Employee Benefit and Deferred Compensation Plans (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Change in benefit obligation
Benefit obligation at beginning of year	$ 28,087,000
Settlements	0	$ 0
Benefit obligation at end of year	27,856,000	28,087,000
Change in fair value of plan assets
Fair value of plan assets at beginning of year	26,532,000
Contribution by employer	0	0
Settlements	0	0
Fair value of plan assets at end of year	36,892,000	26,532,000
Pension Benefits Renasant
Change in benefit obligation
Benefit obligation at beginning of year	28,087,000	27,364,000
Service cost	0	0	$ 0
Interest cost	1,095,000	1,292,000	899,000
Plan participants’ contributions	0	0
Actuarial loss (gain)	605,000	2,601,000
Benefits paid	(1,931,000)	(3,170,000)
Addition from business combination	0	0
Benefit obligation at end of year	27,856,000	28,087,000	27,364,000
Change in fair value of plan assets
Fair value of plan assets at beginning of year	26,532,000	27,989,000
Actual return on plan assets	(167,000)	1,713,000
Contribution by employer	0	0
Benefits paid	(1,931,000)	(3,170,000)
Addition from business combination	0	0
Fair value of plan assets at end of year	24,434,000	26,532,000	27,989,000
Funded status at end of year	$ (3,422,000)	$ (1,555,000)
Weighted-average assumptions as of December 31
Discount rate (percent)	4.56%	4.00%
Other Benefits
Change in benefit obligation
Benefit obligation at beginning of year	$ 1,941,000	$ 2,082,000
Service cost	17,000	14,000	28,000
Interest cost	60,000	84,000	70,000
Plan participants’ contributions	82,000	77,000
Actuarial loss (gain)	(37,000)	(118,000)
Benefits paid	(359,000)	(198,000)
Addition from business combination	0	0
Benefit obligation at end of year	1,704,000	1,941,000	2,082,000
Change in fair value of plan assets
Benefits paid	(359,000)	(198,000)
Funded status at end of year	$ (1,704,000)	$ (1,941,000)
Weighted-average assumptions as of December 31
Discount rate (percent)	3.63%	3.22%
HeritageBank
Change in benefit obligation
Settlements	$ (2,187,000)	$ 0
Benefit obligation at end of year	12,913,000
Change in fair value of plan assets
Settlements	(2,187,000)	0
HeritageBank | Pension Benefits Renasant
Change in benefit obligation
Benefit obligation at beginning of year	0	0
Service cost	0	0
Interest cost	305,000	0
Plan participants’ contributions	0	0
Actuarial loss (gain)	(685,000)	0
Benefits paid	(15,000)	0
Addition from business combination	15,495,000	0
Benefit obligation at end of year	12,913,000	0	0
Change in fair value of plan assets
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	(21,000)	0
Contribution by employer	0	0
Benefits paid	(15,000)	0
Addition from business combination	14,681,000	0
Fair value of plan assets at end of year	12,458,000	0	$ 0
Funded status at end of year	$ (455,000)	$ 0
Weighted-average assumptions as of December 31
Discount rate (percent)	4.27%