Acquisitions - Narrative (Details) - Spirit of Texas Bancshares, Inc.		5 Months Ended	12 Months Ended
	Nov. 20, 2021 USD ($)	Apr. 08, 2022 USD ($) shares	Dec. 31, 2022 USD ($)	Mar. 31, 2023 USD ($)	Nov. 19, 2021 USD ($) branch
Business Acquisition [Line Items]
Shares issued (in shares) | shares		18,275,074
Payments to acquire businesses, gross		$ 464,900,000
Stock issued for acquisition		$ 1,393,508,900
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 acquired	$ 174,146,000
Acquisition-related costs			$ 18,700,000