Loans (Summary of TDRs) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Modifications [Line Items]
Total TDRs	$ 77,888	$ 93,066
Commercial Loan Portfolio
Financing Receivable, Modifications [Line Items]
Total TDRs	58,842	70,785
Consumer Loan Portfolio
Financing Receivable, Modifications [Line Items]
Total TDRs	19,046	22,281
Accruing TDRs
Financing Receivable, Modifications [Line Items]
Total TDRs	48,782	62,535
Accruing TDRs | Commercial Loan Portfolio
Financing Receivable, Modifications [Line Items]
Total TDRs	34,484	45,388
Accruing TDRs | Consumer Loan Portfolio
Financing Receivable, Modifications [Line Items]
Total TDRs	14,298	17,147
Nonaccrual TDRs
Financing Receivable, Modifications [Line Items]
Total TDRs	29,106	30,531
Nonaccrual TDRs | Commercial Loan Portfolio
Financing Receivable, Modifications [Line Items]
Total TDRs	24,358	25,397
Nonaccrual TDRs | Consumer Loan Portfolio
Financing Receivable, Modifications [Line Items]
Total TDRs	$ 4,748	$ 5,134