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Commitments and Contingencies - Small Business Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Loss Contingencies [Line Items] |  |
Carrying amount included in other assets | $ 426,137 | $ 262,855
Amount of future funding commitments | 250,733 | 133,946
Permanent and short-term construction loans and letter of credit commitments | 204,391 | 82,786
Funded portion of permanent and short-term loans and letters of credit | 104,315 | 9,528
Letters of credit |  |
Loss Contingencies [Line Items] |  |
Total letters of credit and unfunded lending commitments | 183,463 | 190,562
Amounts participated | 26,000 | 30,000
Commitments to fund commercial and industrial loans |  |
Loss Contingencies [Line Items] |  |
Total letters of credit and unfunded lending commitments | 9,069,588 | 8,200,608
Commitments to fund commercial real estate, construction, and land development loans |  |
Loss Contingencies [Line Items] |  |
Total letters of credit and unfunded lending commitments | 3,593,171 | 3,290,041
Commitments under home equity lines of credit |  |
Loss Contingencies [Line Items] |  |
Total letters of credit and unfunded lending commitments | 1,805,869 | 1,602,831
Unused credit card lines |  |
Loss Contingencies [Line Items] |  |
Total letters of credit and unfunded lending commitments | 999,787 | 1,012,313
Other loan commitments |  |
Loss Contingencies [Line Items] |  |
Total letters of credit and unfunded lending commitments | 604,353 | 472,233
Guarantee Obligations |  |
Loss Contingencies [Line Items] |  |
Total letters of credit and unfunded lending commitments | 16,256,231 | 14,768,588
Permanent and Short-term Construction Loans and Letter of Credit Commitments |  |
Loss Contingencies [Line Items] |  |
Amounts participated | 3,000 | 1,800
Funded Portion of Permanent and Short-term Loans and Letters of Credit |  |
Loss Contingencies [Line Items] |  |
Amounts participated | $ 3,000 | $ 234

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