Renasant Corporation (Parent Company Only) Condensed Financial Information - Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating activities
Net income	$ 166,068	$ 175,892	$ 83,651
Adjustments to reconcile net income to net cash provided by operating activities:
Increase (decrease) in other assets	(29,671)	(20,812)	(59,224)
Increase in other liabilities	(6,196)	(42,920)	27,077
Net cash provided by operating activities	574,045	142,659	82,242
Investing activities
Purchases of securities available for sale	(713,096)	(2,107,934)	(515,657)
Other, net	3,127	3,663	1,446
Net cash used in investing activities	(2,043,657)	(660,003)	(1,265,548)
Financing activities
Cash paid for dividends	(49,991)	(50,017)	(50,134)
Repurchase of shares in connection with stock repurchase program	0	(21,315)	(24,569)
Repayment of long-term debt	(32,417)	(202,873)	(171)
Proceeds from long-term debt	0	197,061	98,266
Net cash provided by financing activities	167,639	1,762,106	1,401,579
Net (decrease) increase in cash and cash equivalents	(1,301,973)	1,244,762	218,273
Cash and cash equivalents at beginning of year	1,877,965	633,203	414,930
Cash and cash equivalents at end of year	575,992	1,877,965	633,203
Renasant Corporation
Operating activities
Net income	166,068	175,892	83,651
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed net income of bank subsidiary	(115,763)	(108,674)	(13,322)
Amortization/depreciation	1,478	891	692
Increase (decrease) in other assets	284	(5,628)	(256)
Increase in other liabilities	9,225	6,952	10,932
Net cash provided by operating activities	61,292	69,433	81,697
Investing activities
Purchases of securities available for sale	0	0	(6,104)
Sales and maturities of securities and available for sale	2,000	5,100	541
Other, net	0	(100,000)	0
Net cash used in investing activities	2,000	(94,900)	(5,563)
Financing activities
Cash paid for dividends	(49,991)	(50,017)	(50,134)
Repurchase of shares in connection with stock repurchase program	0	(21,315)	(24,569)
Repayment of long-term debt	(30,000)	(45,000)	0
Proceeds from long-term debt	0	197,061	98,266
Net cash provided by financing activities	(79,991)	80,729	23,563
Net (decrease) increase in cash and cash equivalents	(16,699)	55,262	99,697
Cash and cash equivalents at beginning of year	184,426	129,164	29,467
Cash and cash equivalents at end of year	$ 167,727	$ 184,426	$ 129,164