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Loans And Allowance For Loan Losses - Narrative (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) contract | Dec. 31, 2020 USD ($) contract | Dec. 31, 2019 USD ($) contract | Jan. 01, 2020 USD ($) | Dec. 31, 2018 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and leases receivable, impaired, interest lost on nonaccrual loans | $ 11,100 | $ 12,600 |  |  |
Loans and leases receivable, impaired, interest income recognized, change in present value attributable to passage of time | 1,800 | 3,900 |  |  |
Loans pledged as collateral | 14,190,000 | 15,050,000 |  |  |
Loans | 39,311,958 | 38,252,984 |  |  |
Financing receivable, change in method, credit loss expense (reversal) |  | 18,300 |  |  |
Transfers to held for sale |  | 1,430,000 |  |  |
Financing receivable, allowance for credit loss | 427,597 | 605,736 | $ 281,402 | $ 281,402 | $ 250,555
Reserve for unfunded commitments | 41,900 |  |  | 1,375 |
Allowance for credit losses | 469,500 | 653,500 |  | $ 282,777 |
Allowance for credit loss, decrease | $ 184,000 |  |  |  |
ACL to loans ratio | 1.19% |  |  |  |
Decrease in ACL to loans ratio | 0.0052 |  |  |  |
Estimated unemployment rate | 3.70% |  |  |  |
Downside bias | 43.00% |  |  |  |
Financing receivable, allowance for credit loss, period increase (decrease) from increase in size of loan profile | $ 1,620,000 |  |  |  |
Financing receivable, purchase | $ 38,600 |  |  |  |
Allowance for credit loss, reasonable and supportable forecast period | 2 years |  |  |  |
Allowance for credit loss, straight-line basis historical period | 1 year |  |  |  |
Modifications, post-modification recorded investment | $ 48,932 | 76,615 | $ 49,859 |  |
Unfunded Loan Commitment |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing receivable, allowance for credit loss |  | $ 47,800 |  |  |
Troubled Debt Restructuring That Subsequently Defaulted |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Subsequent default, number of contracts | contract | 8,000 | 7 | 4 |  |
Modifications, post-modification recorded investment | $ 978 | $ 21,700 | $ 326 |  |
Commercial and industrial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans | 19,561,161 | 19,520,168 |  |  |
Modifications, post-modification recorded investment | 27,618 | 28,917 | $ 28,793 |  |
Commercial and industrial | Small Business Administration (SBA), CARES Act, Paycheck Protection Program |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans | $ 399,600 | $ 2,190,000 |  |  |

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