Subordinated Debentures and Trust Preferred Securities - Summary of Debentures Payable to Statutory Trusts (Details) - Subordinated Debt - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Debentures payable	$ 56,703	$ 56,703
First Bancshares of Baton Rouge Statutory Trust I
Debt Instrument [Line Items]
Basis spread on variable rate	2.50%
Debentures payable	$ 4,124	4,124
State Capital Statutory Trust IV
Debt Instrument [Line Items]
Basis spread on variable rate	1.99%
Debentures payable	$ 5,155	5,155
BancPlus Statutory Trust II
Debt Instrument [Line Items]
Basis spread on variable rate	1.50%
Debentures payable	$ 20,619	20,619
BancPlus Statutory Trust III
Debt Instrument [Line Items]
Basis spread on variable rate	1.35%
Debentures payable	$ 20,619	20,619
State Capital Master Trust
Debt Instrument [Line Items]
Basis spread on variable rate	1.46%
Debentures payable	$ 6,186	$ 6,186