Renasant Corporation (Parent Company Only) Condensed Financial Information (Details 1) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income
Other dividends									$ 2,314	$ 459	$ 215
Total income	$ 32,441	$ 33,413	$ 34,265	$ 32,021	$ 30,255	$ 38,272	$ 35,586	$ 33,302	132,140	137,415	108,270
Expenses	11,325	10,678	7,976	7,874	7,791	7,301	6,851	6,205	37,853	28,147	21,665
Income before income tax benefit and equity in undistributed net income of bank subsidiary	46,745	40,620	37,277	35,227	35,096	34,885	34,054	31,742	159,869	135,777	99,764
Income tax benefit	30,234	14,199	11,993	11,255	11,461	11,706	11,154	10,526	67,681	44,847	31,750
Net income	$ 16,511	$ 26,421	$ 25,284	$ 23,972	$ 23,635	$ 23,179	$ 22,900	$ 21,216	92,188	90,930	68,014
Renasant Corporation
Income
Dividends from bank subsidiary									34,416	29,733	24,557
Interest income from bank subsidiary									8	8	7
Other dividends									94	469	266
Other income									588	1,275	58
Total income									35,106	31,485	24,888
Expenses									12,649	9,036	6,823
Income before income tax benefit and equity in undistributed net income of bank subsidiary									22,457	22,449	18,065
Income tax benefit									(3,761)	(2,890)	(2,521)
Equity in undistributed net income of bank subsidiary									65,970	65,591	47,428
Net income									$ 92,188	$ 90,930	$ 68,014