Renasant Corporation (Parent Company Only) Condensed Financial Information - Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating activities
Net income	$ 195,457	$ 144,678	$ 166,068
Adjustments to reconcile net income to net cash provided by operating activities:
Increase (decrease) in other assets	(15,014)	(51,986)	(29,671)
Increase in other liabilities	(7,854)	23,998	(6,279)
Net cash provided by operating activities	129,426	148,553	574,045
Investing activities
Net cash used in investing activities	(298,041)	(55,399)	(2,043,657)
Financing activities
Cash paid for dividends	(53,727)	(50,279)	(49,991)
Repayment of long-term debt	(245)	(2,680)	(32,417)
Proceeds from equity offering	217,000	0	0
Net cash provided by financing activities	459,296	132,205	167,639
Net increase (decrease) in cash and cash equivalents	290,681	225,359	(1,301,973)
Cash and cash equivalents at beginning of year	801,351	575,992	1,877,965
Cash and cash equivalents at end of year	1,092,032	801,351	575,992
Renasant Corporation
Operating activities
Net income	195,457	144,678	166,068
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed net income of bank subsidiary	(141,813)	(94,396)	(115,763)
Amortization/depreciation	1,425	1,770	1,478
Increase (decrease) in other assets	6,540	(8,824)	284
Increase in other liabilities	11,303	8,921	9,225
Net cash provided by operating activities	72,912	52,149	61,292
Investing activities
Sales and maturities of securities and available for sale	0	0	2,000
Net cash used in investing activities	0	0	2,000
Financing activities
Cash paid for dividends	(53,727)	(50,279)	(49,991)
Repayment of long-term debt	0	0	(30,000)
Proceeds from equity offering	217,000	0	0
Net cash provided by financing activities	163,273	(50,279)	(79,991)
Net increase (decrease) in cash and cash equivalents	236,185	1,870	(16,699)
Cash and cash equivalents at beginning of year	169,597	167,727	184,426
Cash and cash equivalents at end of year	$ 405,782	$ 169,597	$ 167,727