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Commitments and Contingencies - Loss Commitments and Letters of Credit (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Loss Contingencies [Line Items] |  |
Carrying amount included in other assets | $ 508,575 | $ 488,944
Amount of future funding commitments | 303,388 | 283,212
Permanent and short-term construction loans and letter of credit commitments | 207,249 | 177,998
Funded portion of permanent and short-term loans and letters of credit | 242,676 | 234,166
Guarantee obligations |  |
Loss Contingencies [Line Items] |  |
Total letters of credit and unfunded lending commitments | 16,649,944 | 17,181,946
Letters of credit |  |
Loss Contingencies [Line Items] |  |
Total letters of credit and unfunded lending commitments | 232,955 | 220,622
Contractual amount net of risk participations | 25,700 | 25,700
Commitments to fund commercial and industrial loans |  |
Loss Contingencies [Line Items] |  |
Total letters of credit and unfunded lending commitments | 9,504,608 | 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 | 3,543,525 | 3,629,531
Commitments under home equity lines of credit |  |
Loss Contingencies [Line Items] |  |
Total letters of credit and unfunded lending commitments | 2,190,048 | 2,156,641
Unused credit card lines |  |
Loss Contingencies [Line Items] |  |
Total letters of credit and unfunded lending commitments | 467,520 | 461,443
Other loan commitments |  |
Loss Contingencies [Line Items] |  |
Total letters of credit and unfunded lending commitments | 711,288 | 742,976
Permanent and short-term construction loans and letter of credit commitments |  |
Loss Contingencies [Line Items] |  |
Contractual amount net of risk participations | 4,000 | 4,700
Funded portion of permanent and short-term loans and letters of credit |  |
Loss Contingencies [Line Items] |  |
Contractual amount net of risk participations | $ 5,100 | $ 6,900

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