Employee Benefit and Deferred Compensation Plans - (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Pension Benefits
Plan expense for noncontributory benefit pension plan and post-retirement health and life plans
Service cost (return)	$ 0	$ 0
Interest cost (return)	306	271
Expected (return) on plan assets	(469)	(511)
Prior service cost recognized	0	0
Recognized actuarial loss (gain)	100	73
Net periodic benefit cost (return)	(63)	(167)
Pension Benefits | Heritage Financial Group
Plan expense for noncontributory benefit pension plan and post-retirement health and life plans
Service cost (return)	0	0
Interest cost (return)	69	0
Expected (return) on plan assets	(45)	0
Prior service cost recognized	0	0
Recognized actuarial loss (gain)	0	0
Net periodic benefit cost (return)	24	0
Other Benefits
Plan expense for noncontributory benefit pension plan and post-retirement health and life plans
Service cost (return)	4	4
Interest cost (return)	14	15
Expected (return) on plan assets	0	0
Prior service cost recognized	0	0
Recognized actuarial loss (gain)	17	20
Net periodic benefit cost (return)	$ 35	$ 39