Investment Securities, Held-to-maturity Securities, Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Amortized Cost [Abstract]
Due in one year or less	$ 0
Due in one year through five years	63,543
Due in five years through ten years	0
Amortized Cost	63,543	$ 70,946
Fair Value [Abstract]
Due in one year or less	0
Due in one year through five years	67,689
Due in five years through ten years	0
Fair Value	$ 67,689	$ 75,342