Core Deposit and Other Intangibles - Narrative (Details) - USD ($)	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2016	Sep. 30, 2016	Dec. 31, 2015	Jun. 12, 2015	Apr. 17, 2015
Finite-Lived Intangible Assets [Line Items]
Measurement period adjustment		$ 2,142,000
FMIG
Finite-Lived Intangible Assets [Line Items]
Other intangible reduction				$ 742,000
Ameriana
Finite-Lived Intangible Assets [Line Items]
Core deposit intangible			$ 5,342,000
Measurement period adjustment	$ 2,142,000
C Financial
Finite-Lived Intangible Assets [Line Items]
Core deposit intangible					$ 981,000