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Investment Securities (Schedule Of Investment Securities) (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Amortized Cost | $ 1,166,888 | $ 1,099,658
Securities Available-for-Sale, Gross Unrealized Holdings Gains | 11,818 | 16,523
Securities Available-for-Sale, Gross Unrealized Holding Losses | 49,223 | 1,727
Securities Available-for-Sale, Total Fair value | 1,129,483 | 1,114,454
Securities Held-to-Maturity, Amortized Cost | 193,997 | 401,390
Securities Held-to-Maturity, Gross Unrecognized Holding Gains | 5,959 | 9,353
Securities Held-to-Maturity, Gross Unrecognized Holding Losses | 15 | 38
Securities Held-to-Maturity, Estimated Fair Value | 199,941 | 410,705
Obligations Of U.S. Treasury And Other U.S. Government Sponsored Entities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Amortized Cost | 645,631 | 695,655
Securities Available-for-Sale, Gross Unrealized Holdings Gains | 115 | 1,352
Securities Available-for-Sale, Gross Unrealized Holding Losses | 40,001 | 1,280
Securities Available-for-Sale, Total Fair value | 605,745 | 695,727
Obligations Of States And Political Subdivisions [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Amortized Cost | 220 | 984
Securities Available-for-Sale, Gross Unrealized Holdings Gains | 1 | 19
Securities Available-for-Sale, Gross Unrealized Holding Losses |  |
Securities Available-for-Sale, Total Fair value | 221 | 1,003
Securities Held-to-Maturity, Amortized Cost | 240 | 570
Securities Held-to-Maturity, Gross Unrecognized Holding Gains | 1 | 2
Securities Held-to-Maturity, Gross Unrecognized Holding Losses |  |
Securities Held-to-Maturity, Estimated Fair Value | 241 | 572
U.S. Government Sponsored Entities Asset-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Amortized Cost | 519,917 | 401,882
Securities Available-for-Sale, Gross Unrealized Holdings Gains | 10,330 | 14,067
Securities Available-for-Sale, Gross Unrealized Holding Losses | 9,222 | 447
Securities Available-for-Sale, Total Fair value | 521,025 | 415,502
Securities Held-to-Maturity, Amortized Cost | 193,757 | 400,820
Securities Held-to-Maturity, Gross Unrecognized Holding Gains | 5,958 | 9,351
Securities Held-to-Maturity, Gross Unrecognized Holding Losses | 15 | 38
Securities Held-to-Maturity, Estimated Fair Value | 199,700 | 410,133
Other Equity Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Amortized Cost | 1,120 | 1,137
Securities Available-for-Sale, Gross Unrealized Holdings Gains | 1,372 | 1,085
Securities Available-for-Sale, Gross Unrealized Holding Losses |  |
Securities Available-for-Sale, Total Fair value | $ 2,492 | $ 2,222

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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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- Definition This item represents the cost of debt and equity 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 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 of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities. + 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 (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities. + 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 (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.6) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Fair value of investments in debt securities classified as held-to-maturity. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -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 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 + Details
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