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Estimated Fair Values (Assets and Liabilities Carried at Fair Value on a Recurring Basis Significant Unobservable Inputs) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3 | $ 0 |  | $ 1,800,000 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Investment securities available for sale | 9,019,788,000 |  | 9,019,788,000 |  | $ 7,059,674,000
Corporate Bonds |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Beginning balance | 169,977,000 | $ 149,137,000 | 69,685,000 | $ 143,226,000 |
Purchases | 78,000,000 | 8,000,000 | 178,595,000 | 11,991,000 |
Amounts included in net income | 2,818,000 | 1,147,000 | 901,000 | 2,985,000 |
Unrealized net (losses) gains included in other comprehensive income | (81,000) | 41,000 | (249,000) | 123,000 |
Transfers in | 0 | 0 | 1,782,000 | 0 |
Ending balance | 250,714,000 | $ 157,325,000 | 250,714,000 | $ 157,325,000 |
Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Investment securities available for sale |  |  |  |  | 7,059,674,000
Fair Value, Measurements, Recurring | Corporate Bonds |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Investment securities available for sale |  |  |  |  | 201,566,000
Significant Unobservable Inputs (Level 3 Inputs) | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Investment securities available for sale | $ 250,714,000 |  | $ 250,714,000 |  | 69,685,000
Significant Unobservable Inputs (Level 3 Inputs) | Fair Value, Measurements, Recurring | Corporate Bonds |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Investment securities available for sale |  |  |  |  | $ 69,685,000

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- Definition Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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