Significant Accounting Policies (Details Textual)	9 Months Ended	12 Months Ended
	Sep. 30, 2015 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Apr. 01, 2016 USD ($)	Jul. 01, 2015 USD ($) agreement
Accounting Policies [Abstract]
Date of discontinued recognition of interest on mortgage and commercial loans		90 days
Consumer and other retail loan due date		120 days
Minimum duration for past due residential loans to be considered as nonperforming		90 days
Payments made to FDIC to terminate loss share agreements		$ 4,849,000	$ 0	$ 0
Previously covered loans		28,090,000
Previously covered OREO		487,000
Significant Accounting Policies (Textual) [Abstract]
MSR impairment (recovery)	$ 0	40,000	0
Impairment of company's goodwill		$ 0	$ 0	$ 0
Lock in period for interest rates		45 days
Premises
Significant Accounting Policies (Textual) [Abstract]
Estimated life (in years)		40 years
Furniture and equipment
Significant Accounting Policies (Textual) [Abstract]
Estimated life (in years)		7 years
Maximum | Computer equipment
Significant Accounting Policies (Textual) [Abstract]
Estimated life (in years)		5 years
Minimum | Computer equipment
Significant Accounting Policies (Textual) [Abstract]
Estimated life (in years)		3 years
KeyWorth Bank
Significant Accounting Policies (Textual) [Abstract]
Cash surrender value of life insurance					$ 8,376,000
Heritage Financial Group
Significant Accounting Policies (Textual) [Abstract]
Number of loss sharing agreements acquired | agreement						2
Cash surrender value of life insurance						$ 25,297,000
Heritage Financial Group | Federal
Significant Accounting Policies (Textual) [Abstract]
Operating loss carryforwards		$ 6,883,000				$ 18,321,000