Acquisitions - Narrative (Details)				12 Months Ended
	Apr. 08, 2022 USD ($) shares	Nov. 20, 2021 USD ($)	Oct. 08, 2021 USD ($) branch shares	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Nov. 19, 2021 USD ($) branch
Spirit of Texas Bancshares, Inc.
Business Acquisition [Line Items]
Shares issued (in shares) | shares	18,275,074
Stock issued for acquisition	$ 464,900,000				$ 464,918,000
Payments to acquire businesses, gross	$ 1,393,508.9
Number of bank branches acquired | branch							35
Assets acquired, after acquisition method adjustments							$ 3,110,000,000
Loans acquired, after acquisition method adjustments					35,200,000		2,290,000,000
Customer deposits acquired, after acquisition method adjustments							$ 2,720,000,000
Goodwill		$ 174,146,000
Acquisition-related costs					18,700,000
Landmark Community Bank
Business Acquisition [Line Items]
Shares issued (in shares) | shares			4,499,872
Stock issued for acquisition			$ 138,200,000
Payments to acquire businesses, gross			$ 6,451,727.43
Number of bank branches acquired | branch			8
Assets acquired, after acquisition method adjustments			$ 968,800,000
Loans acquired, after acquisition method adjustments			789,500,000
Customer deposits acquired, after acquisition method adjustments			802,700,000
Goodwill			$ 31,404,000
Triumph Bancshares, Inc.
Business Acquisition [Line Items]
Shares issued (in shares) | shares			4,164,712
Stock issued for acquisition			$ 127,900,000
Payments to acquire businesses, gross			$ 1,693,402.93
Number of bank branches acquired | branch			6
Assets acquired, after acquisition method adjustments			$ 847,200,000
Loans acquired, after acquisition method adjustments			698,800,000
Customer deposits acquired, after acquisition method adjustments			719,700,000
Goodwill			$ 39,944,000
Acquisition-related costs				$ 1,400,000	$ 22,500,000	$ 15,900,000