Premises and Equipment - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Apr. 17, 2015
Premises and Equipment [Line Items]
Rent expense	$ 4,586	$ 3,456	$ 3,258
Merger with Ameriana Bancorp
Premises and Equipment [Line Items]
Premises and equipment acquired		$ 13,946
Merger with C Financial Corporation
Premises and Equipment [Line Items]
Premises and equipment acquired				$ 7,290