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Commitments and Contingencies - Small Business Loans (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Loss Contingencies [Line Items] |  |
Carry amount included in other assets | $ 570,810 | $ 573,992
Permanent and short-term construction loans and letter of credit commitments | 110,485 | 205,659
Funded portion of permanent and short-term loans and letters of credit | 220,106 | 211,921
Future funding commitment amount | 282,900 | 293,300
Letters of credit |  |
Loss Contingencies [Line Items] |  |
Total letters of credit and unfunded lending commitments | 234,653 | 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 | 10,145,073 | 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 | 1,861,467 | 2,496,656
Commitments under home equity lines of credit |  |
Loss Contingencies [Line Items] |  |
Total letters of credit and unfunded lending commitments | 2,126,553 | 2,135,120
Unused credit card lines |  |
Loss Contingencies [Line Items] |  |
Total letters of credit and unfunded lending commitments | 455,477 | 453,303
Other loan commitments |  |
Loss Contingencies [Line Items] |  |
Total letters of credit and unfunded lending commitments | 625,261 | 654,396
Total letters of credit and unfunded lending commitments |  |
Loss Contingencies [Line Items] |  |
Total letters of credit and unfunded lending commitments | 15,448,484 | 16,253,624
Permanent and short-term construction loans and letter of credit commitments |  |
Loss Contingencies [Line Items] |  |
Contractual amount net of risk participations | 6,200 | 9,700
Funded portion of permanent and short-term loans and letters of credit |  |
Loss Contingencies [Line Items] |  |
Contractual amount net of risk participations | $ 16,500 | $ 4,000

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