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Commitments and Contingencies (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Allowance for loan losses | $ 407,837,000 | $ 516,708,000 | $ 407,837,000 | $ 516,708,000 | $ 414,956,000 | $ 427,597,000 | $ 563,214,000 | $ 605,736,000
Carrying amount included in other assets | 471,264,000 |  | 471,264,000 |  |  | 438,322,000 |  |
Amount of future funding commitments | 255,031,000 |  | 255,031,000 |  |  | 250,733,000 |  |
Permanent and short-term construction loans and letter of credit commitments | 164,957,000 |  | 164,957,000 |  |  | 204,391,000 |  |
Funded portion of permanent and short-term loans and letters of credit | 159,721,000 |  | 159,721,000 |  |  | 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 | 16,934,388,000 |  | 16,934,388,000 |  |  | 16,256,231,000 |  |
Maximum potential exposure for sponsored transactions | 31,000,000,000 | $ 28,890,000,000 | 59,600,000,000 | $ 55,150,000,000 |  |  |  |
Letters of credit |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Total letters of credit and unfunded lending commitments | 202,904,000 |  | 202,904,000 |  |  | 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 | 9,794,706,000 |  | 9,794,706,000 |  |  | 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 | 3,829,403,000 |  | 3,829,403,000 |  |  | 3,593,171,000 |  |
Commitments under home equity lines of credit |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Total letters of credit and unfunded lending commitments | 1,951,166,000 |  | 1,951,166,000 |  |  | 1,805,869,000 |  |
Unused credit card lines |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Total letters of credit and unfunded lending commitments | 475,843,000 |  | 475,843,000 |  |  | 473,582,000 |  |
Other loan commitments |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Total letters of credit and unfunded lending commitments | 680,366,000 |  | 680,366,000 |  |  | 604,353,000 |  |
Permanent and short-term construction loans and letter of credit commitments |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Contractual amount net of risk participations | 3,700,000 |  | 3,700,000 |  |  | 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 | 4,100,000 |  | 4,100,000 |  |  | 3,000,000 |  |
Unfunded Loan Commitment |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Allowance for loan losses | $ 50,600,000 |  | $ 50,600,000 |  |  | $ 41,900,000 |  |

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