Derivatives - Two-way client interest rate swaps not designated as either fair value or cash flow hedges (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015 USD ($) position	Dec. 31, 2014 USD ($) position
Derivative [Line Items]
Notional Amount	$ 11,074	$ 11,498
Asset	136	50
Liability	$ 136	$ 50
Life (Years)
Pay fixed - receive floating interest rate swap [Member] | Interest Rate Swap One [Member]
Derivative [Line Items]
Positions | position	1	1
Notional Amount	$ 3,821	$ 4,002
Asset	0	0
Liability	$ 62	$ 19
Rate	3.90%	3.90%
Rate	2.00%	2.00%
Life (Years)	12 years	12 years 10 months 24 days
Pay fixed - receive floating interest rate swap [Member] | Interest Rate Swap Two [Member]
Derivative [Line Items]
Positions | position	1	1
Notional Amount	$ 1,716	$ 1,747
Asset	0	0
Liability	$ 74	$ 31
Rate	4.09%	4.09%
Rate	1.80%	1.80%
Life (Years)	9 years	9 years 10 months 24 days
Reverse Interest Rate Swap [Member] | Interest Rate Swap One [Member]
Derivative [Line Items]
Positions | position	1	1
Notional Amount	$ 3,821	$ 4,002
Asset	62	19
Liability	$ 0	$ 0
Rate	3.90%	3.90%
Rate	2.00%	2.00%
Life (Years)	12 years	12 years 10 months 24 days
Reverse Interest Rate Swap [Member] | Interest Rate Swap Two [Member]
Derivative [Line Items]
Positions | position	1	1
Notional Amount	$ 1,716	$ 1,747
Asset	74	31
Liability	$ 0	$ 0
Rate	4.09%	4.09%
Rate	1.80%	1.80%
Life (Years)	9 years	9 years 10 months 24 days