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Commitments and Contingencies - Schedule of Loan Commitments and Letters of Credit (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Loss Contingencies [Line Items] |  |
Carry amount included in other assets | $ 596,259 | $ 573,992
Permanent and short-term construction loans and letter of credit unfunded commitments | 128,323 | 205,659
Funded portion of permanent and short-term loans and letters of credit | 238,585 | 211,921
Future funding commitment amount | 313,200 | 293,300
Letters of Credit |  |
Loss Contingencies [Line Items] |  |
Total letters of credit and unfunded lending commitments | 236,031 | 200,269
Contractual amount net of risk participations | 18,400 | 22,800
Commitments to fund commercial and industrial loans |  |
Loss Contingencies [Line Items] |  |
Total letters of credit and unfunded lending commitments | 9,880,655 | 10,313,880
Commitments to fund commercial real estate, construction, and land development loans |  |
Loss Contingencies [Line Items] |  |
Total letters of credit and unfunded lending commitments | 1,973,849 | 2,496,656
Commitments under home equity lines of credit |  |
Loss Contingencies [Line Items] |  |
Total letters of credit and unfunded lending commitments | 2,115,145 | 2,135,120
Unused credit card lines |  |
Loss Contingencies [Line Items] |  |
Total letters of credit and unfunded lending commitments | 452,273 | 453,303
Other loan commitments |  |
Loss Contingencies [Line Items] |  |
Total letters of credit and unfunded lending commitments | 635,849 | 654,396
Total letters of credit and unfunded lending commitments |  |
Loss Contingencies [Line Items] |  |
Total letters of credit and unfunded lending commitments | 15,293,802 | 16,253,624
Permanent and Short-Term Construction Loans and Letter of Credit Commitments |  |
Loss Contingencies [Line Items] |  |
Contractual amount net of risk participations | 4,400 | 9,700
Funded Portion of Permanent and Short-Term Loans and Letters of Credit |  |
Loss Contingencies [Line Items] |  |
Contractual amount net of risk participations | $ 18,200 | $ 4,000

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