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Loans and Allowance for Credit Losses - Nonperforming Assets (Details) - USD ($) $ in Thousands		Mar. 31, 2025	Dec. 31, 2024
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		$ 20,909,913	$ 21,057,616
Other real estate owned		$ 8,012	$ 5,701
Nonperforming assets to total loans and other real estate		0.37%	0.37%
Nonperforming assets to total loans, excluding Warehouse Purchase Program loans, and other real estate		0.39%	0.39%
Nonaccrual loans to total loans		0.33%	0.33%
Nonaccrual loans to total loans, excluding Warehouse Purchase Program loans		0.35%	0.35%
Nonperforming Financial Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		$ 73,378	$ 75,836
Repossessed assets		29	4
Other real estate owned		8,012	5,701
Total nonperforming assets		81,419	81,541
Nonperforming Financial Loans [Member] | Finance Receivable Nonaccrual Status [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment	[1]	73,287	73,647
Nonperforming Financial Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment		$ 91	$ 2,189
[1] There were no nonperforming Warehouse Purchase Program loans or Warehouse Purchase Program lines of credit for the periods presented.

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