Loans - (Additional Information Related to Accruing TDR's) (Details) - Accruing TDR [Member] - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Loans [Line Items]
Recorded investment	$ 5,177	$ 5,767
Average year-to- date recorded investment	5,235	6,017
Unpaid principal balance	5,470	6,030
Unfunded commitments to fund TDRs	102	102
Commercial [Member]
Loans [Line Items]
Recorded investment	3,258	3,302
Average year-to- date recorded investment	3,270	3,440
Unpaid principal balance	3,488	3,464
Unfunded commitments to fund TDRs	100	100
Commercial Real Estate [Member]
Loans [Line Items]
Recorded investment	491	538
Average year-to- date recorded investment	510	572
Unpaid principal balance	543	590
Residential Real Estate Segment [Member]
Loans [Line Items]
Recorded investment	1,424	1,920
Average year-to- date recorded investment	1,450	1,996
Unpaid principal balance	1,435	1,969
Unfunded commitments to fund TDRs	2	2
Consumer [Member]
Loans [Line Items]
Recorded investment	4	7
Average year-to- date recorded investment	5	9
Unpaid principal balance	$ 4	$ 7