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Investment Securities (Amortized Cost And Estimated Fair Value Of Investments In Debt Securities By Contractual Maturity) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
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Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Total Fair value | $ 1,219,397 | $ 1,258,139
Securities Held-to-Maturity, Amortized Cost | 284,460 | 259,833
Securities held-to-maturity, fair value | 283,155 | 256,672
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 | 219,239 |
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value | 216,992 |
Securities Held-to-Maturity, Amortized Cost | 219,239 | 188,622
Securities held-to-maturity, fair value | $ 216,992 | 184,451
Held to Maturity Securities weighted avg yield | 4.52% |
Obligations Of U.S. Treasury And Other U.S. Government Sponsored Entities [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis | $ 50,000 |
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value | $ 49,927 |
Available for Sale Securities Debt Maturities next twelve months Weighted Avg Yield | 0.96% |
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis | $ 220,000 |
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis | $ 218,494 |
Available for Sale Securities Debt Maturities two through five Weighted Avg Yield | 1.24% |
Securities Available-for-Sale, Total, Amortized cost | $ 270,000 |
Securities Available-for-Sale, Total Fair value | $ 268,421 | 267,533
Available for Sale Securities Weighted Avg Yield | 1.18% |
U.S. Government Sponsored Entities Asset-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Total, Amortized cost | $ 951,328 |
Securities Available-for-Sale, Total Fair value | $ 947,579 | 987,172
Available for Sale Securities Weighted Avg Yield | 2.10% |
Securities Held-to-Maturity, Amortized Cost | $ 65,221 | 71,211
Securities held-to-maturity, fair value | $ 66,163 | $ 72,221
Held to Maturity Securities weighted avg yield | 3.28% |

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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=73527792&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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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27198-111563 + Details
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