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Estimated Fair Values (Narrative) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available for sale | $ 7,180,180 | $ 7,006,580
Fair value of investment securities with nonobservable inputs | 0 | 0
Asset transfers between Level 1 and Level 2 | 0 |
Asset transfers between Level 2 and Level 1 | 0 |
Liability transfers between Level 1 and Level 2 | 0 |
Liability transfers between Level 2 and Level 1 | 0 |
Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available for sale | 7,180,180 | 7,006,580
Liability measured at fair value on nonrecurring basis | 0 | 0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available for sale | $ 0 | $ 0
Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Effective Interest Rate For Discounted Cash Flow | 2.00% | 2.00%
Discounts for collateral value estimates due to estimated holding and selling costs (percent) | 6.00% | 6.00%
Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Effective Interest Rate For Discounted Cash Flow | 18.00% | 18.00%
Discounts for collateral value estimates due to estimated holding and selling costs (percent) | 11.00% | 11.00%

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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