Loans - (Summary of Company's Carrying Value of Non-Accrual TDR's) (Details) - Non-Accruing TDR [Member] - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Loans [Line Items]
Carrying Value of Non - Accruing TDR's	$ 9,600	$ 16,708
Commercial [Member]
Loans [Line Items]
Carrying Value of Non - Accruing TDR's	8,143	15,265
Residential Real Estate Segment [Member]
Loans [Line Items]
Carrying Value of Non - Accruing TDR's	1,284	1,301
Consumer [Member]
Loans [Line Items]
Carrying Value of Non - Accruing TDR's	$ 173	$ 142