Loans - (Additional Information Related to Accruing TDR's) (Details) - Accruing TDR [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Loans [Line Items]
Recorded investment	$ 5,767	$ 8,436
Average year-to- date recorded investment	6,017	8,594
Unpaid principal balance	6,030	8,485
Unfunded commitments to fund TDRs	102	165
Commercial [Member]
Loans [Line Items]
Recorded investment	3,302	5,874
Average year-to- date recorded investment	3,440	5,951
Unpaid principal balance	3,464	5,918
Unfunded commitments to fund TDRs	100	163
Commercial Real Estate [Member]
Loans [Line Items]
Recorded investment	538	388
Average year-to- date recorded investment	572	394
Unpaid principal balance	590	389
Residential Real Estate Segment [Member]
Loans [Line Items]
Recorded investment	1,920	2,162
Average year-to- date recorded investment	1,996	2,234
Unpaid principal balance	1,969	2,166
Unfunded commitments to fund TDRs	2	2
Consumer [Member]
Loans [Line Items]
Recorded investment	7	12
Average year-to- date recorded investment	9	15
Unpaid principal balance	$ 7	$ 12