Employee Benefit and Deferred Compensation Plans - (Details 1) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Pension Benefits
Plan expense for noncontributory benefit pension plan and post-retirement health and life plans
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	291	302	584	608
Expected return on plan assets	(487)	(467)	(971)	(936)
Recognized actuarial loss	100	102	200	202
Net periodic benefit (return) cost	(96)	(63)	(187)	(126)
Pension Benefits | Heritage Financial Group
Plan expense for noncontributory benefit pension plan and post-retirement health and life plans
Service cost	0	0	0	0
Interest cost	0	69	0	138
Expected return on plan assets	0	(45)	0	(90)
Recognized actuarial loss	0	0	0	0
Net periodic benefit (return) cost	0	24	0	48
Other Benefits
Plan expense for noncontributory benefit pension plan and post-retirement health and life plans
Service cost	1	4	4	8
Interest cost	8	15	21	29
Expected return on plan assets	0	0	0	0
Recognized actuarial loss	(10)	17	3	34
Net periodic benefit (return) cost	$ (1)	$ 36	$ 28	$ 71