Investment Securities - MBS Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Available for sale securities, Amortized cost
Due one year or less	$ 43,127	$ 51,049
Due after one year through five years	147,891	153,444
Due after five years through ten years	187,652	182,996
Due after ten years	83,743	62,642
Total	462,413	450,131
Available for sale securities, Fair Value
Due one year or less	43,015	50,978
Due after one year through five years	147,201	152,916
Due after five years through ten years	186,296	184,870
Due after ten years	82,305	62,171
Total	458,817	450,935
Securities pledged to secure public deposits
Available for sale securities, Amortized cost
Total	184,800	153,900
Available for sale securities, Fair Value
Total	$ 183,800	$ 155,200