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Commitments and Contingencies (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Allowance for loan losses | $ 492,243,000 | $ 603,800,000 | $ 492,243,000 | $ 603,800,000 | $ 516,708,000 | $ 605,736,000 | $ 588,648,000 | $ 281,402,000
Carrying amount included in other assets | 380,624,000 |  | 380,624,000 |  |  | 262,855,000 |  |
Amount of future funding commitments included in carrying amount | 213,791,000 |  | 213,791,000 |  |  | 133,946,000 |  |
Permanent and short-term construction loans and letter of credit commitments | 172,285,000 |  | 172,285,000 |  |  | 82,786,000 |  |
Funded portion of permanent and short-term loans and letters of credit | 69,823,000 |  | 69,823,000 |  |  | 9,528,000 |  |
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 |  |  |  |  |
Other assets held for sale |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Guarantor obligations, advanced payment from merchant | 15,300,000 |  | 15,300,000 |  |  | 15,600,000 |  |
Guarantee obligations |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Total letters of credit and unfunded lending commitments | 15,895,718,000 |  | 15,895,718,000 |  |  | 14,768,588,000 |  |
Maximum potential exposure for sponsored transactions | 28,390,000,000 | $ 20,230,000,000 | 83,540,000,000 | $ 55,540,000,000 |  |  |  |
Letters of credit |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Total letters of credit and unfunded lending commitments | 184,317,000 |  | 184,317,000 |  |  | 190,562,000 |  |
Contractual amount net of risk participations | 26,400,000 |  | 26,400,000 |  |  | 30,200,000 |  |
Commitments to fund commercial and industrial loans |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Total letters of credit and unfunded lending commitments | 8,893,056,000 |  | 8,893,056,000 |  |  | 8,200,608,000 |  |
Commitments to fund commercial real estate, construction, and land development loans |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Total letters of credit and unfunded lending commitments | 3,490,875,000 |  | 3,490,875,000 |  |  | 3,290,041,000 |  |
Commitments under home equity lines of credit |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Total letters of credit and unfunded lending commitments | 1,738,063,000 |  | 1,738,063,000 |  |  | 1,602,831,000 |  |
Unused credit card lines |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Total letters of credit and unfunded lending commitments | 1,008,471,000 |  | 1,008,471,000 |  |  | 1,012,313,000 |  |
Other loan commitments |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Total letters of credit and unfunded lending commitments | 580,936,000 |  | 580,936,000 |  |  | 472,233,000 |  |
Permanent and short-term construction loans and letter of credit commitments |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Contractual amount net of risk participations | 3,600,000 |  | 3,600,000 |  |  | 1,800,000 |  |
Funded portion of permanent and short-term loans and letters of credit |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Contractual amount net of risk participations | 2,400,000 |  | 2,400,000 |  |  | 234,000 |  |
Unfunded Loan Commitment |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Allowance for loan losses | $ 43,000,000 |  | $ 43,000,000 |  |  | $ 47,800,000 |  |

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