Loans (Summary of TDRs) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Schedule of corporation's TDRs
Total TDRs	$ 98,232	$ 103,111	$ 99,428
Commercial Loan Portfolio [Member]
Schedule of corporation's TDRs
Total TDRs	74,085	78,823	74,751
Consumer Loan Portfolio [Member]
Schedule of corporation's TDRs
Total TDRs	24,147	24,288	24,677
Substandard Nonaccrual [Member]
Schedule of corporation's TDRs
Total TDRs	32,381	35,933	35,708
Substandard Nonaccrual [Member] | Commercial Loan Portfolio [Member]
Schedule of corporation's TDRs
Total TDRs	28,979	32,682	32,001
Substandard Nonaccrual [Member] | Consumer Loan Portfolio [Member]
Schedule of corporation's TDRs
Total TDRs	3,402	3,251	3,707
Nonperforming Financial Instruments [Member]
Schedule of corporation's TDRs
Total TDRs	16,473	19,368	17,912
Nonperforming Financial Instruments [Member] | Commercial Loan Portfolio [Member]
Schedule of corporation's TDRs
Total TDRs	14,240	16,297	14,547
Nonperforming Financial Instruments [Member] | Consumer Loan Portfolio [Member]
Schedule of corporation's TDRs
Total TDRs	2,233	3,071	3,365
Performing Financial Instruments [Member]
Schedule of corporation's TDRs
Total TDRs	49,378	47,810	45,808
Performing Financial Instruments [Member] | Commercial Loan Portfolio [Member]
Schedule of corporation's TDRs
Total TDRs	30,866	29,844	28,203
Performing Financial Instruments [Member] | Consumer Loan Portfolio [Member]
Schedule of corporation's TDRs
Total TDRs	$ 18,512	$ 17,966	$ 17,605