Derivatives - Designated as a cash flow hedge (Details) - Hedging Instrument [Member] $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016 USD ($) position	Dec. 31, 2015 USD ($) position	Oct. 23, 2010 USD ($)
Derivative [Line Items]
Notional amount			$ 5,200
Pay rate (as a percent)			2.59%
Interest Rate Swap [Member]
Derivative [Line Items]
Positions | position	1	1
Notional amount	$ 5,155	$ 5,155
Asset	0	0
Liability	$ 308	$ 226
Receive rate (as a percent)	0.71%	0.32%
Pay rate (as a percent)	2.59%	2.59%
Life (Years)	3 years 10 months 24 days	4 years 9 months 18 days
Pay fixed receive floating rate interest rate swap [Member]
Derivative [Line Items]
Positions | position	1	1
Notional amount	$ 10,000	$ 10,000
Asset	0	0
Liability	$ 138	$ 71
Receive rate (as a percent)	0.44%	0.23%
Pay rate (as a percent)	1.43%	1.43%
Life (Years)	2 years 1 month 6 days	3 years