Employee Benefit and Deferred Compensation Plans - (Details 1) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Pension Benefits
Plan expense for noncontributory benefit pension plan and post-retirement health and life plans
Service cost	$ 0	$ 0
Interest cost	293	306
Expected (return) on plan assets	(484)	(469)
Prior service cost recognized	0	0
Recognized actuarial loss	100	100
Settlement/curtailment/termination gains	0	0
Net periodic benefit cost (return)	(91)	(63)
Pension Benefits | Heritage Financial Group
Plan expense for noncontributory benefit pension plan and post-retirement health and life plans
Service cost	0	0
Interest cost	0	69
Expected (return) on plan assets	0	(45)
Prior service cost recognized	0	0
Recognized actuarial loss	0	0
Settlement/curtailment/termination gains	0	0
Net periodic benefit cost (return)	0	24
Other Benefits
Plan expense for noncontributory benefit pension plan and post-retirement health and life plans
Service cost	3	4
Interest cost	13	14
Expected (return) on plan assets	0	0
Prior service cost recognized	0	0
Recognized actuarial loss	13	17
Settlement/curtailment/termination gains	0	0
Net periodic benefit cost (return)	$ 29	$ 35