Renasant Corporation (Parent Company Only) Condensed Financial Information - Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets
Cash and cash equivalents	$ 633,203	$ 414,930
Accrued interest receivable on bank balances	56,459	33,679
Other assets	207,785	165,527
Total assets	14,929,612	13,400,618	$ 12,934,878
Liabilities and shareholders’ equity
Other liabilities	241,488	196,163
Shareholders’ equity	2,132,733	2,125,689	2,043,913	$ 1,514,983
Total liabilities and shareholders’ equity	14,929,612	13,400,618
Cash collateral		844	$ 3,840
Renasant Corporation
Assets
Cash and cash equivalents	129,164	29,467
Investments	7,174	1,653
Investment in bank subsidiary	2,306,937	2,302,499
Accrued interest receivable on bank balances	6	6
Intercompany receivable	184	0
Other assets	22,926	22,861
Total assets	2,466,391	2,356,486
Liabilities and shareholders’ equity
Junior subordinated debentures	110,794	110,215
Subordinated notes	212,009	113,955
Other liabilities	10,855	6,627
Shareholders’ equity	2,132,733	2,125,689
Total liabilities and shareholders’ equity	$ 2,466,391	$ 2,356,486