Renasant Corporation (Parent Company Only) Condensed Financial Information - Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Assets
Cash and cash equivalents	$ 1,877,965	$ 633,203
Accrued interest receivable on bank balances	41,692	56,459
Other assets	183,841	207,785
Total assets	16,810,311	14,929,612	$ 13,400,618
Liabilities and shareholders’ equity
Other liabilities	209,578	241,488
Shareholders’ equity	2,209,853	2,132,733	$ 2,125,689	$ 2,043,913
Total liabilities and shareholders’ equity	16,810,311	14,929,612
Cash collateral	1,857	844
Renasant Corporation
Assets
Cash and cash equivalents	184,426	129,164
Investments	2,009	7,174
Investment in bank subsidiary	2,477,917	2,306,937
Accrued interest receivable on bank balances	4	6
Intercompany receivable	0	184
Other assets	28,751	22,926
Total assets	2,693,107	2,466,391
Liabilities and shareholders’ equity
Junior subordinated debentures	111,373	110,794
Subordinated notes	359,419	212,009
Other liabilities	12,462	10,855
Shareholders’ equity	2,209,853	2,132,733
Total liabilities and shareholders’ equity	$ 2,693,107	$ 2,466,391