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Loans and Allowance for Credit Losses - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Jul. 01, 2024 | Dec. 31, 2023 | Jul. 01, 2023 | Dec. 31, 2022
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Percentage of Loans Related to Single Industry on Loans | 10.00% |  | 10.00% |  |  | 10.00% |  |
Percentage of real estate loans aggregating to company loan portfolio, excluding Warehouse Purchase Program loans | 81.10% |  | 81.10% |  |  | 83.00% |  |
Loans and Leases Receivable, Related Parties | $ 274 |  | $ 274 |  |  | $ 292 |  | $ 547
Loans held for investment | $ 21,146,033 |  | $ 21,146,033 |  |  | $ 20,352,559 |  |
Financing Receivable Ratio of Nonperforming Loans to All Loans and Other Real Estate | 0.40% |  | 0.40% |  |  | 0.34% |  |
Loans and leases receivable, nonaccrual loans | $ 84,000 |  | $ 84,000 |  |  | $ 68,700 |  |
Financing Receivable, Allowance for Credit Losses on Loans | $ 354,400 |  | $ 354,400 |  |  | $ 332,400 |  |
Allowance for Credit Losses as Percentage of Loans | 1.58% |  | 1.58% |  |  | 1.57% |  |
Provision for credit losses |  |  | $ 7,923 | $ 11,984 |  |  |  |
Provision for credit losses | $ 0 | $ 0 | 9,066 | 18,540 |  |  |  |
Increase in allowance for credit losses for loans |  |  | $ 22,000 |  |  |  |  |
Increase in allowance for credit losses for loans, percentage |  |  | 6.60% |  |  |  |  |
Net charge-offs | 5,455 | 3,408 | $ 11,966 | 18,858 |  |  |  |
General reserve | 5,000 |  | 13,900 |  |  |  |  |
Allowance for credit losses on off-balance sheet credit exposures | 37,646 | $ 36,503 | 37,646 | $ 36,503 | $ 37,646 | $ 36,503 | $ 36,503 | $ 29,947
Commitments expected to fund | 1,850,000 |  | 1,850,000 |  |  |  |  |
Nonaccrual loans | 83,969 |  | 83,969 |  |  | 68,688 |  |
LSSB Merger [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Provision for credit losses | 7,900 |  |  |  |  |  |  |
Net charge-offs |  |  | 26,100 |  |  |  |  |
Troubled Debt Restructuring [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Allowance for credit losses on off-balance sheet credit exposures | 37,600 |  | 37,600 |  |  | 36,500 |  |
Troubled Debt Restructuring [Member] | LSSB Merger [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Provision for credit losses | 1,200 |  |  |  |  |  |  |
PCD Loans [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Net charge-offs | 1,400 |  | 3,300 |  |  |  |  |
Nonperforming Financial Instruments [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Loans held for investment | $ 89,900 |  | $ 89,900 |  |  | $ 72,700 |  |

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