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Basis of Presentation and Accounting Policies (Narrative) (Details) numberOfIndividuals in Thousands, numberOfCustomers in Thousands, $ in Thousands |  | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 01, 2020 USD ($) | Sep. 30, 2020 USD ($) branch ATM numberOfCustomers numberOfIndividuals | Sep. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
Accounting Policies [Abstract] |  |  |  |  |  |  |  |
Number of branches | branch |  | 292 |  |  |  |  |  |
Number of ATMs | ATM |  | 389 |  |  |  |  |  |
PPP funded amount |  | $ 2,900,000 |  |  |  |  |  |
PPP number of customers | numberOfCustomers |  | 19 |  |  |  |  |  |
PPP average loan amount |  | $ 150 |  |  |  |  |  |
PPP individuals employed by customers | numberOfIndividuals |  | 335 |  |  |  |  |  |
Life of loans |  | 1 year |  |  |  |  |  |
Revert period |  | 1 year |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member | us-gaap:AccountingStandardsUpdate201613Member | us-gaap:AccountingStandardsUpdate201602Member |  |  |  |  |
Stockholders' equity |  | $ 5,064,542 | $ 4,868,838 | $ 5,052,968 | $ 4,941,690 |  | $ 4,753,816 | $ 3,133,602
Life of loans |  | 1 year |  |  |  |  |  |
Revert period |  | 1 year |  |  |  |  |  |
Unfunded Loan Commitment |  |  |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |
Cost basis of loans | $ 62,200 |  |  |  |  |  |  |
Impact from Adoption |  |  |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  | $ (35,721) | [1] |  | $ 4,270
Impact from Adoption | Unfunded Loan Commitment |  |  |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |
Stockholders' equity | $ 35,700 |  |  |  |  |  |  |
[1] | For additional information, see "Part I - Item 1. Financial Statements and Supplementary Data - Note 1 - Basis of Presentation" in this Report.

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