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Investment Securities (Amortized Cost And Estimated Fair Value Of Investments In Debt Securities By Contractual Maturity) (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
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Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Total Fair value | $ 1,293,464 | $ 1,301,915
Securities Held-to-Maturity, Amortized Cost | 117,509 | 140,562
Securities held-to-maturity, fair value | 119,585 | 143,490
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount | 6,094 |
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value | 6,142 |
Securities Held-to-Maturity, Amortized Cost | 6,094 |
Securities held-to-maturity, fair value | $ 6,142 |
Held to Maturity Securities weighted avg yield | 5.03% |
Obligations Of U.S. Treasury And Other U.S. Government Sponsored Entities [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis | $ 150,000 |
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value | $ 150,257 |
Available for Sale Securities Debt Maturities two through five Weighted Avg Yield | 1.39% |
Securities Available-for-Sale, Due five through ten years, Amortized cost | $ 396,888 |
Securities Available-for-Sale, Due five through ten years, Fair value | $ 394,794 |
Available for Sale Securities Debt Maturities After Five Through Ten Years Weighted Avg Yield | 2.43% |
Securities Available-for-Sale, Total, Amortized cost | $ 546,888 |
Securities Available-for-Sale, Total Fair value | $ 545,051 | 538,064
Available for Sale Securities Weighted Avg Yield | 2.14% |
U.S. Government Sponsored Entities Asset-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Total, Amortized cost | $ 734,014 |
Securities Available-for-Sale, Total Fair value | $ 745,780 | 761,153
Available for Sale Securities Weighted Avg Yield | 2.31% |
Securities Held-to-Maturity, Amortized Cost | $ 111,415 | 140,562
Securities held-to-maturity, fair value | $ 113,443 | $ 143,490
Held to Maturity Securities weighted avg yield | 3.49% |

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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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