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Loans and Allowance for Credit Losses - Nonperforming Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Accounts Notes And Loans Receivable [Line Items]    
Loans held for investment $ 20,393,943 $ 20,352,559
Other real estate owned $ 2,204 $ 1,708
Nonperforming assets to total loans and other real estate 0.39% 0.34%
Nonperforming assets to total loans, excluding Warehouse Purchase Program loans, and other real estate 0.41% 0.36%
Nonaccrual loans to total loans 0.37% 0.32%
Nonaccrual loans to total loans, excluding Warehouse Purchase Program loans 0.38% 0.34%
Nonperforming Financial Loans [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Loans held for investment $ 81,510 $ 70,883
Repossessed assets 97 76
Other real estate owned 2,204 1,708
Total nonperforming assets 83,811 72,667
Nonperforming Financial Loans [Member] | Finance Receivable Nonaccrual Status [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Loans held for investment [1],[2] 78,475 68,688
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 $ 3,035 $ 2,195
[1] ASU 2022-02 became effective for the Company on January 1, 2023.
[2] There were no nonperforming Warehouse Purchase Program loans or Warehouse Purchase Program lines of credit for the periods presented.