Loans and Allowance - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale	$ 2,929				$ 9,894				$ 2,929	$ 9,894
Allowance for loan losses	66,037				62,453				66,037	62,453	$ 63,964	$ 67,870
Increase in allowance for loan losses									3,584
Net charge offs									2,073
Increase in net charge offs									145
Provision for loan losses	2,417	$ 1,900	$ 790	$ 550			$ 417		5,657	417	2,560
Increase in provision for loan losses									5,240
Commercial impaired loan total	72,050				97,527				$ 72,050	97,527	116,223
Merger with Ameriana Bancorp
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial impaired loan total					11,365					11,365
Merger with C Financial Corporation
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial impaired loan total					1,841					1,841
Merger with Community Bancshares, Inc.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial impaired loan total											17,027
Commercial and farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of troubled debt restructured loans									56.00%
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	11,755				11,139				$ 11,755	11,139	13,152	15,077
Provision for loan losses									1,515	310	(839)
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	2,923				2,689				2,923	2,689	2,658	$ 2,515
Provision for loan losses									432	299	$ 423
Mortgage loans for which formal foreclosure proceedings are in process	$ 1,530				$ 1,391				$ 1,530	$ 1,391