Derivatives - Derivatives designated as cash flow hedges (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) position	Dec. 31, 2015 USD ($) position	Dec. 31, 2010 USD ($)
Derivative [Line Items]
Notional Amount	$ 10,342	$ 10,932
Life (Years)
Interest Rate Swap One [Member] | Hedging Instrument [Member]
Derivative [Line Items]
Number of positions | position	1	1
Notional Amount	$ 5,155	$ 5,155	$ 5,200
Asset	0	0
Liability	$ 160	$ 226
Receive Rate (as a percent)	0.87%	0.32%
Pay Rate (as a percent)	2.59%	2.59%	2.59%
Life (Years)	3 years 9 months 18 days	4 years 9 months 18 days
Interest Rate Swap Two [Member] | Hedging Instrument [Member]
Derivative [Line Items]
Number of positions | position	1	1
Notional Amount	$ 10,000	$ 10,000
Asset	0	0
Liability	$ 38	$ 71
Receive Rate (as a percent)	0.60%	0.23%
Pay Rate (as a percent)	1.43%	1.43%
Life (Years)	2 years	3 years