Derivatives - Two-way client interest rate swaps not designated as either fair value or cash flow hedges (Details) - Not Designated as Hedging Instrument [Member] $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016 USD ($) position	Dec. 31, 2015 USD ($) position
Derivative [Line Items]
Notional amount	$ 10,492	$ 10,932
Asset	287	73
Liability	$ 287	$ 73
Life (Years)
Interest Rate Swap [Member] | Interest Rate Swap One [Member]
Derivative [Line Items]
Positions | position	1	1
Notional amount	$ 3,572	$ 3,760
Asset	0	0
Liability	$ 156	$ 21
Rate	3.90%	3.90%
Life (Years)	11 years	11 years 10 months 24 days
Interest Rate Swap [Member] | Interest Rate Swap Two [Member]
Derivative [Line Items]
Positions | position	1	1
Notional amount	$ 1,674	$ 1,706
Asset	0	0
Liability	$ 131	$ 52
Rate	4.09%	4.09%
Life (Years)	8 years	8 years 10 months 24 days
Reverse Interest Rate Swap [Member] | Interest Rate Swap One [Member]
Derivative [Line Items]
Positions | position	1	1
Notional amount	$ 3,572	$ 3,760
Asset	156	21
Liability	$ 0	$ 0
Rate	3.90%	3.90%
Life (Years)	11 years	11 years 10 months 24 days
Reverse Interest Rate Swap [Member] | Interest Rate Swap Two [Member]
Derivative [Line Items]
Positions | position	1	1
Notional amount	$ 1,674	$ 1,706
Asset	131	52
Liability	$ 0	$ 0
Rate	4.09%	4.09%
Life (Years)	8 years	8 years 10 months 24 days
London Interbank Offered Rate (LIBOR) [Member] | Interest Rate Swap [Member] | Interest Rate Swap One [Member]
Derivative [Line Items]
Rate	2.00%	2.00%
London Interbank Offered Rate (LIBOR) [Member] | Interest Rate Swap [Member] | Interest Rate Swap Two [Member]
Derivative [Line Items]
Rate	1.80%	1.80%
London Interbank Offered Rate (LIBOR) [Member] | Reverse Interest Rate Swap [Member] | Interest Rate Swap One [Member]
Derivative [Line Items]
Rate	2.00%	2.00%
London Interbank Offered Rate (LIBOR) [Member] | Reverse Interest Rate Swap [Member] | Interest Rate Swap Two [Member]
Derivative [Line Items]
Rate	1.80%	1.80%