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Estimated Fair Values (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Estimated Fair Values [Line Items] |  |
Total investment securities available for sale, fair value | $ 5,648,094 | $ 5,387,703
Liability transfers between Level 1 and Level 2 | 0 |
Asset transfers between Level 1 and Level 2 | 0 |
Liability transfers between Level 2 and Level 1 | 0 |
Asset transfers between Level 2 and Level 1 | 0 |
Fair Value, Measurements, Nonrecurring |  |
Estimated Fair Values [Line Items] |  |
Liability measured at fair value on nonrecurring basis | $ 0 | $ 0
Minimum |  |
Estimated Fair Values [Line Items] |  |
Discounts for collateral value estimates due to estimated holding and selling costs (percent) | 10.00% | 10.00%
Maximum |  |
Estimated Fair Values [Line Items] |  |
Discounts for collateral value estimates due to estimated holding and selling costs (percent) | 14.00% | 14.00%

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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=28360136&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=27724398&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=6871852&loc=d3e26610-111562 + Details
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