Investment Securities, Contractual and Expected Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Amortized cost, by contractual maturity [Abstract]
Due in one year or less	$ 13,680
Due after one year through five years	157,850
Due after five years through ten years	10,348
Due after ten years	1,223
Amortized cost	183,101	$ 150,055
Estimated fair value, by contractual maturity [Abstract]
Due in one year or less	13,686
Due after one year through five years	157,812
Due after five years through ten years	10,589
Due after ten years	1,264
Estimated fair value	183,351	$ 151,226
Mortgage backed securities and collateralized mortgage obligations with expected maturities due after one year through five years	$ 101,992