Core Deposit and Other Intangibles - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jun. 12, 2015	Apr. 17, 2015	Nov. 07, 2014
Business Acquisition [Line Items]
Core deposit intangible and other intangibles reduction	$ 742
Core deposit amortization	2,835	$ 2,445	$ 1,649
FMIG
Business Acquisition [Line Items]
Core deposit intangible and other intangibles reduction				$ 742
Merger with Ameriana Bancorp
Business Acquisition [Line Items]
Core deposit intangible	$ 3,200
Merger with C Financial Corporation
Business Acquisition [Line Items]
Core deposit intangible					$ 981
Merger with Community Bancshares, Inc.
Business Acquisition [Line Items]
Core deposit intangible						$ 4,658