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Commitments and Contingencies (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Jun. 30, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Dec. 31, 2020
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Allowance for loan losses | $ 421,359,000 | $ 492,243,000 | $ 421,359,000 | $ 492,243,000 | $ 407,837,000 | $ 427,597,000 | $ 516,708,000 | $ 605,736,000
Carrying amount included in other assets | 465,361,000 |  | 465,361,000 |  |  | 426,137,000 |  |
Amount of future funding commitments | 265,209,000 |  | 265,209,000 |  |  | 250,733,000 |  |
Permanent and short-term construction loans and letter of credit commitments | 164,863,000 |  | 164,863,000 |  |  | 204,391,000 |  |
Funded portion of permanent and short-term loans and letters of credit | 202,392,000 |  | 202,392,000 |  |  | 104,315,000 |  |
Minimum |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Total letters of credit and unfunded lending commitments | 0 |  | 0 |  |  |  |  |
Maximum |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Total letters of credit and unfunded lending commitments | 5,000,000 |  | 5,000,000 |  |  |  |  |
Guarantee obligations |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Total letters of credit and unfunded lending commitments | 17,137,648,000 |  | 17,137,648,000 |  |  | 16,256,231,000 |  |
Maximum potential exposure for sponsored transactions | 30,330,000,000 | $ 28,390,000,000 | 89,940,000,000 | $ 83,540,000,000 |  |  |  |
Letters of credit |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Total letters of credit and unfunded lending commitments | 215,645,000 |  | 215,645,000 |  |  | 183,463,000 |  |
Contractual amount net of risk participations | 26,100,000 |  | 26,100,000 |  |  | 26,100,000 |  |
Commitments to fund commercial and industrial loans |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Total letters of credit and unfunded lending commitments | 9,869,096,000 |  | 9,869,096,000 |  |  | 9,595,793,000 |  |
Commitments to fund commercial real estate, construction, and land development loans |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Total letters of credit and unfunded lending commitments | 3,741,186,000 |  | 3,741,186,000 |  |  | 3,593,171,000 |  |
Commitments under home equity lines of credit |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Total letters of credit and unfunded lending commitments | 2,092,533,000 |  | 2,092,533,000 |  |  | 1,805,869,000 |  |
Unused credit card lines |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Total letters of credit and unfunded lending commitments | 463,253,000 |  | 463,253,000 |  |  | 473,582,000 |  |
Other loan commitments |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Total letters of credit and unfunded lending commitments | 755,935,000 |  | 755,935,000 |  |  | 604,353,000 |  |
Permanent and short-term construction loans and letter of credit commitments |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Contractual amount net of risk participations | 1,700,000 |  | 1,700,000 |  |  | 6,000,000 |  |
Funded portion of permanent and short-term loans and letters of credit |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Contractual amount net of risk participations | 5,700,000 |  | 5,700,000 |  |  | 3,000,000 |  |
Unfunded Loan Commitment |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Allowance for loan losses | $ 57,900,000 |  | $ 57,900,000 |  |  | $ 41,900,000 |  |

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