Investment securities available for sale (Details 2) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Securities in a Loss Position for Less Than 12 Months, Fair Value	$ 36,741	$ 22,204
Securities in a Loss Position for Less Than 12 Months, Unrealized Losses	(260)	(386)
Securities in a Loss Position for More Than 12 Months, Fair Value	2,852	15,612
Securities in a Loss Position for More Than 12 Months, Unrealized Losses	(16)	(280)
Total Fair Value	39,593	37,816
Total Unrealized Losses	(276)	(666)
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities in a Loss Position for Less Than 12 Months, Fair Value	27,291	18,598
Securities in a Loss Position for Less Than 12 Months, Unrealized Losses	(213)	(329)
Securities in a Loss Position for More Than 12 Months, Fair Value	2,852	15,115
Securities in a Loss Position for More Than 12 Months, Unrealized Losses	(16)	(244)
Total Fair Value	30,143	33,713
Total Unrealized Losses	(229)	(573)
Municipals [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities in a Loss Position for Less Than 12 Months, Fair Value		707
Securities in a Loss Position for Less Than 12 Months, Unrealized Losses		(14)
Securities in a Loss Position for More Than 12 Months, Fair Value		497
Securities in a Loss Position for More Than 12 Months, Unrealized Losses		(36)
Total Fair Value		1,204
Total Unrealized Losses		(50)
Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities in a Loss Position for Less Than 12 Months, Fair Value	9,450	2,899
Securities in a Loss Position for Less Than 12 Months, Unrealized Losses	(47)	(43)
Securities in a Loss Position for More Than 12 Months, Fair Value	0	0
Securities in a Loss Position for More Than 12 Months, Unrealized Losses	0	0
Total Fair Value	9,450	2,899
Total Unrealized Losses	$ (47)	$ (43)