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Estimated Fair Values (Assets and Liabilities Carried at Fair Value on a Recurring Basis Significant Unobservable Inputs) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
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 | $ 0 |  | $ 1,800 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Investment securities available for sale | 7,381,083 |  | $ 7,381,083 |  | $ 7,014,243
Corporate Bonds |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Beginning balance | 318,116 | 67,016 | 316,624 | 69,685 |
Purchases | 7,000 | 100,595 | 7,000 | 100,595 |
Unrealized net (losses) gains included in other comprehensive income | 1,340 | 2,449 | 3,491 | (1,917) |
Amounts included in net income | 92 | (83) | 183 | (168) |
Transfers in | 0 | 0 | 0 | 1,782 |
Sales / Calls | 1,100 | 0 | 1,850 | 0 |
Ending balance | 325,448 | $ 169,977 | 325,448 | $ 169,977 |
Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Investment securities available for sale |  |  |  |  | 7,014,243
Fair Value, Measurements, Recurring | Corporate Bonds |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Investment securities available for sale |  |  |  |  | 603,279
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 | $ 325,448 |  | $ 325,448 |  | 316,624
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 |  |  |  |  | $ 316,624

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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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