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Commitments and Contingencies (Schedule of Loss Commitments and Letters of Credit) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Loss Contingencies [Line Items] |  |
Carrying amount included in other assets | $ 544,619 | $ 488,944
Amount of future funding commitments | 306,183 | 283,212
Permanent and short-term construction loans and letter of credit commitments | 199,819 | 177,998
Funded portion of permanent and short-term loans and letters of credit | 170,809 | 234,166
Guarantee obligations |  |
Loss Contingencies [Line Items] |  |
Total letters of credit and unfunded lending commitments | 16,660,498 | 17,181,946
Letters of credit |  |
Loss Contingencies [Line Items] |  |
Total letters of credit and unfunded lending commitments | 185,913 | 220,622
Contractual amount net of risk participations | 23,400 | 25,700
Commitments to fund commercial and industrial loans |  |
Loss Contingencies [Line Items] |  |
Total letters of credit and unfunded lending commitments | 10,417,395 | 9,970,733
Commitments to fund commercial real estate, construction, and land development loans |  |
Loss Contingencies [Line Items] |  |
Total letters of credit and unfunded lending commitments | 2,781,046 | 3,629,531
Commitments under home equity lines of credit |  |
Loss Contingencies [Line Items] |  |
Total letters of credit and unfunded lending commitments | 2,138,012 | 2,156,641
Unused credit card lines |  |
Loss Contingencies [Line Items] |  |
Total letters of credit and unfunded lending commitments | 461,216 | 461,443
Other loan commitments |  |
Loss Contingencies [Line Items] |  |
Total letters of credit and unfunded lending commitments | 676,916 | 742,976
Permanent and short-term construction loans and letter of credit commitments |  |
Loss Contingencies [Line Items] |  |
Contractual amount net of risk participations | 9,400 | 4,700
Funded portion of permanent and short-term loans and letters of credit |  |
Loss Contingencies [Line Items] |  |
Contractual amount net of risk participations | $ 2,000 | $ 6,900

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