Renasant Corporation (Parent Company Only) Condensed Financial Information (Details 2) - USD ($) $ in Thousands	3 Months Ended											12 Months Ended
	Dec. 31, 2015		Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015		Dec. 31, 2014		Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Operating activities
Net income	$ 21,160		$ 16,220	$ 15,394	$ 15,240		$ 15,597		$ 15,535	$ 14,853	$ 13,597	$ 68,014		$ 59,582		$ 33,487
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on sale of securities												(96)		(375)		(54)
(Increase) decrease in other assets												12,705		21,303		73,733
Increase (decrease) in other liabilities												180		(5,437)		3,137
Net cash provided by operating activities												252,625		124,683		153,286
Investing activities
Net cash received in acquisition												24,776		0		170,005
Other investing activities												0		(64)		0
Net cash used in investing activities												(247,431)		(202,802)		(57,150)
Financing activities
Cash paid for dividends												(24,557)		(21,518)		(19,303)
Excess tax benefits from exercise of stock options												537		1,102		290
Net cash provided by (used in) financing activities												44,794		(6,946)		18,092
Net increase (decrease) in cash and cash equivalents												49,988		(85,065)		114,228
Cash and cash equivalents at beginning of year					161,583						246,648	161,583		246,648		132,420
Cash and cash equivalents at end of year	211,571						161,583					211,571		161,583		246,648
Renasant Corporation
Operating activities
Net income												68,014		59,582		33,487
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on sale of securities												0		(375)		0
Equity in undistributed net income of bank subsidiary												(47,428)		(40,903)		(16,183)
Amortization/depreciation/accretion												579		385		21
(Increase) decrease in other assets												(1,377)		1,345		1,969
Increase (decrease) in other liabilities												1,088		2,591		(122)
Net cash provided by operating activities												20,876		22,625		19,172
Investing activities
Purchases of securities held to maturity and available for sale												(2,183)		(1,781)		(1,420)
Sales and maturities of securities held to maturity and available for sale												1,089		1,142		3,000
Net cash received in acquisition												5,292		0		3,917
Net cash used in investing activities												4,198		(703)		5,497
Financing activities
Cash paid for dividends												(24,557)		(21,518)		(19,303)
Cash received on exercise of stock-based compensation												102		401		276
Excess tax benefits from exercise of stock options												520		940		198
Repayments of advances from bank subsidiary												0		(1,500)		0
Net cash provided by (used in) financing activities												(23,935)		(21,677)		(18,829)
Net increase (decrease) in cash and cash equivalents												1,139		245		5,840
Cash and cash equivalents at beginning of year					$ 9,968	[1]					$ 9,723	9,968	[1]	9,723		3,883
Cash and cash equivalents at end of year	$ 11,107	[1]					$ 9,968	[1]				$ 11,107	[1]	$ 9,968	[1]	$ 9,723

[1] Eliminates in consolidation, except for $1,970 which is pledged as collateral and held at a non-subsidiary bank.