Allowance For Loan Losses And Credit Quality Of Financing Receivables - Loans Which The Accrual Of Interest Has Been Discontinued (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans for which accrual of interest has been discounted	$ 4,583	$ 5,312
Commercial And Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans for which accrual of interest has been discounted	20	20
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans for which accrual of interest has been discounted	3,171	4,016
Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans for which accrual of interest has been discounted	1,392	1,138
Consumer And Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans for which accrual of interest has been discounted	$ 0	$ 138