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Investments (Amortized Cost And Estimated Fair Value Of Debt Securities By Contractual Maturity) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Securities Available-for-Sale, Amortized Cost |  |
Securities Available-for-Sale, Due in one year or less, Cost | $ 2,939 |
Securities Available-for-Sale, Due after one year through five years, Cost | 12,388 |
Securities Available-for-Sale, Due after five years through ten years, Cost | 80,329 |
Securities Available-for-Sale, Due after ten years, Cost | 424,811 |
Securities Available-for-Sale, Cost, Total | 520,467 |
Securities Available-for-Sale, Estimated Fair Value |  |
Securities Available-for-Sale, Due in one year or less, Estimated Fair Value | 2,951 |
Securities Available-for-Sale, Due after one year through five years, Estimated Fair Value | 14,839 |
Securities Available-for-Sale, Due after five years through ten years, Estimated Fair Value | 77,039 |
Securities Available-for-Sale, Due after ten years, Estimated Fair Value | 424,288 |
Securities Available-for-Sale, Estimated Fair Value, Total | 519,117 |
Securities Held-to-Maturity, Amortized Cost |  |
Securities Held-to-Maturity, Due in one year or less, Cost | 0 |
Securities Held-to-Maturity, Due after one year through five years, Cost | 0 |
Securities Held-to-Maturity, Due after five years through ten years, Cost | 0 |
Securities Held-to-Maturity, Due after ten years, Cost | 66,989 |
Securities Held-to-Maturity, Amortized Cost | 66,989 | $ 75,169
Securities Held-to-Maturity, Estimated Fair Value |  |
Securities Held-to-Maturity, Due in one year or less, Estimated Fair Value | 0 |
Securities Held-to-Maturity, Due after one year through five years, Estimated Fair Value | 0 |
Securities Held-to-Maturity, Due after five years through ten years, Estimated Fair Value | 0 |
Securities Held-to-Maturity, Due after ten years, Estimated Fair Value | 68,478 |
Securities Held-to-Maturity, Estimated Fair Value | $ 68,478 | $ 76,445

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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 sixth fiscal year through the tenth 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 (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27198-111563 + 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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