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Commitments and Contingencies (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member |  |  | us-gaap:AccountingStandardsUpdate201613Member | us-gaap:AccountingStandardsUpdate201602Member |  |  |  |
Total allowance for loan losses | $ 281,402,000 | $ 588,648,000 | $ 257,376,000 | $ 588,648,000 | $ 257,376,000 | $ 493,452,000 | $ 281,402,000 | $ 257,036,000 | $ 250,555,000
Carrying amount included in other assets |  | 168,058,000 |  | 168,058,000 |  |  | 146,612,000 |  |
Amount of future funding commitments included in carrying amount |  | 92,025,000 |  | 92,025,000 |  |  | 78,266,000 |  |
Permanent and short-term construction loans and letter of credit commitments |  | 12,488,000 |  | 12,488,000 |  |  | 2,124,000 |  |
Funded portion of permanent and short-term loans and letters of credit |  | 5,146,000 |  | 5,146,000 |  |  | 3,196,000 |  |
Contractual amount net of risk participations |  | 31,000,000 |  | 31,000,000 |  |  | 33,000,000 |  |
Guarantor obligations, advanced payment from merchant |  | 20,900,000 |  | 20,900,000 |  |  | 21,400,000 |  |
Guarantor obligations, advanced payment from merchant, reserve |  |  |  |  |  | $ 2,700,000 |  |  |
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 |  | 18,200,000 |  | 18,200,000 |  |  |  |  |
Guarantee obligations |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Total letters of credit and unfunded lending commitments |  | 13,878,645,000 |  | 13,878,645,000 |  |  | 13,117,770,000 |  |
Maximum potential exposure for sponsored transactions |  | 16,400,000,000 | $ 18,880,000,000 | 34,750,000,000 | $ 36,590,000,000 |  |  |  |
Letters of credit |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Total letters of credit and unfunded lending commitments |  | 175,465,000 |  | 175,465,000 |  |  | 202,614,000 |  |
Commitments to fund commercial and industrial loans |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Total letters of credit and unfunded lending commitments |  | 7,887,720,000 |  | 7,887,720,000 |  |  | 7,018,152,000 |  |
Commitments to fund commercial real estate, construction, and land development loans |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Total letters of credit and unfunded lending commitments |  | 2,823,515,000 |  | 2,823,515,000 |  |  | 3,032,252,000 |  |
Commitments under home equity lines of credit |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Total letters of credit and unfunded lending commitments |  | 1,584,619,000 |  | 1,584,619,000 |  |  | 1,501,452,000 |  |
Unused credit card lines |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Total letters of credit and unfunded lending commitments |  | 971,419,000 |  | 971,419,000 |  |  | 877,929,000 |  |
Other loan commitments |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Total letters of credit and unfunded lending commitments |  | 435,907,000 |  | 435,907,000 |  |  | 485,371,000 |  |
Unfunded Loan Commitment |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Current expected credit losses | $ 27,400,000 |  |  |  |  |  |  |  |
Total allowance for loan losses |  | $ 61,000,000.0 |  | $ 61,000,000.0 |  |  | $ 1,400,000 |  |

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