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Allowance for Credit Losses - Narrative (Details) - USD ($) $ in Thousands | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Forecast period to estimate expected credit losses | 4 years |  |  |  |  |
Term to estimate expected credit losses determined by macroeconomics variable | 3 years |  |  |  |  |
Additional term to estimated expected credit losses determined by microeconomics variable diminishing | 1 year |  |  |  |  |
Measurement period of historical losses, pro rata period | 1 year |  |  |  |  |
Allowance for loan and lease losses | $ 988,102 | $ 537,881 | $ 200,307 | $ 193,149 | $ 192,749 | $ 180,424
Consumer real estate | Commercial, Financial, and Industrial (a) |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Weighted average life | 3 years |  |  |  |  |
HELOC and R/E Installment Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Weighted average life | 5 years |  |  |  |  |
COVID-19 Deferrals |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses | $ 1,100 |  |  |  |  |

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