Loans (Summary of TDRs) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Schedule of corporation's TDRs
Total TDRs	$ 101,824	$ 101,322	$ 103,671
Commercial Loan Portfolio [Member]
Schedule of corporation's TDRs
Total TDRs	77,511	77,047	79,852
Consumer Loan Portfolio [Member]
Schedule of corporation's TDRs
Total TDRs	24,313	24,275	23,819
Performing [Member]
Schedule of corporation's TDRs
Total TDRs	45,981	45,664	41,823
Performing [Member] | Commercial Loan Portfolio [Member]
Schedule of corporation's TDRs
Total TDRs	28,784	29,179	28,123
Performing [Member] | Consumer Loan Portfolio [Member]
Schedule of corporation's TDRs
Total TDRs	17,197	16,485	13,700
Nonperforming [Member]
Schedule of corporation's TDRs
Total TDRs	18,500	18,467	17,462
Nonperforming [Member] | Commercial Loan Portfolio [Member]
Schedule of corporation's TDRs
Total TDRs	15,810	15,271	11,218
Nonperforming [Member] | Consumer Loan Portfolio [Member]
Schedule of corporation's TDRs
Total TDRs	2,690	3,196	6,244
Substandard Nonaccrual [Member]
Schedule of corporation's TDRs
Total TDRs	37,343	37,191	44,386
Substandard Nonaccrual [Member] | Commercial Loan Portfolio [Member]
Schedule of corporation's TDRs
Total TDRs	32,917	32,597	40,511
Substandard Nonaccrual [Member] | Consumer Loan Portfolio [Member]
Schedule of corporation's TDRs
Total TDRs	$ 4,426	$ 4,594	$ 3,875