary of TDRs) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Schedule of corporation's TDRs
Total nonperforming TDRs	$ 55,043	$ 48,566	$ 42,172
Commercial Loan Portfolio [Member]
Schedule of corporation's TDRs
Total nonperforming TDRs	37,637	29,665	23,773
Consumer Loan Portfolio [Member]
Schedule of corporation's TDRs
Total nonperforming TDRs	17,406	18,901	18,399
Performing [Member]
Schedule of corporation's TDRs
Total nonperforming TDRs	32,657	31,369	26,383
Performing [Member] | Commercial Loan Portfolio [Member]
Schedule of corporation's TDRs
Total nonperforming TDRs	18,497	15,789	12,082
Performing [Member] | Consumer Loan Portfolio [Member]
Schedule of corporation's TDRs
Total nonperforming TDRs	14,160	15,580	14,301
Nonperforming [Member]
Schedule of corporation's TDRs
Total nonperforming TDRs	22,386	17,197	15,789
Nonperforming [Member] | Commercial Loan Portfolio [Member]
Schedule of corporation's TDRs
Total nonperforming TDRs	19,140	13,876	11,691
Nonperforming [Member] | Consumer Loan Portfolio [Member]
Schedule of corporation's TDRs
Total nonperforming TDRs	$ 3,246	$ 3,321	$ 4,098