Investment Securities Held to Maturity Securities by Type (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities	$ 131,780
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	5
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(1,331)
Securities held to maturity, fair value	130,454	$ 0
Residential Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities	118,762
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(1,117)
Securities held to maturity, fair value	117,645
Obligations of States and Political Subdivisions [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities	13,018
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	5
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(214)
Securities held to maturity, fair value	$ 12,809