2. Investment securities (Details 2) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Fair Value Less than 12 Months	$ 2,000	$ 6,056
Unrealized Losses Less than 12 Months	$ (1)	$ (11)
Fair Value More than 12 Months
Unrealized Losses More than 12 Months
Fair Value Total	$ 2,000	$ 6,056
Unrealized Losses Total	(1)	(11)
Government sponsored Enterprises [Member]
Fair Value Less than 12 Months	2,000	6,056
Unrealized Losses Less than 12 Months	$ (1)	$ (11)
Fair Value More than 12 Months
Unrealized Losses More than 12 Months
Fair Value Total	$ 2,000	$ 6,056
Unrealized Losses Total	$ (1)	$ (11)