Core Deposit and Other Intangibles - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Jun. 12, 2015	Apr. 17, 2015
Business Acquisition [Line Items]
Measurement period adjustment		$ 2,142
Core deposit intangible and other intangibles reduction			742
Core deposit amortization		$ 3,910	2,835	$ 2,445
FMIG
Business Acquisition [Line Items]
Core deposit intangible and other intangibles reduction					$ 742
Merger with Ameriana Bancorp
Business Acquisition [Line Items]
Core deposit intangible			$ 5,342
Measurement period adjustment	$ 2,142
Merger with C Financial Corporation
Business Acquisition [Line Items]
Core deposit intangible						$ 981