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Estimated Fair Values (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investment securities available for sale | $ 4,783,507 |  | $ 4,783,507 |  | $ 7,180,180
Liability transfers between Level 1 and Level 2 | 0 |  | 0 |  | 0
Asset transfers between Level 1 and Level 2 | 0 |  | 0 |  | 0
Liability transfers between Level 2 and Level 1 | 0 |  | 0 |  | 0
Asset transfers between Level 2 and Level 1 | 0 |  | 0 |  | 0
Gains (Losses) from fair value changes on originated loans held for sale | 700 | $ 291 | 245 | $ 3,452 |
Fair Value, Measurements, Nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Liability measured at fair value on nonrecurring basis | $ 0 |  | $ 0 |  | $ 0
Minimum |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Discounts for collateral value estimates due to estimated holding and selling costs (percent) | 6.00% |  | 6.00% |  | 6.00%
Maximum |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Discounts for collateral value estimates due to estimated holding and selling costs (percent) | 11.00% |  | 11.00% |  | 11.00%
Corporate bonds |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3 |  |  | $ 59,700 |  |
Other |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3 |  |  | $ 5,600 |  |

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