Allowance For Loan Losses And Credit Quality Of Financing Receivables - Troubled Debt Restructured On Recorded Investment (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Financing Receivable, Modifications [Line Items]
Total investment in troubled debt	$ 3,073	$ 3,578
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Total investment in troubled debt	2,943	2,975
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Total investment in troubled debt	130	603
Performing [Member]
Financing Receivable, Modifications [Line Items]
Total investment in troubled debt	1,142	1,553
Performing [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Total investment in troubled debt	1,012	1,144
Performing [Member] | Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Total investment in troubled debt	130	409
Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Total investment in troubled debt	1,931	2,025
Non-performing [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Total investment in troubled debt	1,931	1,831
Non-performing [Member] | Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Total investment in troubled debt	$ 0	$ 194