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Loans and Allowance for Credit Losses - Additional Information (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Percentage of Loans Related to Single Industry on Loans | 10.00% |  | 10.00% |
Percentage of real estate loans aggregating to company loan portfolio, excluding Warehouse Purchase Program loans | 82.30% |  | 83.00% |
Loans and Leases Receivable, Related Parties | $ 290,000 |  | $ 292,000 | $ 547,000
Loans held for investment | $ 20,393,943,000 |  | $ 20,352,559,000 |
Financing Receivable Ratio of Nonperforming Loans to All Loans and Other Real Estate | 0.39% |  | 0.34% |
Loans and leases receivable, nonaccrual loans | $ 78,500,000 |  | $ 68,700,000 |
Financing Receivable, Allowance for Credit Losses on Loans | $ 330,200,000 |  | $ 332,400,000 |
Allowance for Credit Losses as Percentage of Loans | 1.55% |  | 1.57% |
Provision for credit losses | $ 0 | $ 0 |  |
Decrease in allowance for credit losses for loans | $ (2,100,000) |  |  |
Decrease in allowance for credit losses for loans, percentage | (0.60%) |  |  |
Net (charge-offs) recoveries | $ (2,143,000) | $ 615,000 |  |
General reserve | 4,100,000 |  |  |
Allowance for credit losses on off-balance sheet credit exposures | 36,503,000 |  | $ 36,503,000 |
Commitments expected to fund | 2,260,000,000 |  |  |
Nonaccrual loans | 78,475,000 |  | 68,688,000 |
PCD Loans [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Net (charge-offs) recoveries | (991,000) |  |  |
Nonperforming Financial Instruments [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Loans held for investment | $ 83,800,000 |  | $ 72,700,000 |

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