Renasant Corporation (Parent Company Only) Condensed Financial Information - Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating activities
Net income	$ 144,678	$ 166,068	$ 175,892
Adjustments to reconcile net income to net cash provided by operating activities:
(Decrease) increase in other assets	(51,986)	(29,671)	(20,812)
Increase in other liabilities	23,998	(6,279)	(42,420)
Net cash provided by operating activities	148,553	574,045	142,659
Investing activities
Other investing activities	1,844	3,127	3,663
Net cash used in investing activities	(55,399)	(2,043,657)	(660,003)
Financing activities
Cash paid for dividends	(50,279)	(49,991)	(50,017)
Repurchase of shares in connection with stock repurchase program	0	0	(21,315)
Repayment of long-term debt	(2,680)	(32,417)	(202,873)
Proceeds from issuance of long-term debt	0	0	197,061
Net cash provided by financing activities	132,205	167,639	1,762,106
Net increase (decrease) in cash and cash equivalents	225,359	(1,301,973)	1,244,762
Cash and cash equivalents at beginning of year	575,992	1,877,965	633,203
Cash and cash equivalents at end of year	801,351	575,992	1,877,965
Renasant Corporation
Operating activities
Net income	144,678	166,068	175,892
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed net income of bank subsidiary	(94,396)	(115,763)	(108,674)
Amortization/depreciation	1,770	1,478	891
(Decrease) increase in other assets	(8,824)	284	(5,628)
Increase in other liabilities	8,921	9,225	6,952
Net cash provided by operating activities	52,149	61,292	69,433
Investing activities
Sales and maturities of securities and available for sale	0	2,000	5,100
Other investing activities	0	0	(100,000)
Net cash used in investing activities	0	2,000	(94,900)
Financing activities
Cash paid for dividends	(50,279)	(49,991)	(50,017)
Repurchase of shares in connection with stock repurchase program	0	0	(21,315)
Repayment of long-term debt	0	(30,000)	(45,000)
Proceeds from issuance of long-term debt	0	0	197,061
Net cash provided by financing activities	(50,279)	(79,991)	80,729
Net increase (decrease) in cash and cash equivalents	1,870	(16,699)	55,262
Cash and cash equivalents at beginning of year	167,727	184,426	129,164
Cash and cash equivalents at end of year	$ 169,597	$ 167,727	$ 184,426