Investments - Summary of maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Held to Maturity, Amortized Cost
After one year, but within five	$ 4,758
After five years, but within ten	14,497
After ten Years	33,886
Total	53,141
Held to Maturity, Approximate Fair Value
After one year, but within five	4,870
After five years, but within ten	14,593
After ten Years	33,978
Total	53,441	$ 55,871
Available for sale, Amortized Cost
After one year, but within five	23,112
After five years, but within ten	9,845
After ten Years	32,916
Total	65,873
Available for sale, Fair Value
After one year, but within five	22,962
After five years, but within ten	9,702
After ten Years	32,448
Fair Value	65,112
Carrying value of investment securities pledged	$ 114,838