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Investment Securities (Schedule Of Investment Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Schedule of Investments [Line Items] |  |
Securities available-for-sale, amortized cost | $ 1,079,745 | $ 1,097,645
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 880 | 4,645
Securities Available-for-Sale, Gross Unrealized Holding Losses | 33,715 | 10,409
Securities Available-for-Sale, Total Fair value | 1,046,910 | 1,091,881
Securities Held-to-Maturity, Amortized Cost | 347,622 | 357,197
Securities Held-to-Maturity, Gross Unrecognized Holding Gains | 3,109 | 7,333
Securities Held-to-Maturity, Gross Unrecognized Holding Losses | 4,532 | 751
Securities Held-to-Maturity, Estimated Fair Value | 346,199 | 363,779
Obligations Of U.S. Treasury And Other U.S. Government Sponsored Entities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities available-for-sale, amortized cost |  | 245,000
Securities Available-for-Sale, Gross Unrealized Holding Losses |  | 2,280
Securities Available-for-Sale, Total Fair value |  | 242,720
U.S. Government Sponsored Entities Asset-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities available-for-sale, amortized cost | 1,079,745 | 852,645
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 880 | 4,645
Securities Available-for-Sale, Gross Unrealized Holding Losses | 33,715 | 8,129
Securities Available-for-Sale, Total Fair value | 1,046,910 | 849,161
Securities Held-to-Maturity, Amortized Cost | 47,767 | 56,785
Securities Held-to-Maturity, Gross Unrecognized Holding Gains | 18 | 758
Securities Held-to-Maturity, Gross Unrecognized Holding Losses | 1,246 | 38
Securities Held-to-Maturity, Estimated Fair Value | 46,539 | 57,505
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Held-to-Maturity, Amortized Cost | 299,855 | 300,412
Securities Held-to-Maturity, Gross Unrecognized Holding Gains | 3,091 | 6,575
Securities Held-to-Maturity, Gross Unrecognized Holding Losses | 3,286 | 713
Securities Held-to-Maturity, Estimated Fair Value | $ 299,660 | $ 306,274

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + 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=82897076&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + 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=82897076&loc=d3e27161-111563 + Details
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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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- 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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