Acquisitions - Textual (Details)	Nov. 19, 2021 USD ($) branch shares	Oct. 08, 2021 USD ($) branch shares	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Oct. 31, 2019 USD ($)	Oct. 30, 2019 USD ($)
Business Acquisition [Line Items]
Goodwill			$ 1,147,007,000	$ 1,146,007,000
Landmark Community Bank
Business Acquisition [Line Items]
Equity interest issued or issuable (in shares) | shares		4,499,872
Payments to acquire businesses, gross		$ 138,200,000
Stock issued for acquisition		$ 6,451,727,430
Number of bank branches acquired | branch		8
Assets acquired		$ 968,800,000			$ 968,772,000	$ 966,006,000
Loans acquired		789,500,000			789,504,000	785,551,000
Deposits acquired		802,700,000			802,671,000	803,005,000
Goodwill		$ 31,500,000			31,454,000
Triumph Bancshares, Inc.
Business Acquisition [Line Items]
Equity interest issued or issuable (in shares) | shares		4,164,712
Payments to acquire businesses, gross		$ 127,900,000
Stock issued for acquisition		$ 1,693,402,930
Number of bank branches acquired | branch		6
Assets acquired		$ 846,900,000			846,922,000	845,523,000
Loans acquired		698,800,000			698,786,000	702,460,000
Deposits acquired		719,700,000			719,734,000	$ 718,640,000
Goodwill		$ 40,200,000			$ 40,247,000
Spirit of Texas Bancshares, Inc.
Business Acquisition [Line Items]
Equity interest issued or issuable (in shares) | shares	18,275,074
Payments to acquire businesses, gross	$ 1,393,508.24
Number of bank branches acquired | branch	35
Assets acquired			3,220,000,000
Loans acquired			2,380,000,000
Deposits acquired			$ 2,740,000,000